Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 10,070	$ 9,980
Reclassification adjustment for gains on securities included in net income	0	(105)
Total unrealized gains on securities	10,070	9,875
Unrealized holding gains on derivatives arising during the period	1,735	1,195
Unrealized holding gains on securities arising during the period	(3,524)	(3,491)
Reclassification adjustment for gains on derivatives included in net income, before Tax	(15)	5
Total unrealized gain on derivatives	1,720	1,200
Reclassification adjustment for gains on securities included in net income	0	37
Total other comprehensive (loss) income	11,790	11,075
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(3,524)	(3,454)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(607)	(418)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	5	(2)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	(602)	(420)
Other Comprehensive Income (Loss), Tax	(4,126)	(3,874)
Other comprehensive income (loss) before reclassification adjustment	6,546	6,489
Total unrealized (losses) gains on securities	6,546	6,421
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1,128	777
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	10	(3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	1,118	780
Total other comprehensive (loss) income	7,664	7,201
Reclassification adjustment for gains on securities included in net income	$ 0	$ 68