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Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Debt Securities, Available-for-Sale and Held-to-Maturity | The amortized cost, estimated fair value, and allowance for securities credit losses of debt securities available-for-sale and held-to-maturity at September 30, 2023 and December 31, 2022 are as follows (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses
At September 30, 2023 |  |  |  |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |  |  |  |
U.S. government and agency obligations | $ | 71,895 |  |  | $ | — |  |  | $ | (7,815) |  |  | $ | 64,080 |  |  | $ | — |
Corporate debt securities | 10,084 |  |  | — |  |  | (1,132) |  |  | 8,952 |  |  | — |
Asset-backed securities | 296,212 |  |  | — |  |  | (5,768) |  |  | 290,444 |  |  | — |
Agency commercial mortgage-backed securities (“MBS”) | 109,827 |  |  | — |  |  | (20,095) |  |  | 89,732 |  |  | — |
Total debt securities available-for-sale | $ | 488,018 |  |  | $ | — |  |  | $ | (34,810) |  |  | $ | 453,208 |  |  | $ | — |
Debt securities held-to-maturity: |  |  |  |  |  |  |  |  |
State and municipal debt obligations | $ | 228,779 |  |  | $ | 30 |  |  | $ | (26,705) |  |  | $ | 202,104 |  |  | $ | (41) |
Corporate debt securities | 71,430 |  |  | 373 |  |  | (6,106) |  |  | 65,697 |  |  | (868) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency residential | 787,875 |  |  | 3 |  |  | (103,865) |  |  | 684,013 |  |  | — |
Agency commercial | 83,322 |  |  | 16 |  |  | (6,392) |  |  | 76,946 |  |  | (16) |
Non-agency commercial | 20,760 |  |  | — |  |  | (2,178) |  |  | 18,582 |  |  | (7) |
Total mortgage-backed securities | 891,957 |  |  | 19 |  |  | (112,435) |  |  | 779,541 |  |  | (23) |
Total debt securities held-to-maturity | $ | 1,192,166 |  |  | $ | 422 |  |  | $ | (145,246) |  |  | $ | 1,047,342 |  |  | $ | (932) |
Total debt securities | $ | 1,680,184 |  |  | $ | 422 |  |  | $ | (180,056) |  |  | $ | 1,500,550 |  |  | $ | (932) |
At December 31, 2022 |  |  |  |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |  |  |  |
U.S. government and agency obligations | $ | 87,648 |  |  | $ | 1 |  |  | $ | (7,635) |  |  | $ | 80,014 |  |  | $ | — |
Corporate debt securities | 8,928 |  |  | — |  |  | (756) |  |  | 8,172 |  |  | — |
Asset-backed securities | 296,222 |  |  | — |  |  | (19,349) |  |  | 276,873 |  |  | — |
Agency commercial MBS | 110,606 |  |  | — |  |  | (18,017) |  |  | 92,589 |  |  | — |
Total debt securities available-for-sale | $ | 503,404 |  |  | $ | 1 |  |  | $ | (45,757) |  |  | $ | 457,648 |  |  | $ | — |
Debt securities held-to-maturity: |  |  |  |  |  |  |  |  |
State, municipal, and sovereign debt obligations | $ | 260,249 |  |  | $ | 46 |  |  | $ | (24,940) |  |  | $ | 235,355 |  |  | $ | (60) |
Corporate debt securities | 56,893 |  |  | 380 |  |  | (3,778) |  |  | 53,495 |  |  | (1,059) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency residential | 849,985 |  |  | 795 |  |  | (83,586) |  |  | 767,194 |  |  | — |
Agency commercial | 32,127 |  |  | 23 |  |  | (1,189) |  |  | 30,961 |  |  | — |
Non-agency commercial | 25,310 |  |  | — |  |  | (2,274) |  |  | 23,036 |  |  | (9) |
Total mortgage-backed securities | 907,422 |  |  | 818 |  |  | (87,049) |  |  | 821,191 |  |  | (9) |
Total debt securities held-to-maturity | $ | 1,224,564 |  |  | $ | 1,244 |  |  | $ | (115,767) |  |  | $ | 1,110,041 |  |  | $ | (1,128) |
Total debt securities | $ | 1,727,968 |  |  | $ | 1,245 |  |  | $ | (161,524) |  |  | $ | 1,567,689 |  |  | $ | (1,128) |
