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Investment Securities - Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized Cost |  |
Total investment securities available-for-sale | $ 1,008,764 |
Estimated Fair Value |  |
Less: allowance for credit losses | 0 | $ 0
Total investment securities available-for-sale | 930,314 |
Held to maturity, allowance for credit loss | 907 | 1,030
Amortized Cost |  |
Less: allowance for credit losses | (907) | (1,030)
Total investment securities held-to-maturity | 841,273 | 854,780
Estimated Fair Value |  |
Total investment securities held-to-maturity | 757,238 | 774,947
Asset-Backed Securities |  |
Amortized Cost |  |
Within one year | 70,454 |
One to five years | 226,437 |
Five to ten years | 27,699 |
Beyond ten years | 18,171 |
Estimated Fair Value |  |
Within one year | 69,447 |
One to five years | 213,471 |
Five to ten years | 25,939 |
Beyond ten years | 16,031 |
Held to maturity, allowance for credit loss | 907 |
Amortized Cost |  |
Within one year | 4,928 |
One to five years | 71,030 |
Five to ten years | 98,688 |
Beyond ten years | 50,975 |
Less: allowance for credit losses | (907) |
Total investment securities held-to-maturity | 841,273 |
Total | 1,850,037 |
Estimated Fair Value |  |
Within one year | 4,925 |
One to five years | 69,073 |
Five to ten years | 92,668 |
Beyond ten years | 46,136 |
Total investment securities held-to-maturity | 757,238 |
Total | 1,687,552 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity | 597,422 |
Estimated Fair Value |  |
Estimated fair value, without maturity | 539,310 |
Amortized Cost |  |
Amortized cost, without maturity | 531,370 |
Estimated Fair Value |  |
Estimated fair value, without maturity | 469,253 |
Total investment securities held-to-maturity | 469,253 | 485,566
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity | 68,581 |
Estimated Fair Value |  |
Estimated fair value, without maturity | 66,116 |
Amortized Cost |  |
Amortized cost, without maturity | 85,189 |
Estimated Fair Value |  |
Estimated fair value, without maturity | 75,183 |
Total investment securities held-to-maturity | $ 75,183 | $ 75,973

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