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Investment Securities - Schedule of Amortized Cost and Estimated FV of Investments AFS by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Total investment securities available-for-sale | $ 1,550,038 | $ 1,668,316
Estimated Fair Value |  |
Less: allowance for credit losses | (17) | (17)
Total investment securities available-for-sale | 1,433,006 |
Amortized Cost |  |
Allowance for credit losses | (1,237) | (1,956)
Total held-to-maturity securities, net of ACL | 961,925 | 1,015,737
Estimated Fair Value |  |
Total investment securities held-to-maturity | 868,425 | 901,582
Asset-Backed Securities |  |
Amortized Cost |  |
Within one year | 226,404 |
One to five years | 419,569 |
Five to ten years | 85,553 |
Beyond ten years | 19,795 |
Estimated Fair Value |  |
Within one year | 223,552 |
One to five years | 394,901 |
Five to ten years | 76,816 |
Beyond ten years | 17,493 |
Amortized Cost |  |
Within one year | 7,699 |
One to five years | 57,804 |
Five to ten years | 118,626 |
Beyond ten years | 68,561 |
Allowance for credit losses | (1,237) |
Total held-to-maturity securities, net of ACL | 961,925 |
Total | 2,511,963 |
Estimated Fair Value |  |
Within one year | 7,636 |
One to five years | 56,704 |
Five to ten years | 107,212 |
Beyond ten years | 62,673 |
Total investment securities held-to-maturity | 868,425 |
Total | 2,301,431 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 745,006 |
Total investment securities available-for-sale | 745,006 | 823,992
Estimated Fair Value |  |
Estimated fair value, without maturity date | 670,045 |
Less: allowance for credit losses | 0 | 0
Amortized Cost |  |
Amortized cost, without maturity date | 621,203 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 554,939 |
Total investment securities held-to-maturity | 554,939 | 590,063
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 53,711 |
Total investment securities available-for-sale | 53,711 | 54,557
Estimated Fair Value |  |
Estimated fair value, without maturity date | 50,216 |
Less: allowance for credit losses | 0 | 0
Amortized Cost |  |
Amortized cost, without maturity date | 89,269 |
Estimated Fair Value |  |
Estimated fair value, without maturity date | 79,261 |
Total investment securities held-to-maturity | $ 79,261 | $ 77,360

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