LOANS - Additional information (Details) $ in Thousands		6 Months Ended	12 Months Ended
	May 05, 2020 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 11,960	$ 11,212
Impaired Loans Required for Specific Reserves		1,500	972
With no related allowance, Recorded Investment		10,514	10,240
Allowance for Loan and Lease Losses Write-offs, Net		373	4,100
Aggregate Impaired Loans Required For Specific Reserves			413
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged		105,600
Number of loans for which payment deferrals were granted | loan	491
Value of loans for which payment deferrals were granted	$ 240,200
Nonaccrual Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		8,000	5,900
Accrual Impaired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		4,000	$ 6,200
Troubled Debt Restructurings [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		10,300		$ 7,800
Troubled Debt Restructuring Accrual Status [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		6,400		5,300
Troubled Debt Restructuring Nonaccrual Status [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		3,900		$ 1,800
Unused Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period		$ 290,600