Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Other Comprehensive Income [Abstract]
Net unrealized gains on securities: Balance, Beginning of Period	$ 818	$ 615	$ 1,147	$ 423
Unrealized holding gains arising during period, pre-tax	469	1,065	145	1,511
Unrealized holding gains arising during period, tax	170	422	26	593
Unrealized holding gains arising during period, after-tax	299	643	119	918
Less: Reclassification adjustment for gains included in net income, pre-tax	283	30	507	155
Less: Reclassification adjustment for gains included in net income, tax	95	10	170	52
Less: Reclassification adjustment for gains included in net income	188	20	337	103
Net unrealized gains (losses) on securities arising during period, pre-tax	186	1,035	(362)	1,356
Net unrealized gains (losses) on securities arising during period, tax	75	412	(144)	541
Net unrealized gains (losses) on securities arising during the period, after-tax	111	623	(218)	815
Net unrealized gains on securities: Balance, End of Period	929	1,238	929	1,238
Net unrealized gains (losses) on cash flow hedges: Balance, Beginning of Period		(216)	(26)	(300)
Unrealized holding gains on cash flow hedges arising during the period, pre-tax		124	43	263
Unrealized holding gains on cash flow hedges arising during the period, tax		50	17	105
Unrealized holding gains on cash flow hedges arising during the period, after-tax		74	26	158
Net unrealized gains (losses) on cash flow hedges: Balance, End of Period		(142)		(142)
Accumulated other comprehensive income, net of tax	$ 929	$ 1,096	$ 929	$ 1,096	$ 1,121