Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense (benefit)									$ (2,327)	$ 970	$ 1,293
Deferred income tax expense (benefit), due to:
Reserve for loan losses	(1,949)				(613)				(1,949)	(613)	(815)
Net operating loss carryforwards	(825)				0				(825)	0	0
Valuation allowance on deferred tax assets	5,376				0				5,376	0	0
Other items	(127)				493				(127)	493	351
Total deferred income tax expense (benefit)	2,475				(120)				2,475	(120)	(464)
Provision for income taxes	$ 5,212	$ (3,238)	$ (411)	$ (1,415)	$ 120	$ 362	$ 212	$ 156	$ 148	$ 850	$ 829