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FAIR VALUE MEASUREMENTS - Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial assets
Debt securities held to maturity	$ 730,397	$ 785,295
Portfolio loans, net	7,559,294	7,634,094
Mortgage servicing rights	1,500,000	1,700,000
Financial liabilities
Short-term borrowings	12,000	351,054
Junior subordinated debt owed to unconsolidated trusts	71,993	71,810
Level 1 Inputs | Carrying Amount
Financial assets
Cash and cash equivalents	719,581	227,164
Level 1 Inputs | Fair Value
Financial assets
Cash and cash equivalents	719,581	227,164
Level 2 Inputs | Carrying Amount
Financial assets
Debt securities held to maturity	872,628	918,312
Loans held for sale	2,379	1,253
Accrued interest receivable	45,288	43,372
Financial liabilities
Time deposits	1,819,274	855,375
Securities sold under agreements to repurchase	187,396	229,806
Short-term borrowings	12,000	351,054
Long-term debt	18,000	30,000
Junior subordinated debt owed to unconsolidated trusts	71,993	71,810
Accrued interest payable	28,418	3,978
Level 2 Inputs | Fair Value
Financial assets
Debt securities held to maturity	730,397	785,295
Loans held for sale	2,401	1,276
Accrued interest receivable	45,288	43,372
Financial liabilities
Time deposits	1,804,905	830,596
Securities sold under agreements to repurchase	187,396	229,806
Short-term borrowings	12,034	351,085
Long-term debt	18,020	30,052
Junior subordinated debt owed to unconsolidated trusts	57,153	59,111
Accrued interest payable	28,418	3,978
Level 3 Inputs | Carrying Amount
Financial assets
Portfolio loans, net	7,559,294	7,634,094
Mortgage servicing rights	3,289	5,861
Other servicing rights	1,597	1,914
Level 3 Inputs | Fair Value
Financial assets
Portfolio loans, net	7,276,905	7,320,422
Mortgage servicing rights	18,079	18,284
Other servicing rights	2,062	2,331
Level 3 Inputs | Subordinated Debt | Carrying Amount
Financial liabilities
Long-term debt	222,882	222,038
Level 3 Inputs | Subordinated Debt | Fair Value
Financial liabilities
Long-term debt	$ 200,000	$ 208,562

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