MORTGAGE BANKING ACTIVITIES (Unpaid principal balance of residential mortgage loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other assets	$ 104,345	$ 101,370
Other liabilities	113,720	102,076
Loans held for sale, at fair value	77,036	114,039
Residential Mortgage [Member]
Loans held-for-sale	74,491	109,831
Loans held for sale, at fair value	77,036	114,039
Fair value	79,204	117,957
Residential Mortgage [Member] | Loan Commitments (IRLCs) [Member]
Other assets	87,062	147,494
Other assets fair value	1,717	4,825
Residential Mortgage [Member] | Forward Sales Contracts [Member]
Other liabilities	102,500	158,500
Other assets fair value	$ 451
Other liabilities at fair value		$ (907)