Deposits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deposits, by Component, Alternative [Abstract]
Noninterest-bearing deposits	$ 276,295	$ 231,718
NOW and money market deposits	637,552	588,105
Savings deposits	118,123	119,693
Core certificates of deposit of $100 thousand or more	165,979	187,513
Other core certificates of deposit	188,733	227,867
Brokered certificates of deposit of $100 thousand or more	12,444	13,028
Other brokered certificates of deposit	3,549	3,539
Total interest-bearing	1,126,380	1,139,745
Total deposits	1,402,675	1,371,463
Interest expense on certificates of deposit of $100 thousand or more	2,632	4,265	5,942
Overdrawn demand and savings deposits reclassified as loans held for investment	403	492
Deposits of directors and executive officers and related interest	16,458	15,820
Maturities of Time Deposits [Abstract]
2013	183,354
2014	99,290
2015	73,621
2016	4,240
2017	5,764
After 2017	4,436
Total time deposits	$ 370,705