Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 660	$ 1,702	$ (3,322)	$ 4,245
Reclassification adjustment for gains on securities included in net income	(5,262)	49	(8,102)	(603)
Total unrealized gains on securities	(4,602)	1,751	(11,424)	3,642
Unrealized holding gains (losses) on derivatives arising during the period	97	(66)	(33)	(582)
Unrealized holding gains on securities arising during the period	(139)	(596)	698	(1,486)
Reclassification adjustment for gains on derivatives included in net income, before Tax	10	(5)	10	73
Total unrealized gain on derivatives	107	(71)	(23)	(509)
Reclassification adjustment for gains on securities included in net income	1,105	(17)	1,701	211
Total other comprehensive (loss) income	(4,495)	1,680	(11,447)	3,133
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	966	(613)	2,399	(1,275)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(20)	23	7	204
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(3)	2	(3)	(26)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	(23)	25	4	178
Other Comprehensive Income (Loss), Tax	943	(588)	2,403	(1,097)
Other comprehensive income (loss) before reclassification adjustment	521	1,106	(2,624)	2,759
Total unrealized (losses) gains on securities	(3,636)	1,138	(9,025)	2,367
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	77	(43)	(26)	(378)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(7)	3	(7)	(47)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	84	(46)	(19)	(331)
Total other comprehensive (loss) income	(3,552)	1,092	(9,044)	2,036
Reclassification adjustment for gains on securities included in net income	$ 4,157	$ (32)	$ 6,401	$ 392