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Loans Receivable, Net - Analysis of Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Balance at beginning of year $ 20,930us-gaap_LoansAndLeasesReceivableAllowance $ 20,510us-gaap_LoansAndLeasesReceivableAllowance $ 18,230us-gaap_LoansAndLeasesReceivableAllowance
Provision charged to operations 2,630us-gaap_ProvisionForLoanAndLeaseLosses 2,800us-gaap_ProvisionForLoanAndLeaseLosses 7,900us-gaap_ProvisionForLoanAndLeaseLosses
Charge-offs (7,827)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (3,521)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (7,084)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries 584us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 1,141us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 1,464us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Balance at end of year $ 16,317us-gaap_LoansAndLeasesReceivableAllowance $ 20,930us-gaap_LoansAndLeasesReceivableAllowance $ 20,510us-gaap_LoansAndLeasesReceivableAllowance