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Investment Securities - Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 2,307,649 |  | $ 2,288,791 |
Interest Receivable | 12,600 |  | 10,000 |
(fair value of $2,156,694 and $2,168,316, respectively) | 2,306,149 | [1] | 2,287,291 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 35 | [1] | 1,760 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (149,490) | [1] | (120,735) |
Debt Securities, Held-to-maturity, Fair Value | 2,156,694 | [1] | 2,168,316 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (1,500) | [1] | (1,500) | $ (1,500)
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,251,364 |  | 1,247,310 |
(fair value of $2,156,694 and $2,168,316, respectively) | 1,251,224 |  | 1,247,170 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 35 |  | 1,760 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (54,799) |  | (28,170) |
Debt Securities, Held-to-maturity, Fair Value | 1,196,460 |  | 1,220,760 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (140) |  | (140) |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 440,476 |  | 433,827 |
(fair value of $2,156,694 and $2,168,316, respectively) | 440,476 |  | 433,827 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (37,840) |  | (30,665) |
Debt Securities, Held-to-maturity, Fair Value | 402,636 |  | 403,162 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |
Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 355,342 |  | 350,493 |
(fair value of $2,156,694 and $2,168,316, respectively) | 355,342 |  | 350,493 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (26,226) |  | (29,289) |
Debt Securities, Held-to-maturity, Fair Value | 329,116 |  | 321,204 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |
US Treasury Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 189,985 |  | 187,033 |
(fair value of $2,156,694 and $2,168,316, respectively) | 189,985 |  | 187,033 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (16,702) |  | (11,454) |
Debt Securities, Held-to-maturity, Fair Value | 173,283 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |
Corporate Debt Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 70,482 |  | 70,128 |
Interest Receivable | 13,400 |  | 13,400 |
(fair value of $2,156,694 and $2,168,316, respectively) | 69,122 |  | 68,768 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (13,923) |  | (21,157) |
Debt Securities, Held-to-maturity, Fair Value | 55,199 |  | 47,611 |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | $ (1,360) |  | $ (1,360) |
[1] | Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the consolidated balance shee

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