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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |
Schedule Of Carrying Value And Fair Value Of Financial Instruments Not Recorded At Fair Value |  | The following table presents estimated fair values of the Company's financial instruments as of December 31, 2023 and 2022, whether or not recognized or recorded at fair value on a recurring basis in the Consolidated Balance Sheets:
|  |  | December 31, 2023 |  | December 31, 2022
(in thousands) | Level |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 1 |  | $ | 2,162,534 |  |  | $ | 2,162,534 |  |  | $ | 1,294,643 |  |  | $ | 1,294,643 |
Equity and other investment securities | 1,2 |  | 76,995 |  |  | 76,995 |  |  | 72,959 |  |  | 72,959 |
Investment securities available for sale | 1,2 |  | 8,829,870 |  |  | 8,829,870 |  |  | 3,196,166 |  |  | 3,196,166 |
Investment securities held to maturity | 3 |  | 2,300 |  |  | 3,025 |  |  | 2,476 |  |  | 3,197 |
Loans held for sale | 2 |  | 30,715 |  |  | 30,715 |  |  | 71,647 |  |  | 71,647 |
Loans and leases, net | 2,3 |  | 37,001,080 |  |  | 35,810,989 |  |  | 25,854,846 |  |  | 24,399,370 |
Restricted equity securities | 1 |  | 179,274 |  |  | 179,274 |  |  | 47,144 |  |  | 47,144 |
Residential mortgage servicing rights | 3 |  | 109,243 |  |  | 109,243 |  |  | 185,017 |  |  | 185,017 |
Bank owned life insurance | 1 |  | 680,948 |  |  | 680,948 |  |  | 331,759 |  |  | 331,759 |
Derivatives | 2,3 |  | 38,085 |  |  | 38,085 |  |  | 15,444 |  |  | 15,444 |
Financial liabilities: |  |  |  |  |  |  |  |  |
Demand, money market, and savings deposits | 1 |  | $ | 35,379,451 |  |  | $ | 35,379,451 |  |  | $ | 24,355,381 |  |  | $ | 24,355,381 |
Time deposits | 2 |  | 6,227,569 |  |  | 6,201,519 |  |  | 2,710,231 |  |  | 2,667,535 |
Securities sold under agreements to repurchase | 2 |  | 252,119 |  |  | 252,119 |  |  | 308,769 |  |  | 308,769 |
Borrowings | 2 |  | 3,950,000 |  |  | 3,950,037 |  |  | 906,175 |  |  | 905,591 |
Junior subordinated debentures, at fair value | 3 |  | 316,440 |  |  | 316,440 |  |  | 323,639 |  |  | 323,639 |
Junior and other subordinated debentures, at amortized cost | 3 |  | 107,895 |  |  | 97,695 |  |  | 87,813 |  |  | 80,922 |
Derivatives | 2,3 |  | 261,091 |  |  | 261,091 |  |  | 271,205 |  |  | 271,205 |
Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis | The following tables present information about the Company's assets and liabilities measured at fair value on a recurring basis as of December 31, 2023 and 2022:
(in thousands) | December 31, 2023
Description | Total |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |
Equity and other investment securities |  |  |  |  |  |  |
Investments in mutual funds and other securities | $ | 63,298 |  |  | $ | 44,839 |  |  | $ | 18,459 |  |  | $ | — |
Equity securities held in rabbi trusts | 13,697 |  |  | 13,697 |  |  | — |  |  | — |
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury and agencies | 1,478,392 |  |  | 373,664 |  |  | 1,104,728 |  |  | — |
Obligations of states and political subdivisions | 1,072,105 |  |  | — |  |  | 1,072,105 |  |  | — |
Mortgage-backed securities and collateralized mortgage obligations | 6,279,373 |  |  | — |  |  | 6,279,373 |  |  | — |
Loans held for sale, at fair value | 30,715 |  |  | — |  |  | 30,715 |  |  | — |
Loans and leases, at fair value | 275,140 |  |  | — |  |  | 275,140 |  |  | — |
Residential mortgage servicing rights, at fair value | 109,243 |  |  | — |  |  | — |  |  | 109,243 |
Derivatives |  |  |  |  |  |  |
Interest rate futures | 3,745 |  |  | — |  |  | 3,745 |  |  | — |
