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Derivative Instruments (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Forward Cash Flow Hedge Relationship [Abstract]    
Gain on termination of derivative contract $ 64,000  
Maximum [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Swap agreements term 10 years  
Minimum [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Swap agreements term 7 years  
Not Designated as Hedging Instrument [Member]    
Interest rate swap agreements [Abstract]    
Notional amount of interest rate swap $ 1,155,846,000 $ 792,224,000
Estimated fair value of interest rate swap $ (291,000) $ (199,000)
Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Jul. 01, 2014 Jul. 01, 2014
Higher maturity range date term Jul. 01, 2021 Jul. 01, 2021
Pay Fixed / Receive Variable Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Interest rate swap agreements [Abstract]    
Notional amount of interest rate swap $ 577,923,000 $ 396,112,000
Estimated fair value of interest rate swap 37,589,000 16,130,000
Pay Variable / Receive Fixed Swaps [Member] | Not Designated as Hedging Instrument [Member]    
Interest rate swap agreements [Abstract]    
Notional amount of interest rate swap 577,923,000 396,112,000
Estimated fair value of interest rate swap $ (37,880,000) $ (16,329,000)
Interest Rate Swap April 2016 April 2020 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Apr. 01, 2016 Apr. 01, 2016
Forecasted notional amount $ 33,000,000 $ 33,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 2.265% 2.265%
Higher maturity range date term [1] Apr. 01, 2020 Apr. 01, 2020
Interest rate derivative assets, at fair value $ (1,785,000) $ (784,000)
Unrealized gain in accumulated other comprehensive income $ (1,085,000) $ (476,000)
Interest Rate Swap April 2016 April 2022 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Apr. 01, 2016 Apr. 01, 2016
Forecasted notional amount $ 33,000,000 $ 33,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 2.646% 2.646%
Higher maturity range date term [1] Apr. 01, 2022 Apr. 01, 2022
Interest rate derivative assets, at fair value $ (3,051,000) $ (1,478,000)
Unrealized gain in accumulated other comprehensive income $ (1,854,000) $ (898,000)
Interest Rate Swap October 2016 October 2020 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Oct. 01, 2016 Oct. 01, 2016
Forecasted notional amount $ 33,000,000 $ 33,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 2.523% 2.523%
Higher maturity range date term [1] Oct. 01, 2020 Oct. 01, 2020
Interest rate derivative assets, at fair value $ (2,048,000) $ (908,000)
Unrealized gain in accumulated other comprehensive income (1,245,000) (552,000)
Interest Rate Swap July 2014 July 2021 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Forecasted notional amount $ 27,500,000 $ 27,500,000
Variable interest rate 1 month LIBOR 1 month LIBOR
Fixed interest rate 2.09% 2.09%
Interest rate derivative assets, at fair value $ 1,553,000 $ 663,000
Unrealized gain in accumulated other comprehensive income $ 944,000 $ 403,000
Interest Rate Swap July 2014 July 2022 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Jul. 01, 2014 Jul. 01, 2014
Forecasted notional amount $ 25,000,000 $ 25,000,000
Variable interest rate 1 month LIBOR 1 month LIBOR
Fixed interest rate 2.27% 2.27%
Higher maturity range date term Jul. 01, 2022 Jul. 01, 2022
Interest rate derivative assets, at fair value $ 2,178,000 $ 968,000
Unrealized gain in accumulated other comprehensive income $ 1,324,000 588,000
Interest Rate Swap July 2014 July 2023 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Jul. 01, 2014  
Forecasted notional amount $ 27,500,000 $ 27,500,000
Variable interest rate 1 month LIBOR 1 month LIBOR
Fixed interest rate 2.42% 2.42%
Higher maturity range date term Jul. 01, 2023 Jul. 01, 2023
Interest rate derivative assets, at fair value $ 2,859,000 $ 1,320,000
Unrealized gain in accumulated other comprehensive income 1,737,000 802,000
