LOAN SERVICING - Schedule of Loans Serviced Not Reported as Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Federal Home Loan Mortgage Corporation
Loans Servicing For Institutional Investors [Line Items]
Loans serviced for others	$ 498,705	$ 488,790
Federal National Mortgage Association
Loans Servicing For Institutional Investors [Line Items]
Loans serviced for others	17,146	10,221
Other
Loans Servicing For Institutional Investors [Line Items]
Loans serviced for others	$ 3,455	$ 3,504