Schedule of Allowance for Credit Losses for Debt Securities Held-to-Maturity | The following table presents the activity in the allowance for credit losses for debt securities held-to-maturity for the three and nine months ended September 30, 2023 and 2022 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Allowance for securities credit losses |  |  |  |  |  |  |
Beginning balance | $ | (964) |  |  | $ | (1,293) |  |  | $ | (1,128) |  |  | $ | (1,467) |
Provision for credit loss benefit | 32 |  |  | 59 |  |  | 196 |  |  | 233 |
Total ending allowance balance | $ | (932) |  |  | $ | (1,234) |  |  | $ | (932) |  |  | $ | (1,234) |
Schedule of Amortized Cost of Debt Securities Held-to-Maturity, Aggregated by Credit Quality Indicator | Under this approach, the amortized cost of debt securities held-to-maturity at September 30, 2023, aggregated by credit quality indicator, are as follows (in thousands):
| Investment Grade |  | Non-Investment Grade/Non-rated |  | Total
As of September 30, 2023 |  |  |  |  |
State and municipal debt obligations | $ | 228,779 |  |  | $ | — |  |  | $ | 228,779 |
Corporate debt securities | 57,050 |  |  | 14,380 |  |  | 71,430 |
Agency commercial MBS | 83,323 |  |  | — |  |  | 83,323 |
Non-agency commercial MBS | 20,760 |  |  | — |  |  | 20,760 |
Total debt securities held-to-maturity | $ | 389,912 |  |  | $ | 14,380 |  |  | $ | 404,292 |
Schedule of Carrying Value of Debt Securities Held-to-Maturity and Equity Investment | The carrying value of debt securities held-to-maturity at September 30, 2023 and December 31, 2022 was as follows (in thousands):
| September 30, |  | December 31,
| 2023 |  | 2022
Amortized cost | $ | 1,192,166 |  |  | $ | 1,224,564 |
Allowance for securities credit losses | (932) |  |  | (1,128) |
Net loss on date of transfer from available-for-sale | (13,556) |  |  | (13,556) |
Accretion of net unrealized loss on securities reclassified as held-to-maturity | 11,661 |  |  | 11,258 |
Carrying value | $ | 1,189,339 |  |  | $ | 1,221,138 |
The realized and unrealized gains or losses on equity securities for the three and nine months ended September 30, 2023 and 2022 are shown in the table below (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Net gain (loss) on equity investments | $ | 1,452 |  |  | $ | 3,362 |  |  | $ | (5,908) |  |  | $ | (7,502) |
Less: Net (losses) gains recognized on equity investments sold | — |  |  | — |  |  | (5,462) |  |  | 1,351 |
Unrealized gains (losses) recognized on equity investments still held | $ | 1,452 |  |  | $ | 3,362 |  |  | $ | (446) |  |  | $ | (8,853) |
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity | The amortized cost and estimated fair value of debt securities at September 30, 2023 by contractual maturity are shown below (in thousands):
September 30, 2023 | Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 39,412 |  |  | $ | 38,958 |
Due after one year through five years | 183,574 |  |  | 166,592 |
Due after five years through ten years | 205,459 |  |  | 192,786 |
Due after ten years | 249,955 |  |  | 232,941 |
| $ | 678,400 |  |  | $ | 631,277 |
Schedule of Estimated Fair Value and Unrealized Losses for Debt Securities Available-for-Sale and Held-to-Maturity | The estimated fair value and unrealized losses for debt securities available-for-sale and held-to-maturity at September 30, 2023 and December 31, 2022, segregated by the duration of the unrealized losses, are as follows (in thousands):
| Less than 12 months |  | 12 months or longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
