Borrowings (Narrative - Junior Subordinated Debentures and Other Borrowings) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended	27 Months Ended	61 Months Ended		27 Months Ended	61 Months Ended		12 Months Ended	25 Months Ended	63 Months Ended		25 Months Ended	63 Months Ended		2 Months Ended	12 Months Ended	55 Months Ended			2 Months Ended	55 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Trust Preferred Securities [Member] Trust I Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Trust I Capital Securities [Member] Private Placement [Member]	Sep. 15, 2010 Trust Preferred Securities [Member] Trust I Capital Securities [Member] Private Placement [Member]	Aug. 29, 2005 Trust Preferred Securities [Member] Trust I Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Trust I Debentures [Member]	Sep. 15, 2010 Trust Preferred Securities [Member] Trust I Debentures [Member]	Aug. 29, 2005 Trust Preferred Securities [Member] Trust I Debentures [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Trust II Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Trust II Capital Securities [Member] Private Placement [Member]	Nov. 23, 2010 Trust Preferred Securities [Member] Trust II Capital Securities [Member] Private Placement [Member]	Aug. 29, 2005 Trust Preferred Securities [Member] Trust II Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Trust II Debentures [Member]	Nov. 23, 2010 Trust Preferred Securities [Member] Trust II Debentures [Member]	Aug. 29, 2005 Trust Preferred Securities [Member] Trust II Debentures [Member]	Jun. 15, 2008 Trust Preferred Securities [Member] Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Capital Securities [Member] Private Placement [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Capital Securities [Member] Private Placement [Member]	Apr. 07, 2008 Trust Preferred Securities [Member] Capital Securities [Member] Private Placement [Member] investor	Apr. 07, 2008 Trust Preferred Securities [Member] Capital Securities [Member] Issuance of Common Securities [Member]	Jun. 15, 2008 Trust Preferred Securities [Member] Washington Preferred Debentures [Member]	Dec. 31, 2012 Trust Preferred Securities [Member] Washington Preferred Debentures [Member]	Apr. 07, 2008 Trust Preferred Securities [Member] Washington Preferred Debentures [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Junior subordinated debentures	$ 32,991	$ 32,991							$ 8,300							$ 14,400								$ 10,300
Amount of capital securities issued						8,300							14,400							10,000	310
Number of institutional investors																				2
Minimum redemption period			5 years							5 years								5 years
Redemption rate					5.965%			5.965%				5.96%			5.96%		6.2275%					6.2275%
Description of variable rate basis				three-month LIBOR			three-month LIBOR				three-month LIBOR			three-month LIBOR					three-month LIBOR				three-month LIBOR
Basis spread on variable rate				1.45%			1.45%				1.45%			1.45%					3.50%				3.50%
Securities sold under repurchase agreements	$ 0	$ 19,500