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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Contractual Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 515,919	$ 430,402
Commitments to originate new loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	112,669	20,431
Unused funds on commercial and other lines of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	188,098	169,063
Unadvanced funds on home equity lines of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	114,711	106,121
Unadvanced funds on construction and real estate loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	97,500	133,130
Commercial letters of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	2,941	1,171
Standby letters of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 0	$ 486

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- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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