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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value Recurring Basis | The following tables summarize financial assets and financial liabilities measured at fair value on a recurring basis at December 31, 2025 and 2024, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value ($ in thousands). There were no transfers between fair value levels for the years ended December 31, 2025 and 2024.
|  | December 31, 2025 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
U.S. Treasury securities |  | $ | 208,948 |  |  | $ | 208,948 |  |  | $ | — |  |  | $ | — |
U.S. Government agency obligations |  |  | 70,849 |  |  |  | — |  |  |  | 70,849 |  |  |  | — |
Mortgage-backed securities |  |  | 1,597,033 |  |  |  | — |  |  |  | 1,597,033 |  |  |  | — |
Securities available for sale |  |  | 1,876,830 |  |  |  | 208,948 |  |  |  | 1,667,882 |  |  |  | — |
LHFS |  |  | 278,789 |  |  |  | — |  |  |  | 278,789 |  |  |  | — |
MSR |  |  | 131,289 |  |  |  | — |  |  |  | — |  |  |  | 131,289 |
Other assets - derivatives |  |  | 16,235 |  |  |  | 11 |  |  |  | 15,226 |  |  |  | 998 |
Other liabilities - derivatives |  |  | 22,832 |  |  |  | 1,708 |  |  |  | 21,124 |  |  |  | — |
|  | December 31, 2024 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
U.S. Treasury securities |  | $ | 202,669 |  |  | $ | 202,669 |  |  | $ | — |  |  | $ | — |
U.S. Government agency obligations |  |  | 38,807 |  |  |  | — |  |  |  | 38,807 |  |  |  | — |
Mortgage-backed securities |  |  | 1,451,058 |  |  |  | — |  |  |  | 1,451,058 |  |  |  | — |
Securities available for sale |  |  | 1,692,534 |  |  |  | 202,669 |  |  |  | 1,489,865 |  |  |  | — |
LHFS |  |  | 200,307 |  |  |  | — |  |  |  | 200,307 |  |  |  | — |
MSR |  |  | 139,317 |  |  |  | — |  |  |  | — |  |  |  | 139,317 |
Other assets - derivatives |  |  | 15,397 |  |  |  | 18 |  |  |  | 15,150 |  |  |  | 229 |
Other liabilities - derivatives |  |  | 41,355 |  |  |  | 2,183 |  |  |  | 39,172 |  |  |  | — |
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis | The changes in Level 3 assets measured at fair value on a recurring basis for the years ended December 31, 2025 and 2024 are summarized as follows ($ in thousands):
|  | MSR |  |  | Other Assets - Derivatives |
Balance, January 1, 2025 |  | $ | 139,317 |  |  | $ | 229 |
Total net (loss) gain included in Mortgage banking, net (1) |  |  | (23,080 | ) |  |  | 4,234 |
Additions |  |  | 15,052 |  |  |  | — |
Sales |  |  | — |  |  |  | (3,465 | )
Balance, December 31, 2025 |  | $ | 131,289 |  |  | $ | 998 |
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at December 31, 2025 |  | $ | (9,840 | ) |  | $ | 5,049 |
Balance, January 1, 2024 |  | $ | 131,870 |  |  | $ | 845 |
Total net (loss) gain included in Mortgage banking, net (1) |  |  | (5,844 | ) |  |  | 2,229 |
Additions |  |  | 13,291 |  |  |  | — |
Sales |  |  | — |  |  |  | (2,845 | )
Balance, December 31, 2024 |  | $ | 139,317 |  |  | $ | 229 |
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at December 31, 2024 |  | $ | 5,801 |  |  | $ | 1,681 |
(1) Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.
Carrying Amounts and Estimated Fair Values of Financial Instruments | The carrying amounts and estimated fair values of financial instruments at December 31, 2025 and 2024 were as follows ($ in thousands):
|  | December 31, 2025 |  |  | December 31, 2024 |
|  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Financial Assets: |  |  |  |  |  |  |  |  |  |  |  |
Level 2 Inputs: |  |  |  |  |  |  |  |  |  |  |  |
Cash and short-term investments |  | $ | 668,007 |  |  | $ | 668,007 |  |  | $ | 567,251 |  |  | $ | 567,251 |
Securities held to maturity |  |  | 1,207,454 |  |  |  | 1,180,569 |  |  |  | 1,335,385 |  |  |  | 1,259,107 |
Level 3 Inputs: |  |  |  |  |  |  |  |  |  |  |  |
Net LHFI |  |  | 13,517,162 |  |  |  | 13,544,873 |  |  |  | 12,929,672 |  |  |  | 12,886,168 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Level 2 Inputs: |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 15,499,784 |  |  |  | 15,494,681 |  |  |  | 15,108,175 |  |  |  | 15,098,854 |
Federal funds purchased and securities sold under repurchase agreements |  |  | 445,000 |  |  |  | 445,000 |  |  |  | 324,008 |  |  |  | 324,008 |
Other borrowings |  |  | 364,762 |  |  |  | 364,762 |  |  |  | 301,541 |  |  |  | 301,541 |
Subordinated notes |  |  | 171,966 |  |  |  | 176,750 |  |  |  | 123,702 |  |  |  | 120,625 |
Junior subordinated debt securities |  |  | 61,856 |  |  |  | 52,964 |  |  |  | 61,856 |  |  |  | 49,794 |
Fair Value and the Contractual Principal Outstanding of the LHFS | The following table provides information about the fair value and the contractual principal outstanding of the LHFS accounted for under the fair value option at December 31, 2025 and 2024 ($ in thousands):
|  | December 31, |
|  | 2025 |  |  | 2024 |
Fair value of LHFS |  | $ | 142,485 |  |  | $ | 102,676 |
LHFS contractual principal outstanding |  |  | 143,832 |  |  |  | 105,322 |
Fair value less unpaid principal |  | $ | (1,347 | ) |  | $ | (2,646 | )

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