FDIC Indemnification Asset (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
FDIC Indemnification Asset [Abstract]
FDIC True-up provisions	$ 1,100,000				$ 1,100,000
Write-down of FDIC indemnification asset	1,400,000
Balance, beginning of period	21,774,000		28,348,000
Accretion	54,000		65,000
Transfers to FDIC claims receivable	(270,000)		0
Change in expected cash flows	(1,335,000)	[1]	(93,000)	[1]
Change in FDIC true up provision	(25,000)		(60,000)
Balance, end of period	$ 20,198,000		$ 28,260,000

[1] The decrease during the first three months of 2013 was due to loan pay-offs, improved cash flow projections, and lower loss expectations for covered loans. Amount does not reflect adoption of ASU 2012-06, which was immaterial for the first three months of 2013.