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Fair Value Measurement - Carrying Value and Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Jan. 11, 2013
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Cash and cash equivalents, Carrying Value $ 62,235 $ 77,331 $ 78,084 $ 42,613
Available for sale securities, Fair value 517,388 511,006    
Loans held for sale, Carrying Value 4,230 4,838    
Loans, net, Carrying Value 1,060,901 1,029,192 1,060,901  
FHLB stock, Carrying Value 18,068 26,464    
Accrued interest receivable, Carrying Value 5,161 5,694    
FHLB advances, Carrying Value (50,000) (50,000)    
Repurchase agreements and other, Carrying Value (90,572) (90,578)    
Advance payments by borrowers for taxes and insurance, Carrying Value (12,246) (20,060)    
Accrued interest payable, Carrying Value (585) (550)    
Carrying Value [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Cash and cash equivalents, Carrying Value 62,235 77,331    
Available for sale securities, Carrying value 517,388 511,006    
Loans held for sale, Carrying Value 4,230 4,838    
Loans held for sale, Fair Value 1,060,901      
Loans, net, Carrying Value 1,060,901      
Loans, net, Carrying Value   1,029,192    
FHLB stock, Carrying Value 18,068      
FHLB stock, Carrying Value   26,464    
FHLB stock, Fair Value         
Accrued interest receivable, Carrying Value 5,161 5,694    
Interest rate caps, Carrying Value 419 546    
Checking, savings and money market accounts, Carrying Value (929,720) (899,481)    
Certificates of deposit, Carrying Value (468,347) (492,271)    
FHLB advances, Carrying Value (50,000) (50,000)    
Repurchase agreements and other, Carrying Value (90,572) (90,578)    
Advance payments by borrowers for taxes and insurance, Carrying Value (12,246) (20,060)    
Accrued interest payable, Carrying Value (585) (550)    
Carrying Value [Member] | Purchased Certificate of Deposit Option [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Carrying Value 267 155    
Carrying Value [Member] | Written Certificate of Deposit Option [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Carrying Value (267) (155)    
Estimate Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Cash and cash equivalents, Fair Value 62,235 77,331    
Available for sale securities, Fair value 458 445    
Loans held for sale, Fair Value          
Loans, net, Carrying Value          
Loans, net, Carrying Value         
FHLB stock, Carrying Value         
FHLB stock, Carrying Value         
FHLB stock, Fair Value         
Accrued interest receivable, Fair Value          
Interest rate caps, Fair Value          
Checking, savings and money market accounts, Fair Value (929,720) (899,481)    
Certificates of deposit, Fair Value         
FHLB advances, Fair Value         
Repurchase agreements and other, Fair Value          
Advance payments by borrowers for taxes and insurance, Fair Value          
Accrued interest payable, Fair Value          
Estimate Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Cash and cash equivalents, Fair Value          
Available for sale securities, Fair value 516,930 510,561    
Loans held for sale, Fair Value 4,258 4,866    
Loans, net, Carrying Value 4,258 4,866    
Loans, net, Carrying Value         
FHLB stock, Carrying Value         
FHLB stock, Carrying Value         
FHLB stock, Fair Value         
Accrued interest receivable, Fair Value 1,964 2,584    
Interest rate caps, Fair Value          
Checking, savings and money market accounts, Fair Value          
Certificates of deposit, Fair Value (476,104) (500,651)    
FHLB advances, Fair Value (54,903) (55,327)    
Repurchase agreements and other, Fair Value (97,200) (98,462)    
Advance payments by borrowers for taxes and insurance, Fair Value (12,246) (20,060)    
Accrued interest payable, Fair Value (585) (550)    
Estimate Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Cash and cash equivalents, Fair Value          
Available for sale securities, Fair value          
Loans held for sale, Fair Value          
Loans, net, Carrying Value          
Loans, net, Carrying Value 1,068,745      
FHLB stock, Carrying Value   1,031,491    
FHLB stock, Carrying Value         
FHLB stock, Fair Value         
Accrued interest receivable, Fair Value 3,197 3,110    
Interest rate caps, Fair Value 419 546    
Checking, savings and money market accounts, Fair Value          
Certificates of deposit, Fair Value         
FHLB advances, Fair Value          
Repurchase agreements and other, Fair Value          
Advance payments by borrowers for taxes and insurance, Fair Value          
Accrued interest payable, Fair Value          
Estimate Fair Value [Member] | Purchased Certificate of Deposit Option [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value          
Estimate Fair Value [Member] | Purchased Certificate of Deposit Option [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value 267 155    
Estimate Fair Value [Member] | Purchased Certificate of Deposit Option [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value          
Estimate Fair Value [Member] | Written Certificate of Deposit Option [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value          
Estimate Fair Value [Member] | Written Certificate of Deposit Option [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value (267) (155)    
Estimate Fair Value [Member] | Written Certificate of Deposit Option [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]        
Certificate of deposit option, Fair Value