Commitments and Contingencies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Loans held-for-sale
Commitments and Contingencies
Commitments to extend credit - fixed rate	$ 63,000	$ 48,600
Adjustable Rate Loans
Commitments and Contingencies
Commitments to purchase or sell loans	18,309	126,206
Fixed Rate
Commitments and Contingencies
Commitments to purchase or sell loans	33,363	96,390
Home Equity - unused lines of credit
Commitments and Contingencies
Commitments to extend credit - adjustable rate	138,232	182,443
Consumer and commercial loans - unused lines of credit
Commitments and Contingencies
Commitments to extend credit - adjustable rate	59,335	56,725
Mortgage Loans
Commitments and Contingencies
Commitments to extend credit - adjustable rate	80,691	287,484
Commitments to extend credit - fixed rate	253,290	263,957
Commitments to purchase or sell loans	$ 121,932	$ 64,850