FAIR VALUE OF FINANCIAL ASSETS AND FINANCIAL LIABILITIES (Carrying Amount and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial assets:
Cash and due from financial institutions	$ 88,200	$ 77,774
Interest-bearing deposits in other financial institutions	290,453	303,167
Investment securities	1,244,057
Loans held for sale	1,084	5,662
Mortgage servicing rights, net	8,672	8,473
Accrued interest receivable	23,559	23,378
Financial liabilities:
Noninterest-bearing demand	1,891,198	1,888,937
Time	983,937	1,087,185
Accrued interest payable	7,068	10,051
Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial assets:
Cash and due from financial institutions	88,200	77,774
Interest-bearing deposits in other financial institutions	290,453	303,167
Investment securities	61,291	59,498
Loans held for sale	0	0
Loans, net of ACL	0	0
Mortgage servicing rights, net	0	0
Accrued interest receivable	651	462
Financial liabilities:
Noninterest-bearing demand	1,891,198	1,888,937
Interest-bearing demand and savings and money market	3,734,629	3,667,889
Time	0	0
Long-term debt	0	0
Accrued interest payable	102	113
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	1,176,050	1,177,994
Loans held for sale	1,084	5,662
Loans, net of ACL	0	0
Mortgage servicing rights, net	0	0
Accrued interest receivable	4,075	4,607
Financial liabilities:
Noninterest-bearing demand	0	0
Interest-bearing demand and savings and money market	0	0
Time	0	0
Long-term debt	0	0
Accrued interest payable	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	6,716	6,847
Loans held for sale	0	0
Loans, net of ACL	5,016,971	4,916,765
Mortgage servicing rights, net	11,301	12,387
Accrued interest receivable	18,833	18,309
Financial liabilities:
Noninterest-bearing demand	0	0
Interest-bearing demand and savings and money market	0	0
Time	978,868	1,079,275
Long-term debt	73,579	153,760
Accrued interest payable	6,966	9,938
Carrying Amount
Financial assets:
Cash and due from financial institutions	88,200	77,774
Interest-bearing deposits in other financial institutions	290,453	303,167
Investment securities	1,310,603	1,334,588
Loans held for sale	1,084	5,662
Loans, net of ACL	5,289,096	5,332,852
Mortgage servicing rights, net	8,672	8,473
Accrued interest receivable	23,559	23,378
Financial liabilities:
Noninterest-bearing demand	1,891,198	1,888,937
Interest-bearing demand and savings and money market	3,734,629	3,667,889
Time	983,937	1,087,185
Long-term debt	76,547	156,345
Accrued interest payable	7,068	10,051
Estimated Fair Value
Financial assets:
Cash and due from financial institutions	88,200	77,774
Interest-bearing deposits in other financial institutions	290,453	303,167
Investment securities	1,244,057	1,244,339
Loans held for sale	1,084	5,662
Loans, net of ACL	5,016,971	4,916,765
Mortgage servicing rights, net	11,301	12,387
Accrued interest receivable	23,559	23,378
Financial liabilities:
Noninterest-bearing demand	1,891,198	1,888,937
Interest-bearing demand and savings and money market	3,734,629	3,667,889
Time	978,868	1,079,275
Long-term debt	73,579	153,760
Accrued interest payable	7,068	10,051
Commitments to Extend Credit
Financial liabilities:
Off-balance sheet financial instruments, Notional Amount	1,337,099	1,219,537
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:	1,063	1,167
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:	0	0
Commitments to Extend Credit | Estimated Fair Value
Financial liabilities:
Off-balance sheet financial instruments:	1,063	1,167
Standby letters of credit and financial guarantees written
Financial liabilities:
Off-balance sheet financial instruments, Notional Amount	2,624	2,702
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:	39	41
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:	0	0
Standby letters of credit and financial guarantees written | Estimated Fair Value
Financial liabilities:
Off-balance sheet financial instruments:	39	41
Assets
Financial liabilities:
Notional Amount	(60,660)	(50,202)
Assets	3,045	3,840
Assets | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure	0	0
Assets	0	0
Assets | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure	(3,045)	0
Assets	3,045	0
Assets | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure	0	(3,840)
Assets	0	3,840
Assets | Carrying Amount
Financial liabilities:
Liabilities, fair value disclosure	(3,045)	(3,840)
Assets | Estimated Fair Value
Financial liabilities:
Liabilities, fair value disclosure	(3,045)	(3,840)
Liabilities
Financial liabilities:
Notional Amount	(60,660)	(50,202)
Liabilities, fair value disclosure	(3,045)	(3,840)
Liabilities | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure	0	0
Liabilities | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure	(3,045)	0
Liabilities | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure	0	(3,840)
Forward interest rate contracts
Financial liabilities:
Notional Amount	(1,095)	(4,909)
Risk participation agreements
Financial liabilities:
Notional Amount	(52,435)	(35,183)
Interest rate options
Financial liabilities:
Notional Amount		(469)
Interest rate options | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure		0
Interest rate options | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure		(4)
Interest rate options | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure		0
Interest rate options | Carrying Amount
Financial liabilities:
Liabilities, fair value disclosure		(4)
Interest rate options | Estimated Fair Value
Financial liabilities:
Liabilities, fair value disclosure		(4)
Interest rate swap
Financial liabilities:
Notional Amount	(114,580)	(115,545)
Interest rate swap | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure		0
Interest rate swap | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure		(8,382)
Interest rate swap | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure		0
Interest rate swap | Carrying Amount
Financial liabilities:
Liabilities, fair value disclosure		(8,382)
Interest rate swap | Estimated Fair Value
Financial liabilities:
Liabilities, fair value disclosure		(8,382)
Recurring basis | Forward interest rate contracts | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure	0
Assets		0
Recurring basis | Forward interest rate contracts | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure	(4)
Assets		46
Recurring basis | Forward interest rate contracts | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure	0
Assets		0
Recurring basis | Forward interest rate contracts | Carrying Amount
Financial liabilities:
Liabilities, fair value disclosure	(4)
Assets		46
Recurring basis | Forward interest rate contracts | Estimated Fair Value
Financial liabilities:
Liabilities, fair value disclosure	(4)
Assets		46
Recurring basis | Risk participation agreements | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Liabilities, fair value disclosure	0
Assets		0
Recurring basis | Risk participation agreements | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Liabilities, fair value disclosure	(3)
Assets		0
Recurring basis | Risk participation agreements | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Liabilities, fair value disclosure	0
Assets		0
Recurring basis | Risk participation agreements | Carrying Amount
Financial liabilities:
Liabilities, fair value disclosure	(3)
Assets		0
Recurring basis | Risk participation agreements | Estimated Fair Value
Financial liabilities:
Liabilities, fair value disclosure	(3)
Assets		$ 0
Recurring basis | Interest rate swap | Quoted Prices in Active  Markets for  Identical Assets (Level 1)
Financial liabilities:
Assets	0
Recurring basis | Interest rate swap | Significant Other Observable Inputs (Level 2)
Financial liabilities:
Assets	4,163
Recurring basis | Interest rate swap | Significant Unobservable Inputs (Level 3)
Financial liabilities:
Assets	0
Recurring basis | Interest rate swap | Carrying Amount
Financial liabilities:
Assets	4,163
Recurring basis | Interest rate swap | Estimated Fair Value
Financial liabilities:
Assets	$ 4,163