Interest rate forward sales commitments | 9 |  |  | — |  |  | 9 |  |  | — |
Interest rate swaps | 33,874 |  |  | — |  |  | 33,874 |  |  | — |
Foreign currency derivatives | 457 |  |  | — |  |  | 457 |  |  | — |
Total assets measured at fair value | $ | 9,360,048 |  |  | $ | 432,200 |  |  | $ | 8,818,605 |  |  | $ | 109,243 |
Financial liabilities: |  |  |  |  |  |  |
Junior subordinated debentures, at fair value | $ | 316,440 |  |  | $ | — |  |  | $ | — |  |  | $ | 316,440 |
Derivatives |  |  |  |  |  |  |
Interest rate lock commitments | 137 |  |  | — |  |  | — |  |  | 137 |
Interest rate forward sales commitments | 535 |  |  | — |  |  | 535 |  |  | — |
Interest rate swaps | 260,064 |  |  | — |  |  | 260,064 |  |  | — |
Foreign currency derivatives | 355 |  |  | — |  |  | 355 |  |  | — |
Total liabilities measured at fair value | $ | 577,531 |  |  | $ | — |  |  | $ | 260,954 |  |  | $ | 316,577 |
(in thousands) | December 31, 2022
Description | Total |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |
Equity and other investment securities |  |  |  |  |  |  |
Investments in mutual funds and other securities | $ | 61,593 |  |  | $ | 44,256 |  |  | $ | 17,337 |  |  | $ | — |
Equity securities held in rabbi trusts | 11,366 |  |  | 11,366 |  |  | — |  |  | — |
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury and agencies | 936,174 |  |  | 225,853 |  |  | 710,321 |  |  | — |
Obligations of states and political subdivisions | 269,800 |  |  | — |  |  | 269,800 |  |  | — |
Mortgage-backed securities and collateralized mortgage obligations | 1,990,192 |  |  | — |  |  | 1,990,192 |  |  | — |
Loans held for sale, at fair value | 71,647 |  |  | — |  |  | 71,647 |  |  | — |
Loans and leases, at fair value | 285,581 |  |  | — |  |  | 285,581 |  |  | — |
Residential mortgage servicing rights, at fair value | 185,017 |  |  | — |  |  | — |  |  | 185,017 |
Derivatives |  |  |  |  |  |  |
Interest rate lock commitments | 50 |  |  | — |  |  | — |  |  | 50 |
Interest rate forward sales commitments | 512 |  |  | — |  |  | 512 |  |  | — |
Interest rate swaps | 14,657 |  |  | — |  |  | 14,657 |  |  | — |
Foreign currency derivatives | 225 |  |  | — |  |  | 225 |  |  | — |
Total assets measured at fair value | $ | 3,826,814 |  |  | $ | 281,475 |  |  | $ | 3,360,272 |  |  | $ | 185,067 |
Financial liabilities: |  |  |  |  |  |  |
Junior subordinated debentures, at fair value | $ | 323,639 |  |  | $ | — |  |  | $ | — |  |  | $ | 323,639 |
Derivatives |  |  |  |  |  |  |
Interest rate lock commitments | 18 |  |  | — |  |  | — |  |  | 18 |
Interest rate futures | 392 |  |  | — |  |  | 392 |  |  | — |
Interest rate forward sales commitments | 601 |  |  | — |  |  | 601 |  |  | — |
Interest rate swaps | 270,009 |  |  | — |  |  | 270,009 |  |  | — |
Foreign currency derivatives | 185 |  |  | — |  |  | 185 |  |  | — |
Total liabilities measured at fair value | $ | 594,844 |  |  | $ | — |  |  | $ | 271,187 |  |  | $ | 323,657 |
Schedule of a Description of the Valuation Technique, Unobservable Input, and Qualitative Information for the Company's Assets and Liabilities Classified as Level 3 | The following table provides a description of the valuation technique, significant unobservable inputs, and qualitative information about the unobservable inputs for the Company's assets and liabilities classified as Level 3 and measured at fair value on a recurring basis as of December 31, 2023: |
Schedule Of Reconciliation Of Assets And Liabilities Measured At Fair Value Using Significant Unobservable Inputs (Level 3) On A Recurring Basis | The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the years ended December 31, 2023 and 2022.
