Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

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Loans - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Property
Jun. 30, 2013
Jun. 30, 2014
Property
Jun. 30, 2013
Dec. 31, 2013
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable $ 6,355,000   $ 6,355,000   $ 7,055,000
Loans receivable 2,300,810,000   2,300,810,000   2,177,498,000
Loans receivable reclassified as loans held for sale   4,637,000   8,010,000  
Sale of loans held for sale 6,759,000 30,956,000 12,717,000 59,721,000  
Allowance for off-balance sheet items 1,600,000   1,600,000   1,200,000
Loans on non-accrual status 25,381,000   25,381,000   25,877,000
Percentage decrease in loans on non-accrual status, excluding loans held for sale         1.90%
Delinquent loans (defined as 30 days or more past due) 16,910,000   16,910,000   16,274,000
Percentage decrease in delinquent loans excluding loans held for sale         3.90%
Number of real estate properties 2   2   3
Net carrying value of other real estate property 1,714,000   1,714,000   756,000
Net valuation adjustment     0   56,000
TDR loans receivable 23,600,000   23,600,000   30,000,000
Principal and interest due     6 months    
Reserves relating to loans included in allowance for loan losses 2,600,000   2,600,000   2,800,000
Net carrying value 2,450,000 787,000 3,865,000 2,268,000  
Number of loans restructured 6   11    
Serviced loans sold to unaffiliated parties 333,000,000 330,400,000 333,000,000 330,400,000  
Securities Pledged as Collateral [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable 921,200,000   921,200,000   568,700,000
Loans and Finance Receivables [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable $ 5,100,000   $ 5,100,000   $ 5,400,000
Minimum [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Due period for considering loans as impaired     90 days