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FAIR VALUE - CARRYING AMOUNTS AND FV OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Assets:
Available-for-sale debt securities	$ 880,921	$ 884,693
Held-to-maturity debt securities	4,775	4,929
Equity securities with a readily determinable fair value	945	945
Mortgage loans held for sale, at fair value	12,953	7,516	$ 9,140	$ 8,312
Consumer loans held for sale, at fair value	9,430	10,968	$ 8,602	$ 5,443
Carrying Value
Assets:
Cash and cash equivalents	599,105	219,972
Available-for-sale debt securities	880,921	884,693
Held-to-maturity debt securities	4,775	4,944
Equity securities with a readily determinable fair value	945	945
Mortgage loans held for sale, at fair value	12,953	7,516
Consumer loans held for sale, at fair value	9,430	10,968
Loans held for sale, at the lower of cost or fair value	19,399	17,027
Other loans held for sale, at the lower of cost or fair value		81,839
Loans, net	5,275,133	5,360,977
Federal Home Loan Bank stock	27,014	32,114
Accrued interest receivable	21,261	22,291
Mortgage servicing rights	6,693	6,811
Rate lock commitments	358	279
Mandatory forward contracts	400
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	81,337	88,504
Federal Home Loan Bank advances	366,500	506,000
Accrued interest payable	4,258	3,288
Mandatory forward contracts		29
Carrying Value | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	5,116	6,321
Liabilities:
Interest rate swap agreements	5,116	6,321
Carrying Value | FHLB Advances
Liabilities:
Interest rate swap agreements	1,855	2,674
Carrying Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,275,427	1,173,461
Carrying Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,549,914	3,378,084
Carrying Value | Time deposits
Liabilities:
Deposit liabilities, fair value	683,779	651,602
Total Fair Value
Assets:
Cash and cash equivalents	599,105	219,972
Available-for-sale debt securities	880,921	884,693
Held-to-maturity debt securities	4,775	4,929
Equity securities with a readily determinable fair value	945	945
Mortgage loans held for sale, at fair value	12,953	7,516
Consumer loans held for sale, at fair value	9,430	10,968
Loans held for sale, at the lower of cost or fair value	19,489	17,124
Other loans held for sale, at the lower of cost or fair value		82,837
Loans, net	5,243,154	5,332,160
Accrued interest receivable	21,261	22,291
Mortgage servicing rights	17,702	17,432
Rate lock commitments	358	279
Mandatory forward contracts	400
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	81,337	88,504
Federal Home Loan Bank advances	365,324	508,892
Accrued interest payable	4,258	3,288
Mandatory forward contracts		29
Total Fair Value | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	5,116	6,321
Liabilities:
Interest rate swap agreements	5,116	6,321
Total Fair Value | FHLB Advances
Liabilities:
Interest rate swap agreements	1,855	2,674
Total Fair Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,275,427	1,173,461
Total Fair Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,549,914	3,378,084
Total Fair Value | Time deposits
Liabilities:
Deposit liabilities, fair value	686,716	652,942
Total Fair Value | Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	599,105	219,972
Available-for-sale debt securities	34,859	34,854
Total Fair Value | Fair Value, Inputs, Level 2
Assets:
Available-for-sale debt securities	841,990	844,338
Held-to-maturity debt securities	4,775	4,929
Equity securities with a readily determinable fair value	945	945
Mortgage loans held for sale, at fair value	12,953	7,516
Accrued interest receivable	21,261	22,291
Mortgage servicing rights	17,702	17,432
Rate lock commitments	358	279
Mandatory forward contracts	400
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	81,337	88,504
Federal Home Loan Bank advances	365,324	508,892
Accrued interest payable	4,258	3,288
Mandatory forward contracts		29
Total Fair Value | Fair Value, Inputs, Level 2 | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	5,116	6,321
Liabilities:
Interest rate swap agreements	5,116	6,321
Total Fair Value | Fair Value, Inputs, Level 2 | FHLB Advances
Liabilities:
Interest rate swap agreements	1,855	2,674
Total Fair Value | Fair Value, Inputs, Level 2 | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,275,427	1,173,461
Total Fair Value | Fair Value, Inputs, Level 2 | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,549,914	3,378,084
Total Fair Value | Fair Value, Inputs, Level 2 | Time deposits
Liabilities:
Deposit liabilities, fair value	686,716	652,942
Total Fair Value | Fair Value, Inputs, Level 3
Assets:
Available-for-sale debt securities	4,072	5,501
Consumer loans held for sale, at fair value	9,430	10,968
Loans held for sale, at the lower of cost or fair value	19,489	17,124
Other loans held for sale, at the lower of cost or fair value		82,837
Loans, net	$ 5,243,154	$ 5,332,160

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