Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification of held-to-maturity from available-for-sale securities			$ (48)	$ (11)
Reclassification adjustments for net gains realized in earnings, derivatives, tax	62	62	185	143
Available-for-sale securities [Member]
Reclassification adjustments for net gains realized in earnings, available-for-sale, tax		345		345
Reclassification of held-to-maturity from available-for-sale securities	138	226	383	715
Held-to-maturity securities [Member]
Reclassification adjustments for net gains realized in earnings, available-for-sale, tax		$ 345		$ 345