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ACQUISITION - COMMERCE BANK LOAN PORTOFOLIO ACQUIRED (Details) - USD ($) $ in Thousands		12 Months Ended
	May 17, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Interest component of expected cash flows (accretable discount)		$ (9,619)	$ (23,109)	$ (14,810)
SI Financial Group, Inc.
Business Acquisition [Line Items]
Gross contractual receivable amounts at acquisition	$ 55,754
Contractual cash flows not expected to be collected (nonaccretable discount)	(19,427)
Expected cash flows at acquisition	36,327
Interest component of expected cash flows (accretable discount)	(4,200)
Fair value of acquired loans	$ 32,127

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Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

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Amount of decrease from reclassification to nonaccretable difference of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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