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FAIR VALUE - CARRYING AMOUNTS AND FV OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Assets:
Available-for-sale debt securities	$ 843,171		$ 584,155
Held-to-maturity debt securities	5,087		10,735
Equity securities with readily determinable fair value	945		693
Mortgage loans held for sale, at fair value	15,338	$ 8,850	8,312	$ 8,526	$ 9,703	$ 3,227
Consumer loans held for sale, at fair value	8,444	8,312	5,443	6,080	8,341	7,914
Consumer loans held for sale, at the lower of cost or fair value	16,424	$ 19,640	18,632	$ 19,801	$ 23,860	$ 16,094
Carrying Value
Assets:
Cash and cash equivalents	484,238		432,151
Available-for-sale debt securities	843,171		584,155
Held-to-maturity debt securities	5,110		10,778
Equity securities with readily determinable fair value	945		693
Mortgage loans held for sale, at fair value	15,338		8,312
Consumer loans held for sale, at fair value	8,444		5,443
Consumer loans held for sale, at the lower of cost or fair value	16,424		18,632
Loans, net	5,201,509		5,347,488
Federal Home Loan Bank stock	25,849		24,478
Accrued interest receivable	20,797		20,128
Mortgage servicing rights	6,798		6,975
Rate lock commitments	475		223
Mandatory forward contracts	101		70
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	74,522		103,318
Federal Home Loan Bank advances	375,000		395,000
Accrued interest payable	4,483		5,153
Carrying Value | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	6,745		6,588
Liabilities:
Interest rate swap agreements	6,745		6,588
Carrying Value | FHLB Advances
Liabilities:
Interest rate swap agreements	2,907		647
Carrying Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,239,023		1,207,764
Carrying Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,442,646		3,231,738
Carrying Value | Time deposits
Liabilities:
Deposit liabilities, fair value	656,676		771,044
Total Fair Value
Assets:
Cash and cash equivalents	484,238		432,151
Available-for-sale debt securities	843,171		584,155
Held-to-maturity debt securities	5,087		10,735
Equity securities with readily determinable fair value	945		693
Mortgage loans held for sale, at fair value	15,338		8,312
Consumer loans held for sale, at fair value	8,444		5,443
Consumer loans held for sale, at the lower of cost or fair value	16,498		18,714
Loans, net	5,106,317		5,209,571
Accrued interest receivable	20,797		20,128
Mortgage servicing rights	16,941		17,159
Rate lock commitments	475		223
Mandatory forward contracts	101		70
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	74,522		103,318
Federal Home Loan Bank advances	379,059		395,814
Accrued interest payable	4,483		5,153
Total Fair Value | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	6,745		6,588
Liabilities:
Interest rate swap agreements	6,745		6,588
Total Fair Value | FHLB Advances
Liabilities:
Interest rate swap agreements	2,907		647
Total Fair Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,239,023		1,207,764
Total Fair Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,442,646		3,231,738
Total Fair Value | Time deposits
Liabilities:
Deposit liabilities, fair value	646,284		773,415
Total Fair Value | Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	484,238		432,151
Available-for-sale debt securities	34,750		84,775
Total Fair Value | Fair Value, Inputs, Level 2
Assets:
Available-for-sale debt securities	802,899		493,796
Held-to-maturity debt securities	5,087		10,735
Equity securities with readily determinable fair value	945		693
Mortgage loans held for sale, at fair value	15,338		8,312
Accrued interest receivable	20,797		20,128
Mortgage servicing rights	16,941		17,159
Rate lock commitments	475		223
Mandatory forward contracts	101		70
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	74,522		103,318
Federal Home Loan Bank advances	379,059		395,814
Accrued interest payable	4,483		5,153
Total Fair Value | Fair Value, Inputs, Level 2 | Bank clients and institutional swap dealer
Assets:
Interest rate swap agreements	6,745		6,588
Liabilities:
Interest rate swap agreements	6,745		6,588
Total Fair Value | Fair Value, Inputs, Level 2 | FHLB Advances
Liabilities:
Interest rate swap agreements	2,907		647
Total Fair Value | Fair Value, Inputs, Level 2 | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	1,239,023		1,207,764
Total Fair Value | Fair Value, Inputs, Level 2 | Transaction deposits
Liabilities:
Deposit liabilities, fair value	3,442,646		3,231,738
Total Fair Value | Fair Value, Inputs, Level 2 | Time deposits
Liabilities:
Deposit liabilities, fair value	646,284		773,415
Total Fair Value | Fair Value, Inputs, Level 3
Assets:
Available-for-sale debt securities	5,522		5,584
Consumer loans held for sale, at fair value	8,444		5,443
Consumer loans held for sale, at the lower of cost or fair value	16,498		18,714
Loans, net	$ 5,106,317		$ 5,209,571

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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