Derivative Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 325,000	$ 325,000
Not Designated as Hedging Instrument [Member]
Interest rate swap agreements [Abstract]
Notional amount of interest rate swap		1,333,144	792,224
Estimated fair value of interest rate swap		(134)	(199)
Pay Fixed / Receive Variable Swaps [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swap agreements [Abstract]
Notional amount of interest rate swap		666,572	396,112
Estimated fair value of interest rate swap		16,004	16,130
Pay Variable / Receive Fixed Swaps [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swap agreements [Abstract]
Notional amount of interest rate swap		666,572	396,112
Estimated fair value of interest rate swap		$ (16,138)	(16,329)
Interest Rate Swap April 2016 April 2020 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate			2.265%
Term, lower maturity range date	[1]	Apr. 01, 2016	Apr. 01, 2016
Term, higher maturity range date	[1]	Apr. 01, 2020	Apr. 01, 2020
Interest rate derivative liabilities, at fair value		$ (727)	$ (784)
Unrealized gain in accumulated other comprehensive income		(442)	(476)
Interest Rate Swap April 2016 April 2020 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate		2.265%
Interest Rate Swap April 2016 April 2022 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 34,000
Variable interest rate		3 month LIBOR
Fixed interest rate			2.646%
Term, lower maturity range date	[1]	Apr. 01, 2016	Apr. 01, 2016
Term, higher maturity range date	[1]	Apr. 01, 2022	Apr. 01, 2022
Interest rate derivative liabilities, at fair value		$ (1,304)	$ (1,478)
Unrealized gain in accumulated other comprehensive income		(792)	(898)
Interest Rate Swap April 2016 April 2022 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 34,000
Variable interest rate		3 month LIBOR
Fixed interest rate		2.646%
Interest Rate Swap October 2016 October 2020 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 34,000
Variable interest rate		3 month LIBOR
Fixed interest rate			2.523%
Term, lower maturity range date	[1]	Oct. 01, 2016	Oct. 01, 2016
Term, higher maturity range date	[1]	Oct. 01, 2020	Oct. 01, 2020
Interest rate derivative liabilities, at fair value		$ (1,081)	$ (908)
Unrealized gain in accumulated other comprehensive income		(657)	$ (552)
Interest Rate Swap October 2016 October 2020 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 34,000
Variable interest rate		3 month LIBOR
Fixed interest rate		2.523%
Interest Rate Swap July 2014 July 2021 [Member]
Forward cash flow hedge relationship [Abstract]
Term, lower maturity range date	[1]	Jul. 01, 2014	Jul. 01, 2014
Term, higher maturity range date	[1]	Jul. 01, 2021	Jul. 01, 2021
Interest rate derivative assets, at fair value		$ 395	$ 663
Unrealized gain in accumulated other comprehensive income		$ 240	403
Interest Rate Swap July 2014 July 2021 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 27,500
Variable interest rate		1 month LIBOR	1 month LIBOR
Fixed interest rate		2.09%	2.09%
Interest Rate Swap July 2014 July 2022 [Member]
Forward cash flow hedge relationship [Abstract]
Term, lower maturity range date	[1]	Jul. 01, 2014	Jul. 01, 2014
Term, higher maturity range date	[1]	Jul. 01, 2022	Jul. 01, 2022
Interest rate derivative assets, at fair value		$ 610	$ 968
Unrealized gain in accumulated other comprehensive income		$ 371	588
Interest Rate Swap July 2014 July 2022 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 25,000
Variable interest rate		1 month LIBOR	1 month LIBOR
Fixed interest rate		2.27%	2.27%
Interest Rate Swap July 2014 July 2023 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 27,500
Fixed interest rate		2.42%	2.42%
Term, lower maturity range date	[1]	Jul. 01, 2014	Jul. 01, 2014
Term, higher maturity range date	[1]	Jul. 01, 2023	Jul. 01, 2023
Interest rate derivative assets, at fair value		$ 874	$ 1,320
Unrealized gain in accumulated other comprehensive income		$ 531	$ 802
Interest Rate Swap July 2014 July 2023 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Variable interest rate		1 month LIBOR	1 month LIBOR
