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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets:
| September 30, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (dollars in thousands)
Loans held for sale | $ | — |  |  | $ | 19,875 |  |  | $ | — |  |  | $ | 19,875 |
AFS investment securities: |  |  |  |  |  |  |
State and municipal securities | — |  |  | 811,736 |  |  | — |  |  | 811,736 |
Corporate debt securities | — |  |  | 255,039 |  |  | — |  |  | 255,039 |
Collateralized mortgage obligations | — |  |  | 1,135,442 |  |  | — |  |  | 1,135,442 |
Residential mortgage-backed securities | — |  |  | 858,992 |  |  | — |  |  | 858,992 |
Commercial mortgage-backed securities | — |  |  | 532,867 |  |  | — |  |  | 532,867 |
Total AFS investment securities | — |  |  | 3,594,076 |  |  | — |  |  | 3,594,076 |
Other assets: |  |  |  |  |  |  |
Investments held in Rabbi Trust | 39,004 |  |  | — |  |  | — |  |  | 39,004 |
Derivative assets | 1,179 |  |  | 128,620 |  |  | — |  |  | 129,799 |
Total assets | $ | 40,183 |  |  | $ | 3,742,571 |  |  | $ | — |  |  | $ | 3,782,754 |
Other liabilities: |  |  |  |  |  |  |
Deferred compensation liabilities | $ | 39,004 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,004 |
Derivative liabilities | 970 |  |  | 177,633 |  |  | — |  |  | 178,603 |
Total liabilities | $ | 39,974 |  |  | $ | 177,633 |  |  | $ | — |  |  | $ | 217,607 |
| December 31, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (dollars in thousands)
Loans held for sale | $ | — |  |  | $ | 25,618 |  |  | $ | — |  |  | $ | 25,618 |
AFS investment securities: |  |  |  |  |  |  |
State and municipal securities | — |  |  | 814,887 |  |  | — |  |  | 814,887 |
Corporate debt securities | — |  |  | 300,370 |  |  | — |  |  | 300,370 |
Collateralized mortgage obligations | — |  |  | 788,885 |  |  | — |  |  | 788,885 |
Residential mortgage-backed securities | — |  |  | 989,875 |  |  | — |  |  | 989,875 |
Commercial mortgage-backed securities | — |  |  | 516,882 |  |  | — |  |  | 516,882 |
Total AFS investment securities | — |  |  | 3,410,899 |  |  | — |  |  | 3,410,899 |
Other assets: |  |  |  |  |  |  |
Investments held in Rabbi Trust | 35,093 |  |  | — |  |  | — |  |  | 35,093 |
Derivative assets | 1,682 |  |  | 159,939 |  |  | — |  |  | 161,621 |
Total assets | $ | 36,775 |  |  | $ | 3,596,456 |  |  | $ | — |  |  | $ | 3,633,231 |
Other liabilities: |  |  |  |  |  |  |
Deferred compensation liabilities | $ | 35,093 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,093 |
Derivative liabilities | 1,596 |  |  | 252,821 |  |  | — |  |  | 254,417 |
Total liabilities | $ | 36,689 |  |  | $ | 252,821 |  |  | $ | — |  |  | $ | 289,510 |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis | The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis:
| September 30, 2025 |  | December 31, 2024
| (dollars in thousands)
Loans, Net | $ | 132,833 |  |  | $ | 168,668 |
OREO | 2,305 |  |  | 2,621 |
MSRs(1) | 50,731 |  |  | 53,972 |
SBA servicing asset | 2,495 |  |  | 3,120 |
Total assets | $ | 188,364 |  |  | $ | 228,381 |
(1) Amounts shown are estimated fair value. MSRs are recorded on the Corporation's Consolidated Balance Sheets at the lower of amortized cost or fair value. See "Note 6 - Mortgage Servicing Rights" for additional information.
