Supplemental Comprehensive Income Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding (losses) gains on securities arising during the period	$ 9,950	$ (25,230)	$ 22,407	$ (27,641)
Reclassification adjustment for gains on securities included in net income	(2)	(4)	(2)	(8)
Total unrealized (losses) gains on securities	9,948	(25,234)	22,405	(27,649)
Total other comprehensive (loss) income	9,948	(25,234)	22,405	(27,649)
Unrealized holding (losses) gains on securities arising during the period	(3,479)	8,822	(7,840)	9,665
Reclassification adjustment for gains on securities included in net income	1	2	1	3
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(3,478)	8,824	(7,839)	9,668
Total other comprehensive (loss) income	(3,478)	8,824	(7,839)	9,668
Other comprehensive income (loss) before reclassification adjustment	6,471	(16,408)	14,567	(17,976)
Reclassification adjustment for gains on securities included in net income	(1)	(2)	(1)	(5)
Total unrealized (losses) gains on securities	6,470	(16,410)	14,566	(17,981)
Total other comprehensive (loss) income	$ 6,470	$ (16,410)	$ 14,566	$ (17,981)