Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ (751)	$ 6,344	$ 13,121	$ 12,510
Reclassification adjustment for gains on securities included in net income	0	0	(28)	(125)
Total unrealized gains on securities	(751)	6,344	13,093	12,385
Unrealized holding (losses) gains on derivatives arising during the period	(1,056)	1,504	1,038	2,172
Unrealized holding gains on securities arising during the period	262	(2,221)	(4,593)	(4,377)
Reclassification adjustment for gains on derivatives included in net income, before Tax	(16)	0	(57)	(6)
Total unrealized gain on derivatives	(1,072)	1,504	981	2,166
Reclassification adjustment for gains on securities included in net income	0	0	10	44
Total other comprehensive (loss) income	(1,823)	7,848	14,074	14,551
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	262	(2,221)	(4,583)	(4,333)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	370	(526)	(363)	(760)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	6	0	20	2
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	376	(526)	(343)	(758)
Other Comprehensive Income (Loss), Tax	638	(2,747)	(4,926)	(5,091)
Other comprehensive income (loss) before reclassification adjustment	(489)	4,123	8,528	8,133
Total unrealized (losses) gains on securities	(489)	4,123	8,510	8,052
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(686)	978	675	1,412
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	10	0	37	4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	(696)	978	638	1,408
Total other comprehensive (loss) income	(1,185)	5,101	9,148	9,460
Reclassification adjustment for gains on securities included in net income	$ 0	$ 0	$ 18	$ 81