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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investment Securities |
Summary of available-for-sale securities | ​ Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 74,508 | ​ | $ | — | ​ | $ | (1,464) | ​ | $ | 73,044
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 233,264 | ​ | ​ | 57 | ​ | ​ | (31,512) | ​ | ​ | 201,809
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 417,155 | ​ | ​ | — | ​ | ​ | (65,913) | ​ | ​ | 351,242
Municipal securities | ​ | ​ | 80 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 79
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (157) | ​ | ​ | 1,843
Other securities | ​ | ​ | 812 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 812
Total investment securities available-for-sale | ​ | $ | 727,819 | ​ | $ | 57 | ​ | $ | (99,047) | ​ | $ | 628,829
Summary of unrealized losses for available-for-sale securities | The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 73,044 | ​ | $ | (1,464) | ​ | $ | 73,044 | ​ | $ | (1,464)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 9 | ​ | ​ | — | ​ | ​ | 199,000 | ​ | ​ | (31,512) | ​ | ​ | 199,009 | ​ | ​ | (31,512)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 138 | ​ | ​ | (1) | ​ | ​ | 351,104 | ​ | ​ | (65,912) | ​ | ​ | 351,242 | ​ | ​ | (65,913)
Municipal securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 79 | ​ | ​ | (1) | ​ | ​ | 79 | ​ | ​ | (1)
Corporate debt | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,843 | ​ | ​ | (157) | ​ | ​ | 1,843 | ​ | ​ | (157)
Total | ​ | $ | 147 | ​ | $ | (1) | ​ | $ | 625,070 | ​ | $ | (99,046) | ​ | $ | 625,217 | ​ | $ | (99,047)
Summary of credit quality indicators, by fair value, of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | AA+ | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 24,874 | ​ | $ | — | ​ | $ | 24,874
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 135,045 | ​ | ​ | — | ​ | ​ | 135,045
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 364,938 | ​ | ​ | — | ​ | ​ | 364,938
Corporate debt | ​ | ​ | — | ​ | ​ | 1,962 | ​ | ​ | 1,962
Other securities | ​ | ​ | — | ​ | ​ | 728 | ​ | ​ | 728
Total investment securities available-for-sale | ​ | $ | 524,857 | ​ | $ | 2,690 | ​ | $ | 527,547
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | AAA | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 73,044 | ​ | $ | — | ​ | $ | 73,044
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 201,809 | ​ | ​ | — | ​ | ​ | 201,809
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 351,242 | ​ | ​ | — | ​ | ​ | 351,242
Municipal securities | ​ | ​ | — | ​ | ​ | 79 | ​ | ​ | 79
Corporate debt | ​ | ​ | — | ​ | ​ | 1,843 | ​ | ​ | 1,843
Other securities | ​ | ​ | — | ​ | ​ | 812 | ​ | ​ | 812
Total investment securities available-for-sale | ​ | $ | 626,095 | ​ | $ | 2,734 | ​ | $ | 628,829
Summary of available-for-sale and held-to-maturity securities by maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,958 | ​ | $ | 24,874 | ​ | 2.55%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After five but within ten years | ​ | ​ | 2,000 | ​ | ​ | 1,962 | ​ | 5.86%
​
0 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,974 | ​ | $ | 24,884 | ​ | 3.18%
After one but within five years | ​ | ​ | 24,665 | ​ | ​ | 24,275 | ​ | 3.10%
Total | ​ | $ | 49,639 | ​ | $ | 49,159 | ​ | 3.14%
Summary of held-to-maturity securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,338 | ​ | $ | — | ​ | $ | (1,004) | ​ | $ | 48,334
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 299,337 | ​ | ​ | 226 | ​ | ​ | (34,552) | ​ | ​ | 265,011
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 236,377 | ​ | ​ | 2 | ​ | ​ | (45,396) | ​ | ​ | 190,983
Total investment securities held-to-maturity | ​ | $ | 585,052 | ​ | $ | 228 | ​ | $ | (80,952) | ​ | $ | 504,328
Summary of unrealized losses for held-to-maturity securities | The held-to-maturity portfolio included 160 securities which were in an unrealized loss position at December 31, 2024, compared to 123 securities at December 31, 2023. The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 48,334 | ​ | $ | (1,004) | ​ | $ | 48,334 | ​ | $ | (1,004)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 14,689 | ​ | ​ | (72) | ​ | ​ | 217,467 | ​ | ​ | (34,480) | ​ | ​ | 232,156 | ​ | ​ | (34,552)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 2,289 | ​ | ​ | (37) | ​ | ​ | 187,021 | ​ | ​ | (45,359) | ​ | ​ | 189,310 | ​ | ​ | (45,396)
Total | ​ | $ | 16,978 | ​ | $ | (109) | ​ | $ | 452,822 | ​ | $ | (80,843) | ​ | $ | 469,800 | ​ | $ | (80,952)
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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | December 31, 2023
​ | ​ | AA+ | ​ | AAA
U.S. Treasury securities | ​ | $ | 49,639 | ​ | $ | 49,338
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 271,105 | ​ | ​ | 299,337
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 212,364 | ​ | ​ | 236,377
Total investment securities held-to-maturity | ​ | $ | 533,108 | ​ | $ | 585,052

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