Interest Rate Swap July 2014 July 2024 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Forecasted notional amount $ 30,000,000 $ 30,000,000
Variable interest rate 1 month LIBOR 1 month LIBOR
Fixed interest rate 2.50% 2.50%
Higher maturity range date term Jul. 01, 2024 Jul. 01, 2024
Interest rate derivative assets, at fair value $ 2,964,000 $ 1,333,000
Unrealized gain in accumulated other comprehensive income $ 1,801,000 $ 810,000
Interest Rate Swap October 2017 October 2021 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Oct. 01, 2017 Oct. 01, 2017
Forecasted notional amount $ 33,000,000 $ 33,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 2.992% 2.992%
Higher maturity range date term [1] Oct. 01, 2021 Oct. 01, 2021
Interest rate derivative assets, at fair value $ (2,466,000) $ (1,112,000)
Unrealized gain in accumulated other comprehensive income $ (1,499,000) $ (676,000)
Interest Rate Swap April 2018 July 2022 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Apr. 01, 2018 Apr. 01, 2018
Forecasted notional amount $ 34,000,000 $ 34,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 3.118% 3.118%
Higher maturity range date term [1] Jul. 01, 2022 Jul. 01, 2022
Interest rate derivative assets, at fair value $ (2,626,000) $ (1,170,000)
Unrealized gain in accumulated other comprehensive income $ (1,596,000) $ (711,000)
Interest Rate Swap July 2018 October 2022 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term [1] Jul. 01, 2018 Jul. 01, 2018
Forecasted notional amount $ 34,000,000 $ 34,000,000
Variable interest rate 3 month LIBOR 3 month LIBOR
Fixed interest rate 3.158% 3.158%
Higher maturity range date term [1] Oct. 01, 2022 Oct. 01, 2022
Interest rate derivative assets, at fair value $ (2,611,000) $ (1,158,000)
Unrealized gain in accumulated other comprehensive income $ (1,587,000) $ (704,000)
Interest Rate Swap August 2015 - August 2018 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Aug. 01, 2015 Aug. 01, 2015
Forecasted notional amount $ 0 $ 15,000,000
Variable interest rate 1 month LIBOR 1 month LIBOR
Fixed interest rate 1.048% 1.048%
Higher maturity range date term Aug. 01, 2018 Aug. 01, 2018
Interest rate derivative assets, at fair value $ 0 $ (46,000)
Unrealized gain in accumulated other comprehensive income $ 0 $ (28,000)
Interest Rate Swap August 2015 - August 2019 [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term   Aug. 01, 2015
Forecasted notional amount   $ 15,000,000
Variable interest rate   1 month LIBOR
Fixed interest rate   1.281%
Higher maturity range date term   Aug. 01, 2019
Interest rate derivative assets, at fair value   $ (34,000)
Unrealized gain in accumulated other comprehensive income   $ (21,000)
Interest Rate Swap August 2015 - August 2019 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Aug. 01, 2015  
Forecasted notional amount $ 0  
Variable interest rate 1 month LIBOR  
Fixed interest rate 1.281%  
Higher maturity range date term Aug. 01, 2019  
Interest rate derivative assets, at fair value $ 0  
Unrealized gain in accumulated other comprehensive income $ 0  
Interest Rate Swap August 2015 - August 2020 [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term   Aug. 01, 2015
Forecasted notional amount   $ 15,000,000
Variable interest rate   1 month LIBOR
Fixed interest rate   1.47%
Higher maturity range date term   Aug. 01, 2020
Interest rate derivative assets, at fair value   $ (14,000)
Unrealized gain in accumulated other comprehensive income   $ (9,000)
Interest Rate Swap August 2015 - August 2020 [Member] | Designated as Hedging Instrument [Member]    
Forward Cash Flow Hedge Relationship [Abstract]    
Lower maturity range date term Aug. 01, 2015  
Forecasted notional amount $ 15,000,000  
Variable interest rate 1 month LIBOR  
Fixed interest rate 1.47%  
Higher maturity range date term Aug. 01, 2020  
Interest rate derivative assets, at fair value $ 448,000  
Unrealized gain in accumulated other comprehensive income $ 272,000  
[1] No cash will be exchanged prior to the term.