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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period $ 29,480us-gaap_LoansAndLeasesReceivableAllowance $ 18,805us-gaap_LoansAndLeasesReceivableAllowance $ 18,805us-gaap_LoansAndLeasesReceivableAllowance
Loans and leases charged off (357)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (203)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs  
Recoveries of loans and leases previously charged off 222us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 435us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts  
Transfer of loans from (to) held-for-sale 0us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet (963)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet (963)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Provision for loan and lease losses 0us-gaap_ProvisionForLoanAndLeaseLosses 1,929us-gaap_ProvisionForLoanAndLeaseLosses  
Balance at end of period $ 29,345us-gaap_LoansAndLeasesReceivableAllowance $ 20,003us-gaap_LoansAndLeasesReceivableAllowance $ 29,480us-gaap_LoansAndLeasesReceivableAllowance