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FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets    
Debt securities held to maturity $ 659,471 $ 675,053
Restricted bank stock 77,006 49,930
Portfolio loans, net 13,424,085 7,613,683
Financial liabilities    
Junior subordinated debt owed to unconsolidated trusts 77,257 74,815
Level 1 Inputs | Carrying Amount    
Financial assets    
Cash and cash equivalents 385,474 697,659
Level 1 Inputs | Fair Value    
Financial assets    
Cash and cash equivalents 385,474 697,659
Level 2 Inputs | Carrying Amount    
Financial assets    
Debt securities held to maturity 784,821 826,630
Loans held for sale 8,943 3,657
Restricted bank stock 77,006 49,930
Accrued interest receivable 79,578 45,141
Financial liabilities    
Time deposits 2,433,788 1,490,635
Securities sold under agreements to repurchase 147,152 155,610
Long-term borrowings 92,431 0
Junior subordinated debt owed to unconsolidated trusts 77,257 74,815
Accrued interest payable 24,355 21,129
Level 2 Inputs | Fair Value    
Financial assets    
Debt securities held to maturity 659,471 675,053
Loans held for sale 8,993 3,726
Restricted bank stock 77,006 49,930
Accrued interest receivable 79,578 45,141
Financial liabilities    
Time deposits 2,428,428 1,481,591
Securities sold under agreements to repurchase 147,152 155,610
Long-term borrowings 92,452 0
Junior subordinated debt owed to unconsolidated trusts 71,478 67,314
Accrued interest payable 24,355 21,129
Level 3 Inputs | Carrying Amount    
Financial assets    
Portfolio loans, net 13,424,085 7,613,683
Mortgage servicing rights 1,441 1,304
Other servicing rights 2,274 1,482
Level 3 Inputs | Fair Value    
Financial assets    
Portfolio loans, net 13,505,193 7,426,158
Mortgage servicing rights 5,260 5,627
Other servicing rights 2,315 1,591
Level 3 Inputs | Subordinated Debt | Carrying Amount    
Financial liabilities    
Long-term borrowings 103,283 227,723
Level 3 Inputs | Subordinated Debt | Fair Value    
Financial liabilities    
Long-term borrowings $ 98,490 $ 219,043