Details of Book Value and Fair Value of Financial Instruments | The following tables detail the book values and the estimated fair values of the Corporation's financial instruments:
| September 30, 2025
|  | Estimated Fair Value
| Carrying Amount | Level 1 | Level 2 | Level 3 | Total
| (dollars in thousands)
FINANCIAL ASSETS |  |  |  |  |
Cash and cash equivalents | $ | 814,197 |  | $ | 814,197 |  | $ | — |  | $ | — |  | $ | 814,197 |
FRB and FHLB stock | 136,181 |  | — |  | 136,181 |  | — |  | 136,181 |
Loans held for sale | 19,875 |  | — |  | 19,875 |  | — |  | 19,875 |
AFS investment securities | 3,594,076 |  | — |  | 3,594,076 |  | — |  | 3,594,076 |
HTM investment securities | 1,451,194 |  | — |  | 1,285,350 |  | — |  | 1,285,350 |
Loans, net | 23,665,231 |  | — |  | — |  | 22,658,165 |  | 22,658,165 |
Accrued interest receivable | 114,003 |  | 114,003 |  | — |  | — |  | 114,003 |
Other assets | 723,378 |  | 556,827 |  | 131,831 |  | 55,531 |  | 744,189 |
FINANCIAL LIABILITIES |  |  |  |  |
Demand and savings deposits | $ | 21,589,281 |  | $ | 21,589,281 |  | $ | — |  | $ | — |  | $ | 21,589,281 |
Brokered deposits | 709,667 |  | 73,980 |  | 635,766 |  | — |  | 709,746 |
Time deposits | 4,033,542 |  | — |  | 4,029,096 |  | — |  | 4,029,096 |
Accrued interest payable | 22,583 |  | 22,583 |  | — |  | — |  | 22,583 |
FHLB advances | 450,000 |  | 452,489 |  | — |  | — |  | 452,489 |
Senior debt and subordinated debt | 367,557 |  | — |  | 357,016 |  | — |  | 357,016 |
Other borrowings | 654,404 |  | 635,717 |  | 985 |  | — |  | 636,702 |
Other liabilities | 394,603 |  | 202,396 |  | 177,633 |  | 14,575 |  | 394,604 |
| December 31, 2024
|  | Estimated Fair Value
| Carrying Amount | Level 1 | Level 2 | Level 3 | Total
| (dollars in thousands)
FINANCIAL ASSETS |  |  |  |  |
Cash and cash equivalents | $ | 1,063,871 |  | $ | 1,063,871 |  | $ | — |  | $ | — |  | $ | 1,063,871 |
FRB and FHLB stock | 139,574 |  | — |  | 139,574 |  | — |  | 139,574 |
Loans held for sale | 25,618 |  | — |  | 25,618 |  | — |  | 25,618 |
AFS investment securities | 3,410,899 |  | — |  | 3,410,899 |  | — |  | 3,410,899 |
HTM investment securities | 1,395,569 |  | — |  | 1,183,449 |  | — |  | 1,183,449 |
Loans, net | 23,665,763 |  | — |  | — |  | 22,555,687 |  | 22,555,687 |
Accrued interest receivable | 117,029 |  | 117,029 |  | — |  | — |  | 117,029 |
Other assets | 736,502 |  | 543,251 |  | 159,939 |  | 59,713 |  | 762,903 |
FINANCIAL LIABILITIES |  |  |  |  |
Demand and savings deposits | $ | 21,135,478 |  | $ | 21,135,478 |  | $ | — |  | $ | — |  | $ | 21,135,478 |
Brokered deposits | 843,857 |  | 145,056 |  | 698,647 |  | — |  | 843,703 |
Time deposits | 4,150,098 |  | — |  | 4,154,726 |  | — |  | 4,154,726 |
Accrued interest payable | 31,620 |  | 31,620 |  | — |  | — |  | 31,620 |
FHLB advances | 850,000 |  | 851,470 |  | — |  | — |  | 851,470 |
Senior debt and subordinated debt | 367,316 |  | — |  | 253,818 |  | — |  | 253,818 |
Other borrowings | 564,732 |  | 544,908 |  | 901 |  | — |  | 545,809 |
Other liabilities | 467,011 |  | 200,029 |  | 252,821 |  | 14,161 |  | 467,011 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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