Other Real Estate Owned (Rollforward of other real estate owned) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Real Estate Acquired Through Foreclosure [Roll Forward]
Balance, beginning of period	$ 6,650		$ 4,429		$ 11,538
Additions to OREO	1,864		9,572		8,946
Proceeds from sale of OREO	(3,391)		(6,429)		(13,442)
Valuation adjustments in the period	(172)	[1]	(922)	[1]	(2,613)	[1]
Balance, end of period	$ 4,951		$ 6,650		$ 4,429

[1] Amount includes chargedowns and gains/losses on sale of OREO