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FAIR VALUE OF ASSETS AND LIABILITIES (Carrying Amount and Estimated Fair Value of Financial Instruments) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financial assets
Cash and due from financial institutions	$ 78,418,000	$ 80,569,000
Interest-bearing deposits in other financial institutions	24,554,000	21,617,000
Loans held for sale	9,083,000	6,647,000
Federal Home Loan Bank (FHLB) stock	14,983,000	16,645,000
Accrued interest receivable	16,500,000	17,000,000
Financial liabilities
Noninterest-bearing demand	1,450,532,000	1,436,967,000
Time deposits	1,026,453,000	1,107,255,000
Transfers of financial assets from Level 1 to Level 2	0
Transfers of financial assets from Level 2 to Level 1	0
Transfers of financial liabilities from Level 1 to Level 2	0
Transfers of financial liabilities from Level 2 to Level 1	0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Cash and due from financial institutions	78,418,000	80,569,000
Interest-bearing deposits in other financial institutions	24,554,000	21,617,000
Investment securities	1,127,000	826,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	0	0
Loans and leases, net of Allowance	0	0
Accrued interest receivable	16,500,000	17,000,000
Financial liabilities
Noninterest-bearing demand	1,450,532,000	1,436,967,000
Interest-bearing demand and savings deposits	2,643,038,000	2,402,268,000
Time deposits	0	0
FHLB advances and other short-term borrowings	0	0
Long-term debt	0	0
Accrued interest payable (included in other liabilities)	4,288,000	5,051,000
Significant Other Observable Inputs (Level 2)
Financial assets
Cash and due from financial institutions	0	0
Interest-bearing deposits in other financial institutions	0	0
Investment securities	1,115,728,000	1,338,581,000
Loans held for sale	9,083,000	6,647,000
Loans and leases, net of Allowance	0	0
Accrued interest receivable	0	0
Financial liabilities
Noninterest-bearing demand	0	0
Interest-bearing demand and savings deposits	0	0
Time deposits	0	0
FHLB advances and other short-term borrowings	150,000,000	197,000,000
Long-term debt	97,827,000	118,057,000
Accrued interest payable (included in other liabilities)	0	0
Significant Unobservable Inputs (Level 3)
Financial assets
Cash and due from financial institutions	0	0
Interest-bearing deposits in other financial institutions	0	0
Investment securities	11,255,000	11,169,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	0	0
Loans and leases, net of Allowance	4,392,477,000	3,938,380,000
Accrued interest receivable	0	0
Financial liabilities
Noninterest-bearing demand	0	0
Interest-bearing demand and savings deposits	0	0
Time deposits	1,023,362,000	1,099,560,000
FHLB advances and other short-term borrowings	0	0
Long-term debt	0	0
Accrued interest payable (included in other liabilities)	0	0
Carrying Amount
Financial assets
Cash and due from financial institutions	78,418,000	80,569,000
Interest-bearing deposits in other financial institutions	24,554,000	21,617,000
Investment securities	1,128,110,000	1,354,812,000
Loans held for sale	9,083,000	6,647,000
Loans and leases, net of Allowance	4,401,569,000	4,030,450,000
Federal Home Loan Bank (FHLB) stock		16,645,000
Accrued interest receivable	16,500,000	17,000,000
Financial liabilities
Noninterest-bearing demand	1,450,532,000	1,436,967,000
Interest-bearing demand and savings deposits	2,643,038,000	2,402,268,000
Time deposits	1,026,453,000	1,107,255,000
FHLB advances and other short-term borrowings	150,000,000	197,000,000
Long-term debt	101,547,000	122,166,000
Accrued interest payable (included in other liabilities)	4,288,000	5,051,000
Estimated Fair Value
Financial assets
Cash and due from financial institutions	78,418,000	80,569,000
Interest-bearing deposits in other financial institutions	24,554,000	21,617,000
Investment securities	1,128,110,000	1,350,576,000
Loans held for sale	9,083,000	6,647,000
Loans and leases, net of Allowance	4,392,477,000	3,938,380,000
Accrued interest receivable	16,500,000	17,000,000
Financial liabilities
Noninterest-bearing demand	1,450,532,000	1,436,967,000
Interest-bearing demand and savings deposits	2,643,038,000	2,402,268,000
Time deposits	1,023,362,000	1,099,560,000
FHLB advances and other short-term borrowings	150,000,000	197,000,000
Long-term debt	97,827,000	118,057,000
Accrued interest payable (included in other liabilities)	4,288,000	5,051,000
Commitments to extend credit
Financial liabilities
Off-balance sheet financial instruments:	1,089,135,000	1,030,322,000
Commitments to extend credit | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities
Off-balance sheet financial instruments:	0	0
Commitments to extend credit | Significant Other Observable Inputs (Level 2)
Financial liabilities
Off-balance sheet financial instruments:	1,230,000	1,205,000
Commitments to extend credit | Significant Unobservable Inputs (Level 3)
Financial liabilities
Off-balance sheet financial instruments:	0	0
Commitments to extend credit | Carrying Amount
Financial liabilities
Off-balance sheet financial instruments:	1,230,000	1,205,000
Commitments to extend credit | Estimated Fair Value
Financial liabilities
Off-balance sheet financial instruments:	1,230,000	1,205,000
Standby letters of credit and financial guarantees written
Financial liabilities
Off-balance sheet financial instruments:	10,526,000	13,377,000
Standby letters of credit and financial guarantees written | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities
Off-balance sheet financial instruments:	0	0
Standby letters of credit and financial guarantees written | Significant Other Observable Inputs (Level 2)
Financial liabilities
Off-balance sheet financial instruments:	158,000	201,000
Standby letters of credit and financial guarantees written | Significant Unobservable Inputs (Level 3)
Financial liabilities
Off-balance sheet financial instruments:	0	0
Standby letters of credit and financial guarantees written | Carrying Amount
Financial liabilities
Off-balance sheet financial instruments:	158,000	201,000
Standby letters of credit and financial guarantees written | Estimated Fair Value
Financial liabilities
Off-balance sheet financial instruments:	158,000	201,000
Interest rate options
Financial liabilities
Derivative, Notional Amount	625,000	2,158,000
Interest rate options | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities
Financial Liabilities Fair Value Disclosure	0	0
Interest rate options | Significant Other Observable Inputs (Level 2)
Financial liabilities
Financial Liabilities Fair Value Disclosure	8,000	11,000
Interest rate options | Significant Unobservable Inputs (Level 3)
Financial liabilities
Financial Liabilities Fair Value Disclosure	0	0
Interest rate options | Carrying Amount
Financial liabilities
Financial Liabilities Fair Value Disclosure	8,000	11,000
Interest rate options | Estimated Fair Value
Financial liabilities
Financial Liabilities Fair Value Disclosure	8,000	11,000
Forward interest rate contracts
Financial liabilities
Derivative, Notional Amount	8,968,000	8,530,000
Recurring basis | Forward interest rate contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial liabilities
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31)	0	0
Recurring basis | Forward interest rate contracts | Significant Other Observable Inputs (Level 2)
Financial liabilities
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31)	(28,000)	(95,000)
Recurring basis | Forward interest rate contracts | Significant Unobservable Inputs (Level 3)
Financial liabilities
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31)	0	0
Recurring basis | Forward interest rate contracts | Carrying Amount
Financial liabilities
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31)	(28,000)	(95,000)
Recurring basis | Forward interest rate contracts | Estimated Fair Value
Financial liabilities
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31)	$ (28,000)	$ (95,000)

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