Loans Receivable (Narrative) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012 Day	Jun. 30, 2011
Loans Receivable [Line Items]
Percentage of covered loan loss, covered under loss share agreements	80.00%
Percentage of covered loan losses that exceeds the threshold, covered under loss share agreements	95.00%
Number of acquisitions	4
Number of days until accrual of interest on loans is discontinued	90
Number of days threshold for personal loans to be charged down to net collateral value, less cost to sell	180
Non-covered troubled debt restructurings modified during the current period	$ 3,724,000	$ 6,459,000
Total TDRs	22,630,000	22,480,000
Total TDRs [Member]
Loans Receivable [Line Items]
Total TDRs	$ 22,630,000	$ 22,480,000