ALLOWANCE FOR LOAN LOSSES - Balances in Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan Losses:
Individually evaluated for impairment	$ 4,676	$ 189
Collectively evaluated for impairment	28,110	31,229
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	32,786	31,418	$ 31,707	$ 25,904
Loans:
Individually evaluated for impairment	26,983	19,355
Collectively evaluated for impairment	3,645,270	3,248,885
Loans acquired with deteriorated credit quality	343	532
Total Loans	3,672,596	3,268,772
Commercial Real Estate \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	12,150	10,792
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	12,150	10,792	11,048	9,225
Loans:
Individually evaluated for impairment	5,675	3,084
Collectively evaluated for impairment	1,560,012	1,370,472
Loans acquired with deteriorated credit quality	0	0
Total Loans	1,565,687	1,373,556
Multi-family \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,829	2,566
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	4,829	2,566	4,521	6,264
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	812,174	585,827
Loans acquired with deteriorated credit quality	0	0
Total Loans	812,174	585,827
Residential real estate mortgage loans \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,882	3,935
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	1,882	3,935	2,438	1,495
Loans:
Individually evaluated for impairment	294	0
Collectively evaluated for impairment	492,507	519,455
Loans acquired with deteriorated credit quality	343	308
Total Loans	493,144	519,763
Commercial, industrial and agricultural loans
Allowance for Loan Losses:
Individually evaluated for impairment	4,676	189
Collectively evaluated for impairment	7,907	12,533
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	12,583	12,722	12,838	7,837
Loans:
Individually evaluated for impairment	21,014	16,271
Collectively evaluated for impairment	658,430	629,229
Loans acquired with deteriorated credit quality	0	224
Total Loans	679,444	645,724
Real estate construction and land loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,066	1,297
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	1,066	1,297	740	955
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	97,311	123,393
Loans acquired with deteriorated credit quality	0	0
Total Loans	97,311	123,393
Installment/consumer loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	276	106
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	276	106	$ 122	$ 128
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	24,836	20,509
Loans acquired with deteriorated credit quality	0	0
Total Loans	$ 24,836	$ 20,509

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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