OFF BALANCE SHEET RISKS, COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments and letters of credit
Loan commitment, line credit	$ 1,571,130	$ 1,709,869
Unused warehouse lines of credit
Commitments and letters of credit
Loan commitment, line credit	436,541	591,305
Unused home equity lines of credit
Commitments and letters of credit
Loan commitment, line credit	363,195	377,277
Unused loan commitments - other
Commitments and letters of credit
Loan commitment, line credit	757,657	720,645
Standby letters of credit
Commitments and letters of credit
Loan commitment, line credit	11,252	10,642
FHLB letters of credit
Commitments and letters of credit
Loan commitment, line credit	$ 2,485	$ 10,000