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LOANS - Balances in Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Individually evaluated for impairment		$ 4,676
Collectively evaluated for impairment		28,110
Total Allowance for Loan Losses	$ 44,200	32,786	$ 31,418	$ 31,707
Loans:
Individually evaluated for impairment		26,983
Collectively evaluated for impairment		3,645,270
Loans acquired with deteriorated credit quality		343
Total Loans	4,605,583	3,672,596
Commercial Real Estate | Mortgage loans
Allowance for Loan Losses:
Collectively evaluated for impairment		12,150
Total Allowance for Loan Losses	8,534	12,150	10,792	11,048
Loans:
Individually evaluated for impairment		5,675
Collectively evaluated for impairment		1,560,012
Total Loans		1,565,687
Multi-family
Allowance for Loan Losses:
Collectively evaluated for impairment		4,829
Total Allowance for Loan Losses	1,736	4,829	2,566	4,521
Loans:
Collectively evaluated for impairment		812,174
Total Loans		812,174
Multi-family | Mortgage loans
Loans:
Total Loans	899,730	812,174
Residential Real Estate Loans
Loans:
Total Loans	434,689	493,144
Residential Real Estate Loans | Mortgage loans
Allowance for Loan Losses:
Collectively evaluated for impairment		1,882
Total Allowance for Loan Losses	3,062	1,882	3,935	2,438
Loans:
Individually evaluated for impairment		294
Collectively evaluated for impairment		492,507
Loans acquired with deteriorated credit quality		343
Total Loans	434,689	493,144
Commercial, industrial and agricultural:
Allowance for Loan Losses:
Individually evaluated for impairment		4,676
Collectively evaluated for impairment		7,907
Total Allowance for Loan Losses	27,363	12,583	12,722	12,838
Loans:
Individually evaluated for impairment		21,014
Collectively evaluated for impairment		658,430
Total Loans	1,527,147	679,444
Real estate construction and land loans
Allowance for Loan Losses:
Collectively evaluated for impairment		1,066
Total Allowance for Loan Losses	2,175	1,066	1,297	740
Loans:
Collectively evaluated for impairment		97,311
Total Loans	82,479	97,311
Installment/consumer loans
Allowance for Loan Losses:
Collectively evaluated for impairment		276
Total Allowance for Loan Losses	1,330	276	$ 106	$ 122
Loans:
Collectively evaluated for impairment		24,836
Total Loans	$ 23,019	$ 24,836

X

- Definition

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

+ References

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- Definition

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

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- Definition

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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- Definition

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

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