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FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 670,532 | $ 675,053
Restricted bank stock | 77,112 | 49,930
Portfolio loans, net | 13,625,285 | 7,613,683
Financial liabilities |  |
Junior subordinated debt owed to unconsolidated trusts | 77,187 | 74,815
Carrying Amount |  |
Financial assets |  |
Restricted bank stock | 77,112 | 49,930
Level 1 Inputs | Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 752,352 | 697,659
Level 1 Inputs | Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 752,352 | 697,659
Level 2 Inputs | Carrying Amount |  |
Financial assets |  |
Debt securities held to maturity | 802,965 | 826,630
Loans held for sale | 10,497 | 3,657
Accrued interest receivable | 79,169 | 45,141
Financial liabilities |  |
Time deposits | 2,632,456 | 1,490,635
Securities sold under agreements to repurchase | 158,030 | 155,610
Long-term debt | 86,557 | 0
Junior subordinated debt owed to unconsolidated trusts | 77,187 | 74,815
Accrued interest payable | 29,896 | 21,129
Level 2 Inputs | Fair Value |  |
Financial assets |  |
Debt securities held to maturity | 670,532 | 675,053
Loans held for sale | 10,594 | 3,726
Restricted bank stock | 77,112 | 49,930
Accrued interest receivable | 79,169 | 45,141
Financial liabilities |  |
Time deposits | 2,623,126 | 1,481,591
Securities sold under agreements to repurchase | 158,030 | 155,610
Long-term debt | 86,425 | 0
Junior subordinated debt owed to unconsolidated trusts | 71,089 | 67,314
Accrued interest payable | 29,896 | 21,129
Level 3 Inputs | Carrying Amount |  |
Financial assets |  |
Portfolio loans, net | 13,625,285 | 7,613,683
Mortgage servicing rights | 1,314 | 1,304
Other servicing rights | 2,472 | 1,482
Level 3 Inputs | Fair Value |  |
Financial assets |  |
Portfolio loans, net | 13,687,223 | 7,426,158
Mortgage servicing rights | 5,455 | 5,627
Other servicing rights | 2,701 | 1,591
Level 3 Inputs | Subordinated Debt | Carrying Amount |  |
Financial liabilities |  |
Long-term debt | 103,169 | 227,723
Level 3 Inputs | Subordinated Debt | Fair Value |  |
Financial liabilities |  |
Long-term debt | $ 96,480 | $ 219,043

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