Accrued Interest Receivable and Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Details of accrued interest receivable and other assets
Other real estate owned	$ 1,607	$ 6,600
Accrued interest receivable	6,747	6,904
Accrued income and other receivables	2,105	2,995
Fair market value of derivative financial instruments	1,547	1,079
Prepaid FDIC insurance assessments	2,426	4,025
Other prepaid expenses	6,004	9,813
Federal Reserve Bank stock, Federal Home Loan Bank stock and other not readily marketable equity securities	7,469	9,145
Net federal deferred tax assets	11,650	13,690
Other	624	624
Total accrued interest receivable and other assets	$ 40,179	$ 54,875