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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 USD ($) security shares | Sep. 30, 2024 USD ($) security shares | Dec. 31, 2023 USD ($) security shares | Dec. 31, 2016 shares
Securities in the available-for-sale portfolio in a continuous loss position |  |  |  |
Number of individual securities in a continuous loss position | security | 222 | 187 | 222 |
Time in Continuous Loss, Unrealized Losses |  |  |  |
Less Than 12 Months Unrealized Losses | $ (564) | $ (2) | $ (564) |
12 Months or More Unrealized Losses | (302,818) | (235,285) | (302,818) |
Total Unrealized Losses | (303,382) | (235,287) | (303,382) |
Time in Continuous Loss, Fair Value |  |  |  |
Less Than 12 Months, Fair Value | 63,667 | 2,998 | 63,667 |
12 Months or More Fair Value | 2,170,608 | 1,824,946 | 2,170,608 |
Total Fair Value | 2,234,275 | 1,827,944 | 2,234,275 |
Allowance for credit losses, investment securities | 0 | $ 0 | $ 0 |
Investment securities comprised of collateralized loan obligations rated AA or better and obligations issued by local state and political subdivisions rated AA or better |  | 5.00% |  |
Class B restricted shares |  |  |  |
Time in Continuous Loss, Fair Value |  |  |  |
Net realized gain | $ 40,800 |  |  |
Shares held | shares | 0 | 0 | 0 |
Number of shares sold | shares |  |  | 120,000 |
Class B restricted shares | Visa |  |  |  |
Time in Continuous Loss, Fair Value |  |  |  |
Number of shares sold | shares |  |  |  | 274,000
U.S. Treasury and government agency debt securities |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | $ (666) | $ (123) | $ (666) |
Total Unrealized Losses | (666) | (123) | (666) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 32,503 | 13,197 | 32,503 |
Total Fair Value | 32,503 | 13,197 | 32,503 |
Government-sponsored enterprises debt securities |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (408) | (153) | (408) |
Total Unrealized Losses | (408) | (153) | (408) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 19,592 | 19,847 | 19,592 |
Total Fair Value | 19,592 | 19,847 | 19,592 |
Residential - Government-sponsored enterprises |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (112,124) | (84,040) | (112,124) |
Total Unrealized Losses | (112,124) | (84,040) | (112,124) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 783,297 | 723,591 | 783,297 |
Total Fair Value | 783,297 | 723,591 | 783,297 |
Residential - Government agency |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (1,121) | (989) | (1,121) |
Total Unrealized Losses | (1,121) | (989) | (1,121) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 10,182 | 9,367 | 10,182 |
Total Fair Value | 10,182 | 9,367 | 10,182 |
Commercial - Government agency |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (50,270) | (44,835) | (50,270) |
Total Unrealized Losses | (50,270) | (44,835) | (50,270) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 218,674 | 216,010 | 218,674 |
Total Fair Value | 218,674 | 216,010 | 218,674 |
Commercial - Government-sponsored enterprises |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (7,028) | (4,547) | (7,028) |
Total Unrealized Losses | (7,028) | (4,547) | (7,028) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 86,431 | 69,067 | 86,431 |
Total Fair Value | 86,431 | 69,067 | 86,431 |
Commercial - Non-agency |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (281) |  | (281) |
Total Unrealized Losses | (281) |  | (281) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 21,683 |  | 21,683 |
Total Fair Value | 21,683 |  | 21,683 |
Government agency |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (67,568) | (53,748) | (67,568) |
Total Unrealized Losses | (67,568) | (53,748) | (67,568) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 471,150 | 434,141 | 471,150 |
Total Fair Value | 471,150 | 434,141 | 471,150 |
Government-sponsored enterprises |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
12 Months or More Unrealized Losses | (61,856) | (46,850) | (61,856) |
Total Unrealized Losses | (61,856) | (46,850) | (61,856) |
Time in Continuous Loss, Fair Value |  |  |  |
12 Months or More Fair Value | 363,970 | 339,726 | 363,970 |
Total Fair Value | 363,970 | 339,726 | 363,970 |
Collateralized loan obligations |  |  |  |
Time in Continuous Loss, Unrealized Losses |  |  |  |
Less Than 12 Months Unrealized Losses | (564) | (2) | (564) |
12 Months or More Unrealized Losses | (1,496) |  | (1,496) |
Total Unrealized Losses | (2,060) | (2) | (2,060) |
Time in Continuous Loss, Fair Value |  |  |  |
Less Than 12 Months, Fair Value | 63,667 | 2,998 | 63,667 |
12 Months or More Fair Value | 163,126 |  | 163,126 |
Total Fair Value | $ 226,793 | $ 2,998 | $ 226,793 |

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