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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investment Securities |
Summary of available-for-sale securities | Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 72,717 | ​ | $ | 981 | ​ | $ | — | ​ | $ | 73,698
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 238,874 | ​ | ​ | 943 | ​ | ​ | (23,815) | ​ | ​ | 216,002
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 390,149 | ​ | ​ | 1,022 | ​ | ​ | (51,639) | ​ | ​ | 339,532
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (10) | ​ | ​ | 1,990
Other securities | ​ | ​ | 725 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 725
Total investment securities available-for-sale | ​ | $ | 704,465 | ​ | $ | 2,946 | ​ | $ | (75,464) | ​ | $ | 631,947
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 24,958 | ​ | $ | — | ​ | $ | (84) | ​ | $ | 24,874
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 164,785 | ​ | ​ | 53 | ​ | ​ | (29,793) | ​ | ​ | 135,045
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 425,476 | ​ | ​ | 432 | ​ | ​ | (60,970) | ​ | ​ | 364,938
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (38) | ​ | ​ | 1,962
Other securities | ​ | ​ | 728 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 728
Total investment securities available-for-sale | ​ | $ | 617,947 | ​ | $ | 485 | ​ | $ | (90,885) | ​ | $ | 527,547
Summary of unrealized losses for available-for-sale securities | The tables below summarize the available-for-sale securities with unrealized losses, along with the length of time they have been in an unrealized loss position, as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | $ | 28,675 | ​ | $ | (32) | ​ | $ | 129,833 | ​ | $ | (23,783) | ​ | $ | 158,508 | ​ | $ | (23,815)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 17,138 | ​ | ​ | (9) | ​ | ​ | 255,340 | ​ | ​ | (51,630) | ​ | ​ | 272,478 | ​ | ​ | (51,639)
Corporate debt | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,990 | ​ | ​ | (10) | ​ | ​ | 1,990 | ​ | ​ | (10)
Total | ​ | $ | 45,813 | ​ | $ | (41) | ​ | $ | 387,163 | ​ | $ | (75,423) | ​ | $ | 432,976 | ​ | $ | (75,464)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
U.S. Treasury securities | ​ | $ | — | ​ | $ | — | ​ | $ | 24,874 | ​ | $ | (84) | ​ | $ | 24,874 | ​ | $ | (84)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 132,935 | ​ | ​ | (29,793) | ​ | ​ | 132,935 | ​ | ​ | (29,793)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 41,426 | ​ | ​ | (95) | ​ | ​ | 264,621 | ​ | ​ | (60,875) | ​ | ​ | 306,047 | ​ | ​ | (60,970)
Corporate debt | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,963 | ​ | ​ | (38) | ​ | ​ | 1,963 | ​ | ​ | (38)
Total | ​ | $ | 41,426 | ​ | $ | (95) | ​ | $ | 424,393 | ​ | $ | (90,790) | ​ | $ | 465,819 | ​ | $ | (90,885)
Summary of available-for-sale and held-to-maturity securities by maturity | A summary of the available-for-sale securities by maturity is shown in the following table as of June 30, 2025. Mortgage-backed securities may have actual maturities that differ from contractual maturities depending on the repayment characteristics and experience of the underlying financial instruments and are therefore not included in the table below. Additionally, the Company holds other available-for-sale securities with an amortized cost and fair value of $0.7 million as of June 30, 2025 that have no stated contractual maturity date. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | $ | 72,717 | ​ | $ | 73,698 | ​ | 4.35%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | ​ | 2,000 | ​ | ​ | 1,990 | ​ | 9.96%
A summary of the held-to-maturity securities by maturity is shown in the following table as of June 30, 2025. Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments and are therefore not included in the table below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,781 | ​ | $ | 24,569 | ​ | 3.10%
Summary of held-to-maturity securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 24,781 | ​ | $ | — | ​ | $ | (212) | ​ | $ | 24,569
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 253,329 | ​ | ​ | 337 | ​ | ​ | (28,111) | ​ | ​ | 225,555
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 439,122 | ​ | ​ | 2,678 | ​ | ​ | (38,699) | ​ | ​ | 403,101
Total investment securities held-to-maturity | ​ | $ | 717,232 | ​ | $ | 3,015 | ​ | $ | (67,022) | ​ | $ | 653,225
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,639 | ​ | $ | — | ​ | $ | (480) | ​ | $ | 49,159
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 271,105 | ​ | ​ | 51 | ​ | ​ | (36,870) | ​ | ​ | 234,286
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 212,364 | ​ | ​ | — | ​ | ​ | (44,423) | ​ | ​ | 167,941
Total investment securities held-to-maturity | ​ | $ | 533,108 | ​ | $ | 51 | ​ | $ | (81,773) | ​ | $ | 451,386
Summary of unrealized losses for held-to-maturity securities | The held-to-maturity portfolio included 117 securities which were in an unrealized loss position as of June 30, 2025, compared to 160 securities at December 31, 2024. The tables below summarize the held-to-maturity securities with unrealized losses, along with the length of time they have been in an unrealized loss position, as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
U.S. Treasury securities | ​ | $ | — | ​ | $ | — | ​ | $ | 24,569 | ​ | $ | (212) | ​ | $ | 24,569 | ​ | $ | (212)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 15,162 | ​ | ​ | (175) | ​ | ​ | 178,767 | ​ | ​ | (27,936) | ​ | ​ | 193,929 | ​ | ​ | (28,111)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 149,771 | ​ | ​ | (38,699) | ​ | ​ | 149,771 | ​ | ​ | (38,699)
Total | ​ | $ | 15,162 | ​ | $ | (175) | ​ | $ | 353,107 | ​ | $ | (66,847) | ​ | $ | 368,269 | ​ | $ | (67,022)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ | ​ | value | ​ | losses | ​ | value | ​ | losses | ​ | value | ​ | losses
U.S. Treasury securities | ​ | $ | — | ​ | $ | — | ​ | $ | 49,159 | ​ | $ | (480) | ​ | $ | 49,159 | ​ | $ | (480)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 45,427 | ​ | ​ | (880) | ​ | ​ | 185,558 | ​ | ​ | (35,990) | ​ | ​ | 230,985 | ​ | ​ | (36,870)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 2,818 | ​ | ​ | (51) | ​ | ​ | 165,123 | ​ | ​ | (44,372) | ​ | ​ | 167,941 | ​ | ​ | (44,423)
Total | ​ | $ | 48,245 | ​ | $ | (931) | ​ | $ | 399,840 | ​ | $ | (80,842) | ​ | $ | 448,085 | ​ | $ | (81,773)
Summary of credit quality indicators, by amortized cost, of held-to-maturity securities | The table below summarizes the credit quality indicators, by amortized cost, of held-to-maturity securities as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025 | ​ | December 31, 2024
​ | ​ | AA+ | ​ | AA+
U.S. Treasury securities | ​ | $ | 24,781 | ​ | $ | 49,639
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 253,329 | ​ | ​ | 271,105
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 439,122 | ​ | ​ | 212,364
Total investment securities held-to-maturity | ​ | $ | 717,232 | ​ | $ | 533,108

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