Non-covered Loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans non-covered	$ 851,396	$ 810,977
Deferred loan costs, net	1,738	1,853
Allowance for loan losses	(17,147)	(18,032)
Total non-covered loans, net	835,987	794,798
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans non-covered	162,481	150,386
Real estate mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans non-covered	452,627	411,113
Real estate construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans non-covered	81,398	90,356
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans non-covered	$ 154,890	$ 159,122