Supplemental Comprehensive Income Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 9,980	$ 12,457
Reclassification adjustment for gains on securities included in net income	(105)	0
Total unrealized gains on securities	9,875	12,457
Unrealized holding gains on derivatives arising during the period	1,195	0
Reclassification adjustment for gains on derivatives included in net income, before Tax	5	0
Total unrealized gain on derivatives	1,200	0
Total other comprehensive (loss) income	11,075	12,457
Unrealized holding gains on securities arising during the period	(3,491)	(4,361)
Reclassification adjustment for gains on securities included in net income	37	0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(3,454)	(4,361)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(418)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(2)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(420)	0
Total other comprehensive (loss) income	(3,874)	(4,361)
Other comprehensive income (loss) before reclassification adjustment	6,489	8,096
Reclassification adjustment for gains on securities included in net income	(68)	0
Total unrealized (losses) gains on securities	6,421	8,096
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	780	0
Total other comprehensive (loss) income	$ 7,201	$ 8,096