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Investment Securities - Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 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 | $ 2,293,484 | [1] | $ 2,288,791 | [2] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (1,500) | [1] | (1,500) | [2] | $ (1,500) | $ (1,500)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 2,291,984 | [1] | 2,287,291 | [2] |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 676 | [1] | 1,760 | [2] |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (139,311) | [1] | (120,735) | [2] |  |
Securities held to maturity, fair value | 2,153,349 | [1] | 2,168,316 | [2] |  |
Municipal securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,248,355 |  | 1,247,310 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (140) |  | (140) |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 1,248,215 |  | 1,247,170 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 676 |  | 1,760 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (42,079) |  | (28,170) |  |  |
Securities held to maturity, fair value | 1,206,812 |  | 1,220,760 |  |  |
Agency commercial MBS |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 435,467 |  | 433,827 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 435,467 |  | 433,827 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (34,619) |  | (30,665) |  |  |
Securities held to maturity, fair value | 400,848 |  | 403,162 |  |  |
Private label commercial MBS |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 351,688 |  | 350,493 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 351,688 |  | 350,493 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (28,499) |  | (29,289) |  |  |
Securities held to maturity, fair value | 323,189 |  | 321,204 |  |  |
U.S. Treasury securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 187,759 |  | 187,033 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | 0 |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 187,759 |  | 187,033 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (15,421) |  | (11,454) |  |  |
Securities held to maturity, fair value | 172,338 |  | 175,579 |  |  |
Corporate Debt Securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 70,215 |  | 70,128 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (1,360) |  | (1,360) |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 68,855 |  | 68,768 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (18,693) |  | (21,157) |  |  |
Securities held to maturity, fair value | 50,162 |  | 47,611 |  |  |
Interest Receivable | $ 11,300 |  | $ 13,400 |  |  |
[1] | Excludes accrued interest receivable of $11.3 million at March 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] | Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets

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