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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investment Securities |
Available-for-sale Securities | Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | Amortized |  | Gross |  | Gross |  | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 74,386 | ​ | $ | — | ​ | $ | (2,524) | ​ | $ | 71,862
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 240,292 | ​ | ​ | 14 | ​ | ​ | (43,458) | ​ | ​ | 196,848
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 430,853 | ​ |  | — | ​ |  | (81,911) | ​ |  | 348,942
Municipal securities | ​ | ​ | 155 | ​ | ​ | — | ​ | ​ | (3) | ​ | ​ | 152
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (151) | ​ | ​ | 1,849
Other securities | ​ |  | 792 | ​ |  | — | ​ |  | — | ​ |  | 792
Total investment securities available-for-sale | ​ | $ | 748,478 | ​ | $ | 14 | ​ | $ | (128,047) | ​ | $ | 620,445
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 71,862 | ​ | $ | (2,524) | ​ | $ | 71,862 | ​ | $ | (2,524)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 16 | ​ | ​ | (1) | ​ | ​ | 193,918 | ​ | ​ | (43,457) | ​ | ​ | 193,934 | ​ | ​ | (43,458)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 136 | ​ | ​ | (4) | ​ | ​ | 348,806 | ​ | ​ | (81,907) | ​ | ​ | 348,942 | ​ | ​ | (81,911)
Municipal securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 152 | ​ | ​ | (3) | ​ | ​ | 152 | ​ | ​ | (3)
Corporate debt | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,849 | ​ | ​ | (151) | ​ | ​ | 1,849 | ​ | ​ | (151)
Total | ​ | $ | 152 | ​ | $ | (5) | ​ | $ | 616,587 | ​ | $ | (128,042) | ​ | $ | 616,739 | ​ | $ | (128,047)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | The tables below summarize the credit quality indicators, by fair value, of available-for-sale securities as of the dates shown: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ | ​ | AAA | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 71,862 | ​ | $ | — | ​ | $ | 71,862
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 196,848 | ​ | ​ | — | ​ | ​ | 196,848
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 348,942 | ​ | ​ | — | ​ | ​ | 348,942
Municipal securities | ​ | ​ | — | ​ | ​ | 152 | ​ | ​ | 152
Corporate debt | ​ | ​ | — | ​ | ​ | 1,849 | ​ | ​ | 1,849
Other securities | ​ |  | — | ​ |  | 792 | ​ |  | 792
Total investment securities available-for-sale | ​ | $ | 617,652 | ​ | $ | 2,793 | ​ | $ | 620,445
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | A summary of the available-for-sale securities by maturity is shown in the following table as of September 30, 2023. 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 $0.8 million that have no stated contractual maturity date. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 24,917 | ​ | $ | 24,598 | ​ | 2.30%
After one but within five years | ​ | ​ | 49,469 | ​ | ​ | 47,264 | ​ | 2.67%
Municipal securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | ​ | 155 | ​ | ​ | 152 | ​ | 3.17%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After five but within ten years | ​ | ​ | 2,000 | ​ | ​ | 1,849 | ​ | 5.87%
A summary of the held-to-maturity securities by maturity is shown in the following table as of September 30, 2023. 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, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | $ | 49,263 | ​ | $ | 47,415 | ​ | 3.14%
Held-to-maturity Securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,263 | ​ | $ | — | ​ | $ | (1,848) | ​ | $ | 47,415
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 309,216 | ​ | ​ | — | ​ | ​ | (49,023) | ​ | ​ | 260,193
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 242,022 | ​ |  | — | ​ |  | (55,388) | ​ |  | 186,634
Total investment securities held-to-maturity | ​ | $ | 600,501 | ​ | $ | — | ​ | $ | (106,259) | ​ | $ | 494,242
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 160 securities in an unrealized loss position as of September 30, 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | 47,415 | ​ | $ | (1,848) | ​ | $ | 47,415 | ​ | $ | (1,848)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 53,423 | ​ | ​ | (2,086) | ​ | ​ | 206,771 | ​ | ​ | (46,937) | ​ | ​ | 260,194 | ​ | ​ | (49,023)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 3,882 | ​ | ​ | (170) | ​ | ​ | 182,752 | ​ | ​ | (55,218) | ​ | ​ | 186,634 | ​ | ​ | (55,388)
Total | ​ | $ | 57,305 | ​ | $ | (2,256) | ​ | $ | 436,938 | ​ | $ | (104,003) | ​ | $ | 494,243 | ​ | $ | (106,259)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
Schedule 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, 2023
​ | ​ | AAA
U.S. Treasury securities | ​ | $ | 49,263
Mortgage-backed securities: | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 309,216
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 242,022
Total investment securities held-to-maturity | ​ | $ | 600,501
​
​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | AAA
U.S. Treasury securities | ​ | $ | 49,045
Mortgage-backed securities: | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 339,815
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 262,667
Total investment securities held-to-maturity | ​ | $ | 651,527

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