Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance beginning of period	$ 3,926
Net unrealized gains on investment securities	2,932	5,485	1,254
Balance end of period	6,467	3,926
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Unrealized holding gains losses arising during the period, taxes	1,511	2,826	646
Reclassification adjustment for investment securities, taxes	151	156	294
Unrealized losses on securities for which an other-than-temporary impairment loss recognized, taxes		9	375
Unrealized gain on interest rate swaps, tax	50	213	106
Change in benefit obligation and plan assets for defined benefit pension plan, taxes	0	80	80
Net Unrealized Gains(Losses) on Securities [Member]
Balance beginning of period	4,133	(1,064)	(2,474)
Net unrealized gains on investment securities	2,932	5,485	1,254
Reclassification adjustment for investment securities transactions	(294)	(304)	(572)
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings		16	728
Balance end of period	6,771	4,133	(1,064)
Derivatives [Member]
Balance beginning of period	(207)	206	0
Unrealized gain on interest rate swaps	(97)	(413)	206
Balance end of period	(304)	(207)	206
Adjustments Related to Defined Benefit Pension Plans[Member]
Balance beginning of period		(154)	0
Change in benefit obligation and plan assets for defined benefit pension plan		154	(154)
Balance end of period	0	0	(154)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance beginning of period	3,926	(1,012)	(2,474)
Net unrealized gains on investment securities	2,932	5,485	1,254
Reclassification adjustment for investment securities transactions	(294)	(304)	(572)
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings		16	728
Unrealized gain on interest rate swaps	(97)	(413)	206
Change in benefit obligation and plan assets for defined benefit pension plan		154	(154)
Balance end of period	$ 6,467	$ 3,926	$ (1,012)