| 2023 |  | 2022
(in thousands) | Residential mortgage servicing rights |  | Interest rate lock commitments, net |  | Junior subordinated debentures, at fair value |  | Residential mortgage servicing rights |  | Interest rate lock commitments, net |  | Junior subordinated debentures, at fair value
Beginning balance | $ | 185,017 |  |  | $ | 32 |  |  | $ | (323,639) |  |  | $ | 123,615 |  |  | $ | 4,641 |  |  | $ | (293,081) |
Change included in earnings | (23,816) |  |  | (234) |  |  | (29,045) |  |  | 37,265 |  |  | (7,342) |  |  | (15,715) |
Change in fair values included in comprehensive income/loss | — |  |  | — |  |  | 7,866 |  |  | — |  |  | — |  |  | (28,842) |
Purchases and issuances | 5,347 |  |  | (1,029) |  |  | — |  |  | 24,137 |  |  | 10,103 |  |  | — |
Sales and settlements | (57,305) |  |  | 1,094 |  |  | 28,378 |  |  | — |  |  | (7,370) |  |  | 13,999 |
Ending balance | $ | 109,243 |  |  | $ | (137) |  |  | $ | (316,440) |  |  | $ | 185,017 |  |  | $ | 32 |  |  | $ | (323,639) |
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period | $ | (6,122) |  |  | $ | (137) |  |  | $ | (29,045) |  |  | $ | 57,537 |  |  | $ | 32 |  |  | $ | (15,715) |
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period | $ | — |  |  | $ | — |  |  | $ | 7,866 |  |  | $ | — |  |  | $ | — |  |  | $ | (28,842) |
Changes in residential mortgage servicing rights carried at fair value are recorded in residential mortgage banking revenue within non-interest income. Gains (losses) on interest rate lock commitments carried at fair value are recorded in residential mortgage banking revenue within non-interest income. The contractual interest expense on the junior subordinated debentures is recorded on an accrual basis as interest on junior subordinated debentures within interest expense. Settlements related to the junior subordinated debentures represent the payment of accrued interest that is embedded in the fair value of these liabilities. |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis |
| 2023
(in thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3
Loans and leases | $ | 5,036 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,036 |
Total assets measured at fair value on a nonrecurring basis | $ | 5,036 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,036 |
| 2022
(in thousands) | Total |  | Level 1 |  | Level 2 |  | Level 3
Loans and leases | $ | 3,216 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,216 |
Total assets measured at fair value on a nonrecurring basis | $ | 3,216 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,216 |
Losses Resulting From Nonrecurring Fair Value Adjustments |  | The following table presents the losses resulting from nonrecurring fair value adjustments for the years ended December 31, 2023, 2022, and 2021:
(in thousands) | 2023 |  | 2022 |  | 2021
Loans and leases | $ | 104,320 |  |  | $ | 39,422 |  |  | $ | 53,182 |
Total losses from nonrecurring measurements | $ | 104,320 |  |  | $ | 39,422 |  |  | $ | 53,182 |
Fair Value Option | The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale and loans held for investment accounted for under the fair value option as of December 31, 2023 and 2022:
| December 31, 2023 |  | December 31, 2022
(in thousands) | Fair Value |  | Aggregate Unpaid Principal Balance |  | Fair Value Less Aggregate Unpaid Principal Balance |  | Fair Value |  | Aggregate Unpaid Principal Balance |  | Fair Value Less Aggregate Unpaid Principal Balance
Loans held for sale | $ | 30,715 |  |  | $ | 29,629 |  |  | $ | 1,086 |  |  | $ | 71,647 |  |  | $ | 70,219 |  |  | $ | 1,428 |
Loans | $ | 275,140 |  |  | $ | 320,397 |  |  | $ | (45,257) |  |  | $ | 285,581 |  |  | $ | 333,469 |  |  | $ | (47,888) |

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