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Available for Sale Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Debt Securities Available for Sale | The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for available for sale debt securities as of December 31, 2025 and 2024 (in thousands):
| 2025
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury obligations | $ | 274,500 |  |  | 190 |  |  | (7,946) |  |  | 266,744 |
Government-agency obligations | 32,693 |  |  | 877 |  |  | (31) |  |  | 33,539 |
Mortgage-backed securities | 2,705,346 |  |  | 23,454 |  |  | (116,453) |  |  | 2,612,347 |
Asset-backed securities | 41,619 |  |  | 409 |  |  | (267) |  |  | 41,761 |
State and municipal obligations | 119,173 |  |  | 1,249 |  |  | (7,423) |  |  | 112,999 |
Corporate obligations | 93,498 |  |  | 5,429 |  |  | (1,561) |  |  | 97,366 |
| $ | 3,266,829 |  |  | 31,608 |  |  | (133,681) |  |  | 3,164,756 |
| 2024
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury obligations | $ | 348,621 |  |  | 317 |  |  | (18,340) |  |  | 330,598 |
Government-agency obligations | 105,965 |  |  | 1,461 |  |  | (191) |  |  | 107,235 |
Mortgage-backed securities | 2,243,725 |  |  | 4,982 |  |  | (186,548) |  |  | 2,062,159 |
Asset-backed securities | 47,203 |  |  | 645 |  |  | (285) |  |  | 47,563 |
State and municipal obligations | 126,766 |  |  | 243 |  |  | (10,092) |  |  | 116,917 |
Corporate obligations | 103,415 |  |  | 3958 |  |  | (2,930) |  |  | 104,443 |
| $ | 2,975,695 |  |  | 11,606 |  |  | (218,386) |  |  | 2,768,915 |
Schedule of Investments Classified by Contractual Maturity Date | The amortized cost and fair value of held to maturity debt securities as of December 31, 2025 by contractual maturity, excluding allowances for credit losses of $16,000, as of December 31, 2025 are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
| 2025
| Amortized cost |  | Fair value
Due in one year or less | $ | 45,807 |  |  | 45,712 |
Due after one year through five years | 152,602 |  |  | 151,763 |
Due after five years through ten years | 78,986 |  |  | 73,941 |
Due after ten years | 4,748 |  |  | 3,802 |
| $ | 282,143 |  |  | 275,218 |
The amortized cost and fair value of available for sale debt securities as of December 31, 2025, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
| 2025
| Amortized cost |  | Fair value
Due in one year or less | $ | 108,932 |  |  | 107,858 |
Due after one year through five years | 196,488 |  |  | 190,223 |
Due after five years through ten years | 114,951 |  |  | 117,101 |
Due after ten years | 66,801 |  |  | 61,928 |
| $ | 487,172 |  |  | 477,110 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | The following table shows gross unrealized losses and estimated fair value of available for sale debt securities, aggregated by investment category and length of time that individual investment securities have been in a continuous loss position as of December 31, 2025 and 2024 (in thousands):
|  | December 31, 2025
|  | Less Than 12 months |  | 12 Months or More |  | Total
|  | Fair value |  | Unrealized Losses |  | Fair value |  | Unrealized Losses |  | Fair value |  | Unrealized Losses
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury obligations |  | $ | — |  |  | — |  |  | 245,675 |  |  | (7,946) |  |  | 245,675 |  |  | (7,946) |
Government-agency obligations |  | 8,541 |  |  | (31) |  |  | — |  |  | — |  |  | 8,541 |  |  | (31) |
Mortgage-backed securities |  | 133,316 |  |  | (4,119) |  |  | 984,261 |  |  | (112,334) |  |  | 1,117,577 |  |  | (116,453) |
Asset-backed securities |  | 20,493 |  |  | (129) |  |  | 1,605 |  |  | (138) |  |  | 22,098 |  |  | (267) |
State and municipal obligations |  | 21,613 |  |  | (665) |  |  | 53,173 |  |  | (6,758) |  |  | 74,786 |  |  | (7,423) |
Corporate obligations |  | 8,994 |  |  | (6) |  |  | 18,742 |  |  | (1,555) |  |  | 27,736 |  |  | (1,561) |
Total |  | $ | 192,957 |  |  | (4,949) |  |  | 1,303,456 |  |  | (128,732) |  |  | 1,496,412 |  |  | (133,681) |

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