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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Investment Securities |
Summary of available-for-sale securities | Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,757 | ​ | $ | — | ​ | $ | (567) | ​ | $ | 49,190
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | —
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 222,443 | ​ | ​ | 445 | ​ | ​ | (26,358) | ​ | ​ | 196,530
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 514,924 | ​ | ​ | 1,280 | ​ | ​ | (55,708) | ​ | ​ | 460,496
Municipal securities | ​ | ​ | 80 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 80
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (38) | ​ | ​ | 1,962
Other securities | ​ | ​ | 729 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 729
Total investment securities available-for-sale | ​ | $ | 789,933 | ​ | $ | 1,725 | ​ | $ | (82,671) | ​ | $ | 708,987
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 49,190 | ​ | $ | (567) | ​ | $ | 49,190 | ​ | $ | (567)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 181,541 | ​ | ​ | (26,358) | ​ | ​ | 181,541 | ​ | ​ | (26,358)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 16,334 | ​ | ​ | (21) | ​ | ​ | 321,668 | ​ | ​ | (55,687) | ​ | ​ | 338,002 | ​ | ​ | (55,708)
Municipal securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 80 | ​ | ​ | — | ​ | ​ | 80 | ​ | ​ | —
Corporate debt | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,963 | ​ | ​ | (38) | ​ | ​ | 1,963 | ​ | ​ | (38)
Total | ​ | $ | 16,334 | ​ | $ | (21) | ​ | $ | 554,442 | ​ | $ | (82,650) | ​ | $ | 570,776 | ​ | $ | (82,671)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | The tables below summarize the credit quality indicators, by fair value, of available-for-sale securities as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | AA+ | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 49,190 | ​ | $ | — | ​ | $ | 49,190
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 196,530 | ​ | ​ | — | ​ | ​ | 196,530
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 460,496 | ​ | ​ | — | ​ | ​ | 460,496
Municipal securities | ​ | ​ | — | ​ | ​ | 80 | ​ | ​ | 80
Corporate debt | ​ | ​ | — | ​ | ​ | 1,962 | ​ | ​ | 1,962
Other securities | ​ | ​ | — | ​ | ​ | 729 | ​ | ​ | 729
Total investment securities available-for-sale | ​ | $ | 706,216 | ​ | $ | 2,771 | ​ | $ | 708,987
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | A summary of the available-for-sale securities by maturity is shown in the following table as of September 30, 2024. 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 September 30, 2024 that have no stated contractual maturity date. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,909 | ​ | $ | 24,712 | ​ | 2.56%
After one but within five years | ​ | ​ | 24,848 | ​ | ​ | 24,478 | ​ | 2.77%
Total U.S. Treasury securities | ​ | ​ | 49,757 | ​ | ​ | 49,190 | ​ | 2.67%
Municipal securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | ​ | 80 | ​ | ​ | 80 | ​ | 3.14%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After five but within ten years | ​ | ​ | 2,000 | ​ | ​ | 1,962 | ​ | 5.86%
Total | ​ | $ | 51,837 | ​ | $ | 51,232 | ​ | ​
A summary of the held-to-maturity securities by maturity is shown in the following table as of September 30, 2024. 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. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized cost | ​ | Fair value | ​ | average yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,956 | ​ | $ | 24,794 | ​ | 3.18%
After one but within five years | ​ | ​ | 24,607 | ​ | ​ | 24,363 | ​ | 3.10%
Total | ​ | $ | 49,563 | ​ | $ | 49,157 | ​ | 3.14%
Summary of held-to-maturity securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,563 | ​ | $ | — | ​ | $ | (406) | ​ | $ | 49,157
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 270,518 | ​ | ​ | 705 | ​ | ​ | (28,386) | ​ | ​ | 242,837
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 218,076 | ​ | ​ | 26 | ​ | ​ | (39,322) | ​ | ​ | 178,780
Total investment securities held-to-maturity | ​ | $ | 538,157 | ​ | $ | 731 | ​ | $ | (68,114) | ​ | $ | 470,774
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 109 securities which were in an unrealized loss position as of September 30, 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 49,157 | ​ | $ | (406) | ​ | $ | 49,157 | ​ | $ | (406)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 201,590 | ​ | ​ | (28,386) | ​ | ​ | 201,590 | ​ | ​ | (28,386)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 175,839 | ​ | ​ | (39,322) | ​ | ​ | 175,839 | ​ | ​ | (39,322)
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 426,586 | ​ | $ | (68,114) | ​ | $ | 426,586 | ​ | $ | (68,114)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 tables below summarize the credit quality indicators, by amortized cost, of held-to-maturity securities as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2024 | ​ | December 31, 2023
​ | ​ | AA+ | ​ | AAA
U.S. Treasury securities | ​ | $ | 49,563 | ​ | $ | 49,338
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 270,518 | ​ | ​ | 299,337
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | ​ | ​ | 218,076 | ​ | ​ | 236,377
Total investment securities held-to-maturity | ​ | $ | 538,157 | ​ | $ | 585,052

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