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Additional Information Regarding Impaired Loans (Detail) (Non Covered Loans, USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]  
Recorded Investment$ 405,345$ 760,798
Unpaid Principal Balance425,294795,062
Related Allowance37916,007
Average Recorded Investment522,272 
Interest Income Recognized5,504 
Multi-Family
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment288,133497,290
Unpaid Principal Balance301,401516,220
Related Allowance446,756
Average Recorded Investment363,373 
Interest Income Recognized3,980 
Multi-Family | Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment285,436447,137
Unpaid Principal Balance298,704464,011
Average Recorded Investment350,958 
Interest Income Recognized3,935 
Multi-Family | Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment2,69750,153
Unpaid Principal Balance2,69752,209
Related Allowance446,756
Average Recorded Investment12,415 
Interest Income Recognized45 
Commercial Real Estate
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment59,180145,787
Unpaid Principal Balance60,858148,380
Related Allowance 1,555
Average Recorded Investment79,470 
Interest Income Recognized1,229 
Commercial Real Estate | Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment59,180120,087
Unpaid Principal Balance60,858122,486
Average Recorded Investment67,623 
Interest Income Recognized1,229 
Commercial Real Estate | Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 25,700
Unpaid Principal Balance 25,894
Related Allowance 1,555
Average Recorded Investment11,847 
Acquisition, Development and Construction
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment46,309100,808
Unpaid Principal Balance47,177109,175
Related Allowance 7,553
Average Recorded Investment67,234 
Interest Income Recognized285 
Acquisition, Development and Construction | Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment46,30965,453
Unpaid Principal Balance47,17771,541
Average Recorded Investment47,907 
Interest Income Recognized285 
Acquisition, Development and Construction | Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 35,355
Unpaid Principal Balance 37,634
Related Allowance 7,553
Average Recorded Investment19,327 
One to Four Family
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,4993,984
Unpaid Principal Balance1,5194,080
Related Allowance 13
Average Recorded Investment3,156 
Interest Income Recognized10 
One to Four Family | Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,4993,611
Unpaid Principal Balance1,5193,707
Average Recorded Investment3,156 
Interest Income Recognized10 
One to Four Family | Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 373
Unpaid Principal Balance 373
Related Allowance 13
Commercial and Industrial
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment10,22412,929
Unpaid Principal Balance14,33917,207
Related Allowance335130
Average Recorded Investment9,039 
Commercial and Industrial | Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment8,88610,919
Unpaid Principal Balance13,00115,197
Average Recorded Investment6,591 
Commercial and Industrial | Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,3382,010
Unpaid Principal Balance1,3382,010
Related Allowance335130
Average Recorded Investment2,448 
Impaired Financing Receivable with No Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment401,310647,207
Unpaid Principal Balance421,259676,942
Average Recorded Investment476,235 
Interest Income Recognized5,459 
Impaired Financing Receivable with Related Allowance
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment4,035113,591
Unpaid Principal Balance4,035118,120
Related Allowance37916,007
Average Recorded Investment46,037 
Interest Income Recognized$ 45