Reserve for Repurchased Loans (Analysis of Reserve for Repurchased Loans) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loans Receivable [Line Items]
Balance at beginning of period	$ 855	$ 809	$ 705	$ 809
Provision charged to operations	100		250
Loss on loans repurchased or settlements
Balance at end of period	$ 955	$ 809	$ 955	$ 809