LOANS (Narrative) (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) loan_category	Mar. 31, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) tDR_Loan loan loan_category	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) tDR_Loan loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan categories | loan_category	2			2
Service rights retained, amount	$ 18,700,000			$ 18,700,000		$ 23,900,000
Number of TDR loans | tDR_Loan				1		6
Non-accrual loans included in TDR's	5,160,000			$ 5,160,000		$ 18,222,000
Financing receivable post modification recorded investment	455,000			455,000		2,094,000
Unpaid Contractual Principal Balance	6,171,000		$ 23,623,000	6,171,000	$ 23,623,000	21,674,000
Impaired financing receivable, recorded investment	6,036,000		23,388,000	6,036,000	23,388,000	21,395,000
Gross loans	1,589,475,000			1,589,475,000		$ 1,614,595,000
PCI Loans, accretion interest	91,000		100,000
Reclassification from nonaccretable difference	$ 15,000		0	$ 29,000	24,000
County First Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	3.17%			3.17%		3.78%
Gross loans	$ 50,486,000			$ 50,486,000		$ 60,977,000
Purchased credit impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	1,400,000			1,400,000
Impaired financing receivable, recorded investment	1,100,000			$ 1,100,000		$ 2,000,000
Reclassification from nonaccretable difference	$ 37,000		24,000
Purchased credit impaired | County First Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	0.07%			0.07%		0.12%
Gross loans	$ 1,144,000			$ 1,144,000		$ 1,978,000
Purchased credit impaired | County First Bank Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
New acquisition accounting for fair market value adjustment	$ 300,000			$ 300,000		$ 300,000
Net acquisition accounting fair market value adjustment, mark	20.59%			20.59%		14.95%
All Other Loans | County First Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	3.10%			3.10%		3.66%
Gross loans	$ 49,342,000			$ 49,342,000		$ 58,999,000
All Other Loans | County First Bank Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
New acquisition accounting for fair market value adjustment	$ 500,000			$ 500,000		$ 800,000
Net acquisition accounting fair market value adjustment, mark	1.09%			1.09%		1.25%
Nonaccrual Loans With No Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans included in TDR's	$ 4,400,000			$ 4,400,000		$ 12,400,000
Interest due to debt		$ 400,000		100,000
Nonaccrual Loans With Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans included in TDR's	$ 800,000			800,000		$ 5,800,000
Interest due to debt		$ 400,000		$ 100,000
Residential rentals | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt term (in years)	3 years			3 years
Residential rentals | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt term (in years)	20 years			20 years
Residential first mortgages | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt term (in years)	10 years			10 years
Residential first mortgages | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt term (in years)	30 years			30 years
Commercial loans | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term debt term (in years)				5 years
One Troubled Debt Restructuring Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan				0		3
Non-accrual loans included in TDR's						$ 1,520,000
Seven Troubled Debt Restructuring Loans with Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		6
Specific reserves for TDR loans						400,000
Financing receivable post modification recorded investment						2,100,000
Commercial loans | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank exposure, threshold limit for credit rating (or greater)						$ 1,000,000
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	100.00%			100.00%		100.00%
Gross loans	$ 1,533,051,000			$ 1,533,051,000		$ 1,504,275,000
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | tDR_Loan				0		2
Non-accrual loans included in TDR's	3,136,000			$ 3,136,000		$ 16,612,000
Financing receivable post modification recorded investment	0			0		1,376,000
Unpaid Contractual Principal Balance	3,205,000		18,355,000	3,205,000	18,355,000	17,952,000
Impaired financing receivable, recorded investment	3,136,000		18,148,000	3,136,000	18,148,000	17,714,000
Gross loans	$ 1,088,636,000			$ 1,088,636,000		$ 1,049,147,000
Commercial real estate | Commercial Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	4.80%			4.80%		6.90%
Percent of appraised value or sales price				80.00%
Commercial real estate | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	71.02%			71.02%		69.75%
Gross loans	$ 1,088,636,000			$ 1,088,636,000		$ 1,049,147,000
Residential first mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | tDR_Loan				0		2
Non-accrual loans included in TDR's	451,000			$ 451,000		$ 794,000
Financing receivable post modification recorded investment	0			0		247,000
Unpaid Contractual Principal Balance	884,000		1,741,000	884,000	1,741,000	2,001,000
Impaired financing receivable, recorded investment	872,000		1,739,000	872,000	1,739,000	1,989,000
Gross loans	$ 96,835,000			$ 96,835,000		$ 133,779,000
Residential first mortgages | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	6.32%			6.32%		8.89%
Gross loans	$ 96,835,000			$ 96,835,000		$ 133,779,000
Residential rentals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans included in TDR's	961,000			961,000		275,000
Unpaid Contractual Principal Balance	990,000		636,000	990,000	636,000	626,000
Impaired financing receivable, recorded investment	961,000		636,000	961,000	636,000	625,000
Gross loans	$ 172,082,000			$ 172,082,000		$ 139,059,000
Residential rentals | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term debt term (in years)				3 years
Residential rentals | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term debt term (in years)				20 years
Residential rentals | Apartment Buildings Rentals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of appraised value or sales price				80.00%
Residential rentals | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	11.22%			11.22%		9.24%
Gross loans	$ 172,082,000			$ 172,082,000		$ 139,059,000
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 37,139,000			$ 37,139,000		$ 37,520,000
Construction and land development | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	2.42%			2.42%		2.49%
Gross loans	$ 37,139,000			$ 37,139,000		$ 37,520,000
Home equity and second mortgages | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	1.73%			1.73%		1.94%
Gross loans	$ 26,518,000			$ 26,518,000		$ 29,129,000
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance			1,807,000		1,807,000
Impaired financing receivable, recorded investment			1,807,000		1,807,000
Gross loans	$ 48,327,000			$ 48,327,000		$ 52,921,000
Commercial loans | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	3.15%			3.15%		3.52%
Gross loans	$ 48,327,000			$ 48,327,000		$ 52,921,000
Commercial equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | tDR_Loan				1		2
Non-accrual loans included in TDR's	32,000			$ 32,000		$ 46,000
Financing receivable post modification recorded investment	455,000			455,000		471,000
Unpaid Contractual Principal Balance	490,000		532,000	490,000	532,000	527,000
Impaired financing receivable, recorded investment	487,000		$ 518,000	487,000	$ 518,000	512,000
Gross loans	$ 61,346,000			$ 61,346,000		$ 61,693,000
Commercial equipment | Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	4.00%			4.00%		4.10%
Gross loans	$ 61,346,000			$ 61,346,000		$ 61,693,000