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LOAN SERVICING - Activity in SBA-Guaranteed Loan Servicing Asset (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]      
SBA servicing fees $ 30,077 $ 24,581  
SBA-Guaranteed Loan Servicing [Member]      
Servicing Assets at Fair Value [Line Items]      
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance 400    
SBA loans sold to investors with servicing retained 300,857   $ 305,977
SBA loans sold with servicing retained 12,288 0  
Gain from sale of SBA loan, pretax 1,101 0  
SBA servicing fees 750 115  
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance at beginning of period 5,058 0  
Fair value of servicing rights acquired 0 5,399  
Additions 388 0  
Impairment (charge) / recovery (90) 0  
Amortization (294) (60)  
Balance at end of period 5,062 5,339  
Loan servicing rights, fair value, start 5,058 0  
Loan servicing rights, fair value, end $ 5,062 $ 5,339