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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Acquired Loans Outstanding Balance and the Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 1,192,126	$ 1,237,581
Carrying amount	1,175,266	1,220,538
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	17,441	17,946
Carrying amount	16,475	16,859
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	246,153	268,218
Carrying amount	242,470	264,242
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	263,594	286,164
Carrying amount	$ 258,945	$ 281,101