v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial assets    
Debt securities held to maturity $ 579,303 $ 625,957
Restricted bank stock 83,171 77,006
Portfolio loans, net 13,030,950 13,393,776
Financial liabilities    
Junior subordinated debt owed to unconsolidated trusts 62,473 77,328
Level 1 Inputs | Carrying Amount    
Financial assets    
Cash and cash equivalents 665,373 280,227
Level 1 Inputs | Fair Value    
Financial assets    
Cash and cash equivalents 665,373 280,227
Level 2 Inputs | Carrying Amount    
Financial assets    
Interest-bearing time deposits in other banks 14,450 13,825
Debt securities held to maturity 703,988 746,385
Loans held for sale 8,660 5,752
Restricted bank stock 83,171 77,006
Accrued interest receivable 72,758 71,788
Financial liabilities    
Time deposits 2,382,306 2,429,890
Securities sold under agreements to repurchase 144,061 166,929
Short-term borrowings 28,333 0
Junior subordinated debt owed to unconsolidated trusts 62,473 77,328
Accrued interest payable 19,018 25,372
Level 2 Inputs | Carrying Amount | Long-term borrowings    
Financial liabilities    
Long-term borrowings and subordinated notes, net of unamortized issuance costs 95,325 113,806
Level 2 Inputs | Fair Value    
Financial assets    
Interest-bearing time deposits in other banks 12,491 11,880
Debt securities held to maturity 579,303 625,957
Loans held for sale 8,729 5,886
Restricted bank stock 83,171 77,006
Accrued interest receivable 72,758 71,788
Financial liabilities    
Time deposits 2,373,388 2,425,290
Securities sold under agreements to repurchase 144,061 166,929
Short-term borrowings 28,092 0
Junior subordinated debt owed to unconsolidated trusts 58,363 71,407
Accrued interest payable 19,018 25,372
Level 2 Inputs | Fair Value | Long-term borrowings    
Financial liabilities    
Long-term borrowings and subordinated notes, net of unamortized issuance costs 94,562 113,853
Level 3 Inputs | Carrying Amount    
Financial assets    
Portfolio loans, net 13,030,950 13,393,776
Mortgage servicing rights 1,500 1,459
Other servicing rights 1,985 2,086
Level 3 Inputs | Carrying Amount | Subordinated Debt    
Financial liabilities    
Long-term borrowings and subordinated notes, net of unamortized issuance costs 99,603 99,395
Level 3 Inputs | Fair Value    
Financial assets    
Portfolio loans, net 12,866,338 13,472,907
Mortgage servicing rights 5,818 5,176
Other servicing rights 2,222 2,193
Level 3 Inputs | Fair Value | Subordinated Debt    
Financial liabilities    
Long-term borrowings and subordinated notes, net of unamortized issuance costs $ 98,250 $ 94,500