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FAIR VALUE MEASUREMENTS - Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets
Debt securities held to maturity	$ 713,031	$ 730,397
Portfolio loans, net	7,496,515	7,559,294
Financial liabilities
Short-term borrowings	0	12,000
Junior subordinated debt owed to unconsolidated trusts	72,040	71,993
Level 1 Inputs | Carrying Amount
Financial assets
Cash and cash equivalents	591,071	719,581
Level 1 Inputs | Fair Value
Financial assets
Cash and cash equivalents	591,071	719,581
Level 2 Inputs | Carrying Amount
Financial assets
Debt securities held to maturity	862,218	872,628
Loans held for sale	6,827	2,379
Accrued interest receivable	46,530	45,288
Financial liabilities
Time deposits	1,577,178	1,819,274
Securities sold under agreements to repurchase	147,175	187,396
Short-term borrowings	0	12,000
Long-term debt	0	18,000
Junior subordinated debt owed to unconsolidated trusts	72,040	71,993
Accrued interest payable	26,707	28,418
Level 2 Inputs | Fair Value
Financial assets
Debt securities held to maturity	713,031	730,397
Loans held for sale	6,834	2,401
Accrued interest receivable	46,530	45,288
Financial liabilities
Time deposits	1,559,643	1,804,905
Securities sold under agreements to repurchase	147,175	187,396
Short-term borrowings	0	12,034
Long-term debt	0	18,020
Junior subordinated debt owed to unconsolidated trusts	58,776	57,153
Accrued interest payable	26,707	28,418
Level 3 Inputs | Carrying Amount
Financial assets
Portfolio loans, net	7,496,515	7,559,294
Mortgage servicing rights	989	3,289
Other servicing rights	1,573	1,597
Level 3 Inputs | Fair Value
Financial assets
Portfolio loans, net	7,293,871	7,276,905
Mortgage servicing rights	5,468	18,079
Other servicing rights	2,008	2,062
Level 3 Inputs | Subordinated Debt | Carrying Amount
Financial liabilities
Long-term debt	223,100	222,882
Level 3 Inputs | Subordinated Debt | Fair Value
Financial liabilities
Long-term debt	$ 204,750	$ 200,000

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