Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 1,702	$ 3,802	$ 4,245	$ 13,872
Reclassification adjustment for gains on securities included in net income	49	(28)	(603)	(28)
Total unrealized gains on securities	1,751	3,774	3,642	13,844
Unrealized holding (losses) gains on derivatives arising during the period	(66)	359	(582)	2,094
Unrealized holding gains on securities arising during the period	(596)	(1,331)	(1,486)	(4,855)
Reclassification adjustment for gains on derivatives included in net income, before Tax	(5)	(26)	73	(41)
Total unrealized gain on derivatives	(71)	333	(509)	2,053
Reclassification adjustment for gains on securities included in net income	(17)	10	211	10
Total other comprehensive (loss) income	1,680	4,107	3,133	15,897
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(613)	(1,321)	(1,275)	(4,845)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	23	(126)	204	(733)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	2	9	(26)	14
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	25	(117)	178	(719)
Other Comprehensive Income (Loss), Tax	(588)	(1,438)	(1,097)	(5,564)
Other comprehensive income (loss) before reclassification adjustment	1,106	2,471	2,759	9,017
Total unrealized (losses) gains on securities	1,138	2,453	2,367	8,999
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(43)	233	(378)	1,361
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	3	17	(47)	27
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	(46)	216	(331)	1,334
Total other comprehensive (loss) income	1,092	2,669	2,036	10,333
Reclassification adjustment for gains on securities included in net income	$ (32)	$ 18	$ 392	$ 18