At September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations | $ | 1,060 |  |  | $ | (11) |  |  | $ | 63,020 |  |  | $ | (7,804) |  |  | $ | 64,080 |  |  | $ | (7,815) |
Corporate debt securities | 6,519 |  |  | (565) |  |  | 2,433 |  |  | (567) |  |  | 8,952 |  |  | (1,132) |
Asset-backed securities | — |  |  | — |  |  | 290,444 |  |  | (5,768) |  |  | 290,444 |  |  | (5,768) |
Agency commercial MBS | — |  |  | — |  |  | 89,732 |  |  | (20,095) |  |  | 89,732 |  |  | (20,095) |
Total debt securities available-for-sale | 7,579 |  |  | (576) |  |  | 445,629 |  |  | (34,234) |  |  | 453,208 |  |  | (34,810) |
Debt securities held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
State and municipal debt obligations | 9,266 |  |  | (397) |  |  | 187,876 |  |  | (26,308) |  |  | 197,142 |  |  | (26,705) |
Corporate debt securities | 38,247 |  |  | (3,634) |  |  | 22,687 |  |  | (2,472) |  |  | 60,934 |  |  | (6,106) |
MBS: |  |  |  |  |  |  |  |  |  |  |
Agency residential | 222,066 |  |  | (13,368) |  |  | 461,630 |  |  | (90,497) |  |  | 683,696 |  |  | (103,865) |
Agency commercial | 52,836 |  |  | (5,460) |  |  | 16,431 |  |  | (932) |  |  | 69,267 |  |  | (6,392) |
Non-agency commercial | — |  |  | — |  |  | 18,582 |  |  | (2,178) |  |  | 18,582 |  |  | (2,178) |
Total MBS | 274,902 |  |  | (18,828) |  |  | 496,643 |  |  | (93,607) |  |  | 771,545 |  |  | (112,435) |
Total debt securities held-to-maturity | 322,415 |  |  | (22,859) |  |  | 707,206 |  |  | (122,387) |  |  | 1,029,621 |  |  | (145,246) |
Total debt securities | $ | 329,994 |  |  | $ | (23,435) |  |  | $ | 1,152,835 |  |  | $ | (156,621) |  |  | $ | 1,482,829 |  |  | $ | (180,056) |
At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Debt securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations | $ | 27,232 |  |  | $ | (450) |  |  | $ | 52,782 |  |  | $ | (7,185) |  |  | $ | 80,014 |  |  | $ | (7,635) |
Corporate debt securities | 4,735 |  |  | (193) |  |  | 3,437 |  |  | (563) |  |  | 8,172 |  |  | (756) |
Asset-backed securities | 143,392 |  |  | (9,179) |  |  | 133,481 |  |  | (10,170) |  |  | 276,873 |  |  | (19,349) |
Agency commercial MBS | 8,782 |  |  | (1,675) |  |  | 83,807 |  |  | (16,342) |  |  | 92,589 |  |  | (18,017) |
Total debt securities available-for-sale | 184,141 |  |  | (11,497) |  |  | 273,507 |  |  | (34,260) |  |  | 457,648 |  |  | (45,757) |
Debt securities held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
State, municipal, and sovereign debt obligations | 133,492 |  |  | (11,952) |  |  | 97,135 |  |  | (12,988) |  |  | 230,627 |  |  | (24,940) |
Corporate debt securities | 11,783 |  |  | (598) |  |  | 36,152 |  |  | (3,180) |  |  | 47,935 |  |  | (3,778) |
MBS: |  |  |  |  |  |  |  |  |  |  |
Agency residential | 297,296 |  |  | (12,404) |  |  | 397,036 |  |  | (71,182) |  |  | 694,332 |  |  | (83,586) |
Agency commercial | 25,936 |  |  | (1,150) |  |  | 2,062 |  |  | (39) |  |  | 27,998 |  |  | (1,189) |
Non-agency commercial | 16,839 |  |  | (1,621) |  |  | 6,198 |  |  | (653) |  |  | 23,037 |  |  | (2,274) |
Total MBS | 340,071 |  |  | (15,175) |  |  | 405,296 |  |  | (71,874) |  |  | 745,367 |  |  | (87,049) |
Total debt securities held-to-maturity | 485,346 |  |  | (27,725) |  |  | 538,583 |  |  | (88,042) |  |  | 1,023,929 |  |  | (115,767) |
Total debt securities | $ | 669,487 |  |  | $ | (39,222) |  |  | $ | 812,090 |  |  | $ | (122,302) |  |  | $ | 1,481,577 |  |  | $ | (161,524) |

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