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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Investment Securities |
Available-for-sale Securities | Available-for-sale securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ |  | Amortized |  | Gross |  | Gross |  | ​ | ​
​ | ​ | cost | ​ | unrealized gains | ​ | unrealized losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 74,148 | ​ | $ | — | ​ | $ | (1,994) | ​ | $ | 72,154
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 256,267 | ​ | ​ | 18 | ​ | ​ | (34,076) | ​ | ​ | 222,209
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 463,907 | ​ |  | — | ​ |  | (65,625) | ​ |  | 398,282
Municipal securities | ​ | ​ | 155 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 154
Corporate debt | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (108) | ​ | ​ | 1,892
Other securities | ​ |  | 794 | ​ |  | — | ​ |  | — | ​ |  | 794
Total investment securities available-for-sale | ​ | $ | 797,271 | ​ | $ | 18 | ​ | $ | (101,804) | ​ | $ | 695,485
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 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 | ​ | $ | 72,153 | ​ | $ | (1,994) | ​ | $ | — | ​ | $ | — | ​ | $ | 72,153 | ​ | $ | (1,994)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 43,304 | ​ | ​ | (2,112) | ​ | ​ | 175,914 | ​ | ​ | (31,964) | ​ | ​ | 219,218 | ​ | ​ | (34,076)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 25,905 | ​ | ​ | (1,745) | ​ | ​ | 372,230 | ​ | ​ | (63,880) | ​ | ​ | 398,135 | ​ | ​ | (65,625)
Municipal securities | ​ | ​ | 154 | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 154 | ​ | ​ | (1)
Corporate debt | ​ | ​ | 1,892 | ​ | ​ | (108) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,892 | ​ | ​ | (108)
Total | ​ | $ | 143,408 | ​ | $ | (5,960) | ​ | $ | 548,144 | ​ | $ | (95,844) | ​ | $ | 691,552 | ​ | $ | (101,804)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​
Summary of available-for-sale and held-to-maturity securities by maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | $ | 74,148 | ​ | $ | 72,154 | ​ | 2.54%
Municipal securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | ​ | 155 | ​ | ​ | 154 | ​ | 3.17%
Corporate debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After five but within ten years | ​ | ​ | 2,000 | ​ | ​ | 1,892 | ​ | 5.87%
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Amortized Cost | ​ | Fair Value | ​ | Average Yield
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
After one but within five years | ​ | $ | 49,117 | ​ | $ | 48,141 | ​ | 3.14%
​
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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ | ​ | AAA | ​ | Not rated | ​ | Total
U.S. Treasury securities | ​ | $ | 72,154 | ​ | $ | — | ​ | $ | 72,154
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 222,209 | ​ | ​ | — | ​ | ​ | 222,209
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 398,282 | ​ | ​ | — | ​ | ​ | 398,282
Municipal securities | ​ | ​ | — | ​ | ​ | 154 | ​ | ​ | 154
Corporate debt | ​ | ​ | — | ​ | ​ | 1,892 | ​ | ​ | 1,892
Other securities | ​ |  | — | ​ |  | 794 | ​ |  | 794
Total investment securities available-for-sale | ​ | $ | 692,645 | ​ | $ | 2,840 | ​ | $ | 695,485
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
Held-to-maturity Securities | Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | ​ | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | Fair value
U.S. Treasury securities | ​ | $ | 49,117 | ​ | $ | — | ​ | $ | (976) | ​ | $ | 48,141
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 331,996 | ​ | ​ | 529 | ​ | ​ | (37,279) | ​ | ​ | 295,246
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 256,808 | ​ |  | 28 | ​ |  | (44,967) | ​ |  | 211,869
Total investment securities held-to-maturity | ​ | $ | 637,921 | ​ | $ | 557 | ​ | $ | (83,222) | ​ | $ | 555,256
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 111 securities which were in an unrealized loss position as of March 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 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 | ​ | $ | 48,141 | ​ | $ | (976) | ​ | $ | — | ​ | $ | — | ​ | $ | 48,141 | ​ | $ | (976)
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 48,855 | ​ | ​ | (1,481) | ​ | ​ | 195,980 | ​ | ​ | (35,798) | ​ | ​ | 244,835 | ​ | ​ | (37,279)
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 23,337 | ​ | ​ | (684) | ​ | ​ | 185,348 | ​ | ​ | (44,283) | ​ | ​ | 208,685 | ​ | ​ | (44,967)
Total | ​ | $ | 120,333 | ​ | $ | (3,141) | ​ | $ | 381,328 | ​ | $ | (80,081) | ​ | $ | 501,661 | ​ | $ | (83,222)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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: ​
​ | ​ | ​ | ​
​ | ​ | March 31, 2023
​ | ​ | AAA
U.S. Treasury securities | ​ | $ | 49,117
Mortgage-backed securities: | ​ | ​ | ​
Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ | ​ | 331,996
Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises | ​ |  | 256,808
Total investment securities held-to-maturity | ​ | $ | 637,921
​
​ | ​ | ​ | ​
​ | ​ | 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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