Interest Rate Swap July 2014 July 2024 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 30,000
Fixed interest rate		2.50%	2.50%
Term, lower maturity range date	[1]	Jul. 01, 2014	Jul. 01, 2014
Term, higher maturity range date	[1]	Jul. 01, 2024	Jul. 01, 2024
Interest rate derivative assets, at fair value		$ 900	$ 1,333
Unrealized gain in accumulated other comprehensive income		$ 547	$ 810
Interest Rate Swap July 2014 July 2024 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Variable interest rate		1 month LIBOR	1 month LIBOR
Interest Rate Swap October 2017 October 2021 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate			2.992%
Term, lower maturity range date	[1]	Oct. 01, 2017	Oct. 01, 2017
Term, higher maturity range date	[1]	Oct. 01, 2021	Oct. 01, 2021
Interest rate derivative liabilities, at fair value		$ (1,200)	$ (1,112)
Unrealized gain in accumulated other comprehensive income		(729)	(676)
Interest Rate Swap October 2017 October 2021 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate		2.992%
Interest Rate Swap April 2018 July 2022 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate			3.118%
Term, lower maturity range date	[1]	Apr. 01, 2018	Apr. 01, 2018
Term, higher maturity range date	[1]	Jul. 01, 2022	Jul. 01, 2022
Interest rate derivative liabilities, at fair value		$ (1,222)	$ (1,170)
Unrealized gain in accumulated other comprehensive income		(743)	(711)
Interest Rate Swap April 2018 July 2022 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate		3.118%
Interest Rate Swap July 2018 October 2022 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate			3.158%
Term, lower maturity range date	[1]	Jul. 01, 2018	Jul. 01, 2018
Term, higher maturity range date	[1]	Oct. 01, 2022	Oct. 01, 2022
Interest rate derivative liabilities, at fair value		$ (1,198)	$ (1,158)
Unrealized gain in accumulated other comprehensive income		(728)	$ (704)
Interest Rate Swap July 2018 October 2022 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount		$ 33,000
Variable interest rate		3 month LIBOR
Fixed interest rate		3.158%
Interest Rate Swap August 2015 - August 2018 [Member]
Forward cash flow hedge relationship [Abstract]
Term, lower maturity range date	[1]	Aug. 01, 2015	Aug. 01, 2015
Term, higher maturity range date	[1]	Aug. 01, 2018	Aug. 01, 2018
Interest rate derivative assets, at fair value		$ 0
Interest rate derivative liabilities, at fair value			$ (46)
Unrealized gain in accumulated other comprehensive income		$ 0	(28)
Interest Rate Swap August 2015 - August 2018 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 0
Variable interest rate		1 month LIBOR	1 month LIBOR
Fixed interest rate		1.048%	1.048%
Interest Rate Swap August 2015 - August 2019 [Member]
Forward cash flow hedge relationship [Abstract]
Term, lower maturity range date	[1]	Aug. 02, 2015	Aug. 02, 2015
Term, higher maturity range date	[1]	Aug. 01, 2019	Aug. 01, 2019
Interest rate derivative assets, at fair value		$ 0
Interest rate derivative liabilities, at fair value			$ (34)
Unrealized gain in accumulated other comprehensive income		$ 0	(21)
Interest Rate Swap August 2015 - August 2019 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 0
Variable interest rate		1 month LIBOR	1 month LIBOR
Fixed interest rate		1.281%	1.281%
Interest Rate Swap August 2015 - August 2020 [Member]
Forward cash flow hedge relationship [Abstract]
Forecasted notional amount			$ 15,000
Term, lower maturity range date	[1]		Aug. 03, 2015
Term, higher maturity range date	[1]		Aug. 01, 2020
Interest rate derivative liabilities, at fair value		$ (75)	$ (14)
Unrealized gain in accumulated other comprehensive income		$ (46)	$ (9)
Interest Rate Swap August 2015 - August 2020 [Member] | Designated as Hedging Instrument [Member]
Forward cash flow hedge relationship [Abstract]
Variable interest rate		1 month LIBOR	1 month LIBOR
Fixed interest rate		1.47%	1.47%

[1] No cash will be exchanged prior to the term.