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Net Cash Paid (Received) for Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Business Acquisition [Line Items]      
Fair value of investments acquired $ (2,917)    
Fair value of loans acquired (166,471)    
Fair value of premises and equipment acquired (3,432)    
Fair value of other assets (10,295)    
Fair value of deposits assumed 234,146    
Fair value of other liabilities assumed 741    
Purchase price in excess of net assets acquired 30,062    
Total purchase price (40,277)    
Net cash (received) paid for acquisition (152,283) (835) 882
Greenpoint
      
Business Acquisition [Line Items]      
Fair value of investments acquired 62,919    
Fair value of loans acquired 419,320    
Fair value of premises and equipment acquired 7,535    
Fair value of other assets 255,924    
Fair value of deposits assumed (649,184)    
Fair value of other liabilities assumed (60,085)    
Purchase price in excess of net assets acquired 21,810 680 1,650
Total purchase price 58,239 680 1,650
Less non-cash purchase price 26,469   768
Less cash acquired 184,053    
Net cash (received) paid for acquisition (152,283) 680 882
Book value of assets sold   (1,678)  
Book value of liabilities sold   170  
Sales price in excess of net liabilities assumed   (67)  
Total sales price (366) (1,575)  
Add cash on hand sold         
Less amount due remaining on books   60  
Net cash paid (received) for divestiture   $ (1,515)