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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment Securities |
Available-for-sale Securities | ​ Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | Amortized |  | Gross |  | Gross |  | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 74,031 | ​ | $ | — | ​ | $ | (2,643) | ​ | $ | 71,388
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 263,939 | ​ | ​ | 1 | ​ | ​ | (37,809) | ​ | ​ | 226,131
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 478,866 | ​ |  | — | ​ |  | (72,940) | ​ |  | 405,926
Municipal securities | ​ | ​ | 155 | ​ | ​ | — | ​ | ​ | (2) | ​ | ​ | 153
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (80) | ​ | ​ | 1,920
Other securities | ​ |  | 771 | ​ |  | — | ​ |  | — | ​ |  | 771
Total investment securities available-for-sale | ​ | $ | 819,762 | ​ | $ | 1 | ​ | $ | (113,474) | ​ | $ | 706,289
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, 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)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | 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 | ​ | $ | 71,388 | ​ | $ | (2,643) | ​ | $ | — | ​ | $ | — | ​ | $ | 71,388 | ​ | $ | (2,643)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 83,748 | ​ | ​ | (6,686) | ​ | ​ | 141,272 | ​ | ​ | (31,123) | ​ | ​ | 225,020 | ​ | ​ | (37,809)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 196,449 | ​ | ​ | (22,809) | ​ | ​ | 209,477 | ​ | ​ | (50,131) | ​ | ​ | 405,926 | ​ | ​ | (72,940)
Municipal securities | ​ | ​ | 153 | ​ | ​ | (2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 153 | ​ | ​ | (2)
Corporate debt | ​ | ​ | 1,920 | ​ | ​ | (80) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,920 | ​ | ​ | (80)
Total | ​ | $ | 353,658 | ​ | $ | (32,220) | ​ | $ | 350,749 | ​ | $ | (81,254) | ​ | $ | 704,407 | ​ | $ | (113,474)
Schedule of credit quality indicators, by fair value, of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | AAA | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 71,388 | ​ | $ | — | ​ | $ | 71,388
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 226,131 | ​ | ​ | — | ​ | ​ | 226,131
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 405,926 | ​ | ​ | — | ​ | ​ | 405,926
Municipal securities | ​ | ​ | — | ​ | ​ | 153 | ​ | ​ | 153
Corporate debt | ​ | ​ | — | ​ | ​ | 1,920 | ​ | ​ | 1,920
Other securities | ​ |  | — | ​ |  | 771 | ​ |  | 771
Total investment securities available-for-sale | ​ | $ | 703,445 | ​ | $ | 2,844 | ​ | $ | 706,289
Summary of available-for-sale and held-to-maturity securities by maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,967 | ​ | $ | 24,848 | ​ | 2.30%
After one but within five years | ​ | ​ | 49,541 | ​ | ​ | 48,196 | ​ | 2.67%
Municipal securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | ​ | 80 | ​ | ​ | 79 | ​ | 3.17%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After five but within ten years | ​ | ​ | 2,000 | ​ | ​ | 1,843 | ​ | 5.87%
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | $ | 49,338 | ​ | $ | 48,334 | ​ | 3.14%
Held-to-maturity Securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,045 | ​ | $ | — | ​ | $ | (1,416) | ​ | $ | 47,629
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 339,815 | ​ | ​ | 163 | ​ | ​ | (41,162) | ​ | ​ | 298,816
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 262,667 | ​ |  | — | ​ |  | (49,188) | ​ |  | 213,479
Total investment securities held-to-maturity | ​ | $ | 651,527 | ​ | $ | 163 | ​ | $ | (91,766) | ​ | $ | 559,924
Summary of unrealized losses for held-to-maturity securities | The held-to-maturity portfolio included 123 securities which were in an unrealized loss position at December 31, 2023, compared to 129 securities at December 31, 2022. 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, 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | 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 | ​ | $ | 47,629 | ​ | $ | (1,416) | ​ | $ | — | ​ | $ | — | ​ | $ | 47,629 | ​ | $ | (1,416)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 83,323 | ​ | ​ | (3,804) | ​ | ​ | 182,159 | ​ | ​ | (37,358) | ​ | ​ | 265,482 | ​ | ​ | (41,162)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 34,704 | ​ | ​ | (1,145) | ​ | ​ | 178,776 | ​ | ​ | (48,043) | ​ | ​ | 213,480 | ​ | ​ | (49,188)
Total | ​ | $ | 165,656 | ​ | $ | (6,365) | ​ | $ | 360,935 | ​ | $ | (85,401) | ​ | $ | 526,591 | ​ | $ | (91,766)

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