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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

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