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LOAN SERVICING - Mortgage Servicing Rights Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mortgage Servicing Rights [Member]      
Servicing Assets at Fair Value [Line Items]      
Mortgage loans sold with servicing retained $ 3,417,642   $ 3,256,548
Mortgage loans sold with servicing retained 236,893 $ 129,843  
Pretax gains resulting from above loan sales 3,798 3,638  
Mortgage servicing fees 2,174 1,603  
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period 29,053 13,521  
Fair value of MSRs acquired 0 8,553  
Additions 2,710 1,454  
Payoffs and curtailments (405) (139)  
Amortization (567) (523)  
Balance at end of period 30,791 22,866  
Loan servicing rights, fair value, start 32,419 17,546  
Loan servicing rights, fair value, end 36,445 26,962  
Small Business Administration Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
Mortgage loans sold with servicing retained 300,857   $ 305,977
Mortgage loans sold with servicing retained 12,288 0  
Pretax gains resulting from above loan sales 1,101 0  
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period 5,058 0  
Additions 388 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