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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investments Available-for-Sale by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Total investment securities available-for-sale | $ 1,408,935 | $ 1,668,316
Estimated Fair Value |  |
Less: allowance for credit losses | (22) | (17)
Total investment securities available-for-sale | 1,267,404 |
Amortized Cost |  |
Less: allowance for credit losses | (1,306) | (1,956)
Total investment securities held-to-maturity | 938,647 | 1,015,737
Estimated Fair Value |  |
Total investment securities held-to-maturity | 820,382 | 901,582
Asset-Backed Securities |  |
Amortized Cost |  |
Within one year | 188,499 |
One to five years | 359,242 |
Five to ten years | 68,580 |
Beyond ten years | 19,551 |
Estimated Fair Value |  |
Within one year | 184,939 |
One to five years | 331,649 |
Five to ten years | 59,826 |
Beyond ten years | 16,751 |
Amortized Cost |  |
Within one year | 6,946 |
One to five years | 64,060 |
Five to ten years | 105,977 |
Beyond ten years | 68,491 |
Less: allowance for credit losses | (1,306) |
Total investment securities held-to-maturity | 938,647 |
Total | 2,347,582 |
Estimated Fair Value |  |
Within one year | 6,900 |
One to five years | 61,728 |
Five to ten years | 96,087 |
Beyond ten years | 60,198 |
Total investment securities held-to-maturity | 820,382 |
Total | 2,087,786 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 719,815 |
Total investment securities available-for-sale | 719,815 | 823,992
Estimated Fair Value |  |
Estimated fair value, without maturity date | 625,316 |
Less: allowance for credit losses | 0 | 0
Amortized Cost |  |
Amortized cost, without maturity date | 605,904 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 519,963 |
Total investment securities held-to-maturity | 519,963 | 590,063
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 53,248 |
Total investment securities available-for-sale | 53,248 | 54,557
Estimated Fair Value |  |
Estimated fair value, without maturity date | 48,945 |
Less: allowance for credit losses | 0 | 0
Amortized Cost |  |
Amortized cost, without maturity date | 88,575 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 75,506 |
Total investment securities held-to-maturity | $ 75,506 | $ 77,360

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