ALLOWANCE FOR LOAN LOSSES - Balances in Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance for Loan Losses:
Individually evaluated for impairment	$ 299	$ 189
Collectively evaluated for impairment	31,485	31,229
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	31,784	31,418	$ 32,812	$ 31,707
Loans:
Individually evaluated for impairment	16,144	19,355
Collectively evaluated for impairment	3,367,014	3,248,885
Loans acquired with deteriorated credit quality	556	532
Total Loans	3,383,714	3,268,772
Commercial Real Estate \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	11,099	10,792
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	11,099	10,792	11,334	11,048
Loans:
Individually evaluated for impairment	3,372	3,084
Collectively evaluated for impairment	1,399,261	1,370,472
Loans acquired with deteriorated credit quality	0	0
Total Loans	1,402,633	1,373,556
Multi-family \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,557	2,566
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	2,557	2,566	3,002	4,521
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	624,114	585,827
Loans acquired with deteriorated credit quality	0	0
Total Loans	624,114	585,827
Residential real estate mortgage loans \| Mortgage loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,374	3,935
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	3,374	3,935	3,495	2,438
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	514,855	519,455
Loans acquired with deteriorated credit quality	318	308
Total Loans	515,173	519,763
Commercial, industrial and agricultural loans
Allowance for Loan Losses:
Individually evaluated for impairment	299	189
Collectively evaluated for impairment	12,774	12,533
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	13,073	12,722	14,055	12,838
Loans:
Individually evaluated for impairment	12,772	16,271
Collectively evaluated for impairment	658,887	629,229
Loans acquired with deteriorated credit quality	238	224
Total Loans	671,897	645,724
Real estate construction and land loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,526	1,297
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	1,526	1,297	821	740
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	147,116	123,393
Loans acquired with deteriorated credit quality	0	0
Total Loans	147,116	123,393
Installment/consumer loans
Allowance for Loan Losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	155	106
Loans acquired with deteriorated credit quality	0	0
Total Allowance for Loan Losses	155	106	$ 105	$ 122
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	22,781	20,509
Loans acquired with deteriorated credit quality	0	0
Total Loans	$ 22,781	$ 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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The balance of financing receivables that were individually 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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- Definition

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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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