Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains (losses) on securities arising during the period	$ 6,344	$ (5,544)	$ 12,510	$ 16,863
Reclassification adjustment for gains on securities included in net income	0	(48)	(125)	(50)
Total unrealized gains (losses) on securities	6,344	(5,592)	12,385	16,813
Unrealized holding gains (losses) on derivatives arising from during the period	1,504	(27)	2,172	(27)
Unrealized holding gains (losses) on securities arising during the period	(2,221)	1,938	(4,377)	(5,902)
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	1	(6)	1
Total unrealized gain on derivatives	1,504	(26)	2,166	(26)
Reclassification adjustment for gains on securities included in net income	0	17	44	18
Total other comprehensive (loss) income	7,848	(5,618)	14,551	16,787
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(2,221)	1,955	(4,333)	(5,884)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(526)	9	(760)	9
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	2	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	(526)	9	(758)	9
Other Comprehensive Income (Loss), Tax	(2,747)	1,964	(5,091)	(5,875)
Other comprehensive income (loss) before reclassification adjustment	4,123	(3,606)	8,133	10,961
Total unrealized (losses) gains on securities	4,123	(3,637)	8,052	10,929
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	978	(18)	1,412	(18)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	(1)	4	(1)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	978	(17)	1,408	(17)
Total other comprehensive (loss) income	5,101	(3,654)	9,460	10,912
Reclassification adjustment for gains on securities included in net income	$ 0	$ 31	$ 81	$ 32