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Investment Securities | 9 Months Ended
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Sep. 30, 2023
Investment Securities |
Investment Securities | Note 3 Investment Securities ​ The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $1.2 billion at September 30, 2023 and included $0.6 billion of available-for-sale securities and $0.6 billion of held-to-maturity securities. At December 31, 2022, investment securities totaled $1.4 billion and included $0.7 billion of available-for-sale securities and $0.7 billion of held-to-maturity securities. ​ Available-for-sale ​ 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
​ During the nine months ended September 30, 2023, there were no purchases of available-for-sale securities. During the nine months ended September 30, 2022, purchases of available-for-sale securities totaled $260.2 million. Maturities and paydowns of available-for-sale securities during the nine months ended September 30, 2023 and 2022 totaled $71.3 million and $116.0 million, respectively. There were no sales of available-for-sale securities during the nine months ended September 30, 2023 or 2022. ​ At September 30, 2023 and December 31, 2022, the Company’s available-for-sale investment portfolio was primarily comprised of U.S. Treasury securities and mortgage-backed securities. All mortgage-backed securities were backed by government sponsored enterprises (“GSE”) collateral such as Federal Home Loan Mortgage Corporation (“FHLMC”) and Federal National Mortgage Association (“FNMA”) and the government owned agency Government National Mortgage Association (“GNMA”). ​ 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)
​ Management evaluated all of the available-for-sale securities in an unrealized loss position at September 30, 2023 and December 31, 2022. The portfolio included 237 securities, which were in an unrealized loss position at September 30, 2023, compared to 244 securities at December 31, 2022. The unrealized losses in the Company's investment portfolio at September 30, 2023 were caused by changes in interest rates. The Company has no intention to sell these securities and believes it will not be required to sell the securities before the recovery of their amortized cost. Management believes that default of the available-for-sale securities is highly unlikely. FHLMC, FNMA and GNMA guaranteed mortgage-backed securities and U.S. Treasury securities have a long history of zero credit losses, an explicit guarantee by the U.S. government (although limited for FNMA and FHLMC securities) and yields that generally trade based on market views of prepayment and liquidity risk rather than credit risk. ​ 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
​ Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase and to secure borrowing capacity at the Federal Reserve Bank (“FRB”), if needed. The fair value of available-for-sale investment securities pledged as collateral totaled $205.3 million and $484.9 million at September 30, 2023 and at December 31, 2022, respectively. The Bank may also pledge available-for-sale investment securities as collateral for Federal Home Loan Bank (“FHLB”) advances. No securities were pledged for this purpose at September 30, 2023 or December 31, 2022. ​ 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%
​ As of September 30, 2023 and December 31, 2022, accrued interest receivable (“AIR”) from available-for-sale investment securities totaled $1.3 million and $1.5 million, respectively, and was included within other assets in the consolidated statements of financial condition. ​ Held-to-maturity ​ 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
​ During the nine months ended September 30, 2023 and 2022, purchases of held-to-maturity securities totaled $2.5 million and $91.6 million, respectively. Maturities and paydowns of held-to-maturity securities totaled $53.9 million and $93.2 million during the nine months ended September 30, 2023 and 2022, respectively. ​ 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)
​ The Company does not measure expected credit losses on a financial asset, or group of financial assets, in which historical credit loss information adjusted for current conditions and reasonable and supportable forecasts results in an expectation that nonpayment of the amortized cost basis is zero. Management evaluated held-to-maturity securities noting they are backed by loans guaranteed by either U.S. government agencies or U.S. government sponsored entities, and management believes that default is highly unlikely given this governmental backing and long history without credit losses. Additionally, management notes that yields on which the portfolio generally trades are based upon market views of prepayment and liquidity risk and not credit risk. The Company has no intention to sell any held-to-maturity securities and believes it will not be required to sell any held-to-maturity securities before the recovery of their amortized cost. ​ 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
​ Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase and to secure borrowing capacity at the FRB, if needed. The carrying value of held-to-maturity investment securities pledged as collateral totaled $600.5 million and $355.3 million at September 30, 2023 and December 31, 2022, respectively. The Company may also pledge held-to-maturity investment securities as collateral for FHLB advances. No held-to-maturity investment securities were pledged for this purpose at September 30, 2023 or December 31, 2022. ​ 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%
​ As of September 30, 2023 and December 31, 2022, AIR from held-to-maturity investment securities totaled $1.3 million and $1.1 million, respectively, and was included within other assets in the consolidated statements of financial condition.

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