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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment in AFS and HTM Securities | The table below summarizes the Company's investment in AFS securities by major security type.
|  | As of March 31, 2026
(dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Estimated Fair Value
U.S. agency securities |  | $ | 332,381 |  |  | $ | — |  |  | $ | (17,318) |  |  |  |  | $ | 315,063 |
Residential mortgage-backed securities |  | 597,422 |  |  | 65 |  |  | (58,177) |  |  |  |  | 539,310 |
Commercial mortgage-backed securities |  | 68,581 |  |  | — |  |  | (2,465) |  |  |  |  | 66,116 |
Municipal bonds |  | 8,380 |  |  | — |  |  | (508) |  |  |  |  | 7,872 |
Corporate bonds |  | 2,000 |  |  | — |  |  | (47) |  |  |  |  | 1,953 |
Total available-for-sale securities |  | $ | 1,008,764 |  |  | $ | 65 |  |  | $ | (78,515) |  |  |  |  | $ | 930,314 |
|  | As of December 31, 2025
(dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Estimated Fair Value
U.S. agency securities |  | $ | 355,249 |  |  | $ | — |  |  | $ | (17,541) |  |  |  |  | $ | 337,708 |
Residential mortgage-backed securities |  | 620,540 |  |  | 152 |  |  | (58,188) |  |  |  |  | 562,504
Commercial mortgage-backed securities |  | 68,931 |  |  | 117 |  |  | (2,503) |  |  |  |  | 66,545
Municipal bonds |  | 8,426 |  |  | — |  |  | (380) |  |  |  |  | 8,046
Corporate bonds |  | 2,000 |  |  | — |  |  | (33) |  |  |  |  | 1,967
Total available-for-sale securities |  | $ | 1,055,146 |  |  | $ | 269 |  |  | $ | (78,645) |  |  |  |  | $ | 976,770 |
The table below summarizes the Company's investment in HTM securities by major security type.
|  | As of March 31, 2026
(dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Residential mortgage-backed securities |  | $ | 531,370 |  |  | $ | — |  |  | $ | (62,117) |  |  | $ | 469,253 |
Commercial mortgage-backed securities |  | 85,189 |  |  | — |  |  | (10,006) |  |  | 75,183 |
Municipal bonds |  | 106,813 |  |  | — |  |  | (8,221) |  |  | 98,592 |
Corporate bonds |  | 118,808 |  |  | 120 |  |  | (4,718) |  |  | 114,210 |
Total |  | 842,180 |  |  | $ | 120 |  |  | $ | (85,062) |  |  | $ | 757,238 |
Less: Allowance for credit losses |  | (907) |  |  |  |  |  |  |
Total held-to-maturity securities, net of ACL |  | $ | 841,273 |  |  |  |  |  |  |
|  | As of December 31, 2025
(dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Residential mortgage-backed securities |  | $ | 544,402 |  |  | $ | — |  |  | $ | (58,836) |  |  | $ | 485,566 |
Commercial mortgage-backed securities |  | 85,760 |  |  | — |  |  | (9,787) |  |  | 75,973 |
Municipal bonds |  | 106,875 |  |  | — |  |  | (6,933) |  |  | 99,942 |
Corporate bonds |  | 118,773 |  |  | 8 |  |  | (5,315) |  |  | 113,466 |
Total |  | 855,810 |  |  | $ | 8 |  |  | $ | (80,871) |  |  | $ | 774,947 |
Less: Allowance for credit losses |  | (1,030) |  |  |  |  |  |  |
Total held-to-maturity securities, net of ACL |  | $ | 854,780 |  |  |  |  |  |  |
Schedule of Continuous Unrealized Loss on AFS and HTM Securities | The table below summarizes, by length of time, the Company's AFS securities that have been in a continuous unrealized loss position and HTM securities that have been in a continuous unrecognized loss position.
