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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Contractual Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 430,402	$ 384,920
Commitments to originate new loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	20,431	52,438
Unused funds on commercial and other lines of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	169,063	134,408
Unadvanced funds on home equity lines of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	106,121	108,745
Unadvanced funds on construction and real estate loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	133,130	87,915
Commercial letters of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	1,171	928
Standby letters of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 486	$ 486

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- Definition

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- Definition

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