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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Contractual Amounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 383,992	$ 161,269
Commitments to originate new loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	52,438	41,731
Unused funds on commercial and other lines of credit
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	243,153	98,823
Unadvanced funds on construction and real estate loans
Loss Contingencies [Line Items]
Contractual amounts of commitments and contingent liabilities	$ 87,915	20,330
Standby letters of credit
Loss Contingencies [Line Items]
Maturity period (in years)	5 years
Contractual amounts of commitments and contingent liabilities	$ 486	$ 385

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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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