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Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities | The following tables present the amortized cost, gross unrealized gains and losses, and estimated fair values of debt securities as of the dates presented:
| June 30, 2025
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale: |  |  |  |  |  |  |
U.S. Treasury and agencies | $ | 1,391,854 |  |  | $ | 5,528 |  |  | $ | (50,322) |  |  | $ | 1,347,060 |
Obligations of states and political subdivisions | 1,041,810 |  |  | 3,275 |  |  | (30,202) |  |  | 1,014,883 |
Mortgage-backed securities and collateralized mortgage obligations | 6,637,696 |  |  | 32,849 |  |  | (379,316) |  |  | 6,291,229 |
Total available for sale securities | $ | 9,071,360 |  |  | $ | 41,652 |  |  | $ | (459,840) |  |  | $ | 8,653,172 |
Held to maturity: |  |  |  |  |  |  |
Mortgage-backed securities and collateralized mortgage obligations | $ | 2,013 |  |  | $ | 572 |  |  | $ | — |  |  | $ | 2,585 |
Total held to maturity securities | $ | 2,013 |  |  | $ | 572 |  |  | $ | — |  |  | $ | 2,585 |
| December 31, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale: |  |  |  |  |  |  |
U.S. Treasury and agencies | $ | 1,495,542 |  |  | $ | 1,092 |  |  | $ | (73,847) |  |  | $ | 1,422,787 |
Obligations of states and political subdivisions | 1,055,535 |  |  | 2,779 |  |  | (32,261) |  |  | 1,026,053 |
Mortgage-backed securities and collateralized mortgage obligations | 6,307,252 |  |  | 3,937 |  |  | (485,414) |  |  | 5,825,775 |
Total available for sale securities | $ | 8,858,329 |  |  | $ | 7,808 |  |  | $ | (591,522) |  |  | $ | 8,274,615 |
Held to maturity: |  |  |  |  |  |  |
Mortgage-backed securities and collateralized mortgage obligations | $ | 2,101 |  |  | $ | 602 |  |  | $ | — |  |  | $ | 2,703 |
Total held to maturity securities | $ | 2,101 |  |  | $ | 602 |  |  | $ | — |  |  | $ | 2,703 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | The following tables present debt securities that were in an unrealized loss position as of the dates presented, based on the length of time individual securities have been in an unrealized loss position:
| June 30, 2025
| Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | $ | 100,399 |  |  | $ | (305) |  |  | $ | 768,214 |  |  | $ | (50,017) |  |  | $ | 868,613 |  |  | $ | (50,322) |
Obligations of states and political subdivisions | 484,667 |  |  | (8,995) |  |  | 273,928 |  |  | (21,207) |  |  | 758,595 |  |  | (30,202) |
Mortgage-backed securities and collateralized mortgage obligations | 1,998,734 |  |  | (26,985) |  |  | 1,793,745 |  |  | (352,331) |  |  | 3,792,479 |  |  | (379,316) |
Total temporarily impaired securities | $ | 2,583,800 |  |  | $ | (36,285) |  |  | $ | 2,835,887 |  |  | $ | (423,555) |  |  | $ | 5,419,687 |  |  | $ | (459,840) |
| December 31, 2024
| Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | $ | 185,042 |  |  | $ | (2,770) |  |  | $ | 794,521 |  |  | $ | (71,077) |  |  | $ | 979,563 |  |  | $ | (73,847) |
Obligations of states and political subdivisions | 539,440 |  |  | (8,036) |  |  | 224,973 |  |  | (24,225) |  |  | 764,413 |  |  | (32,261) |
Mortgage-backed securities and collateralized mortgage obligations | 3,398,609 |  |  | (78,817) |  |  | 1,830,720 |  |  | (406,597) |  |  | 5,229,329 |  |  | (485,414) |
Total temporarily impaired securities | $ | 4,123,091 |  |  | $ | (89,623) |  |  | $ | 2,850,214 |  |  | $ | (501,899) |  |  | $ | 6,973,305 |  |  | $ | (591,522) |
Schedule Of Maturities Of Investment Securities | The following table presents the contractual maturities of debt securities as of June 30, 2025. Expected maturities will differ from contractual maturities because some securities may be called or prepaid with or without call or prepayment penalties.
| Available For Sale |  | Held To Maturity
(in thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 274,177 |  |  | $ | 274,135 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 2,765,054 |  |  | 2,745,942 |  |  | 2 |  |  | 2 |
Due after five years through ten years | 1,458,634 |  |  | 1,417,224 |  |  | 1 |  |  | 541 |
Due after ten years | 4,573,495 |  |  | 4,215,871 |  |  | 2,010 |  |  | 2,042 |
Total debt securities | $ | 9,071,360 |  |  | $ | 8,653,172 |  |  | $ | 2,013 |  |  | $ | 2,585 |

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