Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details)

v3.8.0.1
Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details) - Designated as Hedging Instrument [Member] - USD ($)
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional Amount $ 325,000,000  
Fair Value 4,211,000 $ 3,993,000
Interest Rate Swap One [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.3075%  
Fair Value $ 52,000 (119,000)
Interest Rate Swap Two [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.297%  
Fair Value $ 56,000 (110,000)
Interest Rate Swap Three [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.3025%  
Fair Value $ 54,000 (115,000)
Interest Rate Swap Four [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.039%  
Fair Value $ 1,147,000 1,227,000
Interest Rate Swap Five [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.0395%  
Fair Value $ 1,146,000 1,226,000
Interest Rate Swap Six [Member]    
Derivative [Line Items]    
Notional Amount $ 50,000,000  
Company Fixed Pay Rate 1.04%  
Fair Value $ 1,145,000 1,222,000
Interest Rate Swap Seven [Member]    
Derivative [Line Items]    
Notional Amount $ 25,000,000  
Company Fixed Pay Rate 0.9915%  
Fair Value $ 611,000 $ 662,000
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap One [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Two [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Three [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Four [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Five [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Six [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Seven [Member]    
Derivative [Line Items]    
Bank Pay Rate 1 month