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Investment Securities - Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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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 | $ 2,312,512 |  | $ 2,307,649 | [1] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (600) | [2] | (1,500) | [1] | $ (1,500) | $ (1,500)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 2,311,912 | [2] | 2,306,149 | [1] |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 61 | [2] | 35 | [1] |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (132,063) | [2] | (149,490) | [1] |  |
Securities held to maturity, fair value | 2,179,910 | [2] | 2,156,694 | [1] |  |
Interest Receivable | 13,000 |  | 12,600 |  |  |
Municipal securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,252,455 |  | 1,251,364 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (20) |  | (140) |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 1,252,435 |  | 1,251,224 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 61 |  | 35 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (59,663) |  | (54,799) |  |  |
Securities held to maturity, fair value | 1,192,833 |  | 1,196,460 |  |  |
Agency commercial MBS |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 442,172 |  | 440,476 |  |  |
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 | 442,172 |  | 440,476 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (28,137) |  | (37,840) |  |  |
Securities held to maturity, fair value | 414,035 |  | 402,636 |  |  |
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 | 356,586 |  | 355,342 |  |  |
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 | 356,586 |  | 355,342 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (19,841) |  | (26,226) |  |  |
Securities held to maturity, fair value | 336,745 |  | 329,116 |  |  |
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 | 190,726 |  | 189,985 |  |  |
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 | 190,726 |  | 189,985 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (12,291) |  | (16,702) |  |  |
Securities held to maturity, fair value | 178,435 |  | 173,283 |  |  |
Corporate Debt Securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 70,573 |  | 70,482 |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (580) |  | (1,360) |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 69,993 |  | 69,122 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (12,131) |  | (13,923) |  |  |
Securities held to maturity, fair value | 57,862 |  | 55,199 |  |  |
Held-to-maturity Securities |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Interest Receivable | $ 11,300 |  | $ 13,400 |  |  |
[1] | Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] | Excludes accrued interest receivable of $11.3 million at March 31, 2025 which is recorded in "Other assets" on the condensed consolidated balance sheets

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