Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 1,690	$ (751)	$ 5,935	$ 13,121
Reclassification adjustment for gains on securities included in net income	(92)	0	(695)	(28)
Total unrealized gains on securities	1,598	(751)	5,240	13,093
Unrealized holding (losses) gains on derivatives arising during the period	(49)	(1,056)	(631)	1,038
Unrealized holding gains on securities arising during the period	(591)	262	(2,077)	(4,593)
Reclassification adjustment for gains on derivatives included in net income, before Tax	20	(16)	93	(57)
Total unrealized gain on derivatives	(29)	(1,072)	(538)	981
Reclassification adjustment for gains on securities included in net income	32	0	243	10
Total other comprehensive (loss) income	1,569	(1,823)	4,702	14,074
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(559)	262	(1,834)	(4,583)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	17	370	221	(363)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(7)	6	(33)	20
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	10	376	188	(343)
Other Comprehensive Income (Loss), Tax	(549)	638	(1,646)	(4,926)
Other comprehensive income (loss) before reclassification adjustment	1,099	(489)	3,858	8,528
Total unrealized (losses) gains on securities	1,039	(489)	3,406	8,510
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(32)	(686)	(410)	675
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(13)	10	(60)	37
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	(19)	(696)	(350)	638
Total other comprehensive (loss) income	1,020	(1,185)	3,056	9,148
Reclassification adjustment for gains on securities included in net income	$ 60	$ 0	$ 452	$ 18