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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
FHLB advances $ 198,900,000 $ 448,700,000  
Weighted-average interest rate 4.52% 3.89%  
Average outstanding balance 362,700,000 548,000,000  
Maximum outstanding balance 448,800,000 548,600,000  
Overnight borrowings 26,000,000    
Overnight borrowings with cost basis points 0.12%    
Loans at carrying value 3,479,797,000 3,532,771,000  
Investment securities at carrying value 2,240,000,000    
Prepayment penalties on Borrowings 20,400,000 3,300,000 18,700,000
Funds borrowed under repurchase agreement $ 473,200,000 $ 509,400,000  
Weighted average interest rate 0.28% 0.35%