|  | As of March 31, 2026
|  |  |  | Less than 12 Months |  | 12 Months or Greater |  | Total
(dollars in thousands) |  | Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 315,063 |  |  | $ | (17,318) |  |  | $ | 315,063 |  |  | $ | (17,318) |
Residential mortgage-backed securities |  | 141 |  |  | 17,423 |  |  | (92) |  |  | 512,563 |  |  | (58,085) |  |  | 529,986 |  |  | (58,177) |
Commercial mortgage-backed securities |  | 12 |  |  | 29,017 |  |  | (31) |  |  | 37,099 |  |  | (2,434) |  |  | 66,116 |  |  | (2,465) |
Municipal bonds |  | 1 |  |  | — |  |  | — |  |  | 7,872 |  |  | (508) |  |  | 7,872 |  |  | (508) |
Corporate bonds |  | 1 |  |  | — |  |  | — |  |  | 1,953 |  |  | (47) |  |  | 1,953 |  |  | (47) |
Total |  | 205 |  |  | $ | 46,440 |  |  | $ | (123) |  |  | $ | 874,550 |  |  | $ | (78,392) |  |  | $ | 920,990 |  |  | $ | (78,515) |
Investment securities held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities |  | 135 |  |  | $ | — |  |  | $ | — |  |  | $ | 469,253 |  |  | $ | (62,117) |  |  | $ | 469,253 |  |  | $ | (62,117) |
Commercial mortgage-backed securities |  | 16 |  |  | 4,230 |  |  | (531) |  |  | 70,953 |  |  | (9,475) |  |  | 75,183 |  |  | (10,006) |
Municipal bonds |  | 33 |  |  | — |  |  | — |  |  | 97,592 |  |  | (8,221) |  |  | 97,592 |  |  | (8,221) |
Corporate bonds |  | 27 |  |  | 9,841 |  |  | (29) |  |  | 97,386 |  |  | (4,689) |  |  | 107,227 |  |  | (4,718) |
Total |  | 211 |  |  | $ | 14,071 |  |  | $ | (560) |  |  | $ | 735,184 |  |  | $ | (84,502) |  |  | $ | 749,255 |  |  | $ | (85,062) |
|  | As of December 31, 2025
|  |  |  | Less than 12 Months |  | 12 Months or Greater |  | Total
(dollars in thousands) |  | Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 337,708 |  |  | $ | (17,541) |  |  | $ | 337,708 |  |  | $ | (17,541) |
Residential mortgage-backed securities |  | 139 |  |  | — |  |  | — |  |  | 546,514 |  |  | (58,188) |  |  | 546,514 |  |  | (58,188) |
Commercial mortgage-backed securities |  | 10 |  |  | — |  |  | — |  |  | 37,329 |  |  | (2,503) |  |  | 37,329 |  |  | (2,503) |
Municipal bonds |  | 1 |  |  | — |  |  | — |  |  | 8,046 |  |  | (380) |  |  | 8,046 |  |  | (380) |
Corporate bonds |  | 1 |  |  | — |  |  | — |  |  | 1,967 |  |  | (33) |  |  | 1,967 |  |  | (33) |
Total |  | 203 |  | $ | — |  |  | $ | — |  |  | $ | 931,564 |  |  | $ | (78,645) |  |  | $ | 931,564 |  |  | $ | (78,645) |
Investment securities held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed securities |  | 136 |  |  | $ | — |  |  | $ | — |  |  | $ | 485,567 |  |  | $ | (58,836) |  |  | $ | 485,567 |  |  | $ | (58,836) |
Commercial mortgage-backed securities |  | 16 |  |  | 4,271 |  |  | (503) |  |  | 71,702 |  |  | (9,284) |  |  | 75,973 |  |  | (9,787) |
Municipal bonds |  | 33 |  |  | — |  |  | — |  |  | 98,942 |  |  | (6,933) |  |  | 98,942 |  |  | (6,933) |
Corporate bonds |  | 27 |  |  | 1,922 |  |  | (18) |  |  | 106,638 |  |  | (5,297) |  |  | 108,560 |  |  | (5,315) |
Total |  | 212 |  | $ | 6,193 |  |  | $ | (521) |  |  | $ | 762,849 |  |  | $ | (80,350) |  |  | $ | 769,042 |  |  | $ | (80,871) |
Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity | The table below summarizes the Company's investment in AFS securities and HTM securities by contractual maturity. Expected maturities for mortgage-backed securities ("MBS") will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | As of March 31, 2026
(dollars in thousands) |  | Amortized Cost |  | Estimated Fair Value
Investment securities available-for-sale: |  |  |  |
Within one year |  | $ | 70,454 |  |  | $ | 69,447 |
One to five years |  | 226,437 |  |  | 213,471 |
Five to ten years |  | 27,699 |  |  | 25,939 |
Beyond ten years |  | 18,171 |  |  | 16,031 |
Residential mortgage-backed securities |  | 597,422 |  |  | 539,310 |
Commercial mortgage-backed securities |  | 68,581 |  |  | 66,116 |
Less: allowance for credit losses |  | — |  |  | — |
Total investment securities available-for-sale |  | 1,008,764 |  |  | 930,314 |
Investment securities held-to-maturity: |  |  |  |
Within one year |  | 4,928 |  |  | 4,925 |
One to five years |  | 71,030 |  |  | 69,073 |
Five to ten years |  | 98,688 |  |  | 92,668 |
Beyond ten years |  | 50,975 |  |  | 46,136 |
Residential mortgage-backed securities: |  | 531,370 |  |  | 469,253 |
Commercial mortgage-backed securities |  | 85,189 |  |  | 75,183 |
Less: allowance for credit losses |  | (907) |  |  | — |
Total investment securities held-to-maturity |  | 841,273 |  |  | 757,238 |
Total |  | $ | 1,850,037 |  |  | $ | 1,687,552 |

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