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Commitments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Mortgage banking derivative commitments :
Interest rate lock commitments	$ 70,139	$ 12,300
Forward contracts for the future delivery of mortgage loans	13,078
Forward contracts for the future purchase of mortgage-backed securities	45,000
Corresponding recorded balances :
Derivative asset	1,696	66
Derivative liability	1,059
Reserve for loan repurchases	$ 247	$ 19

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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