Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Derivative Financial Instruments - Classifications on Consolidated Balance Sheets (Details) - Designated as Hedging Instrument [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Fair Value $ 5,749,000 $ 5,345,000
Interest Rate Swap One [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 150,000,000  
Company Average Fixed Pay Rate 1.30%  
Fair Value $ 0 326,000
Interest Rate Swap Two [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 175,000,000  
Company Average Fixed Pay Rate 1.03%  
Fair Value $ 4,948,000 5,207,000
Interest Rate Swap Three [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 40,000,000  
Company Average Fixed Pay Rate 2.47%  
Fair Value $ (6,000) 0
Interest Rate Swap Four [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 150,000,000  
Company Average Fixed Pay Rate 2.20%  
Fair Value $ 807,000 $ (188,000)
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap One [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Two [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Three [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Interest Rate Term 1 month  
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Four [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Interest Rate Term 1 month