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Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized cost, unrealized gains and losses and fair values of securities classified available for sale and held to maturity | The tables below provide the amortized cost, unrealized gains and losses, and fair values of debt securities summarized by major category (dollars in thousands):
| As of September 30, 2023
| Amortized Cost |  | Unrealized |  | Fair Value
Gross Gains |  | Gross Losses
Debt securities available for sale |  |  |  |  |  |  |
U.S. Treasury securities | $ | 51,522 |  |  | $ | — |  |  | $ | (1,392) |  |  | $ | 50,130 |
Obligations of U.S. government corporations and agencies | 10,071 |  |  | 2 |  |  | (254) |  |  | 9,819 |
Obligations of states and political subdivisions 1 | 254,549 |  |  | 6 |  |  | (27,758) |  |  | 226,797 |
Asset-backed securities | 486,517 |  |  | — |  |  | (7,069) |  |  | 479,448 |
Commercial mortgage-backed securities | 120,117 |  |  | — |  |  | (19,817) |  |  | 100,300 |
Residential mortgage-backed securities 2 | 1,343,324 |  |  | — |  |  | (254,528) |  |  | 1,088,796 |
Corporate debt securities | 251,194 |  |  | 91 |  |  | (23,734) |  |  | 227,551 |
Total debt securities available for sale | $ | 2,517,294 |  |  | $ | 99 |  |  | $ | (334,552) |  |  | $ | 2,182,841 |
___________________________________________ 1.Includes securities marked at par, with no gain or loss to report. 2.Gross gains on Residential mortgage-backed securities were insignificant, rounding to zero thousand.
| Amortized Cost |  | Unrecognized |  | Fair Value
Gross Gains |  | Gross Losses
Debt securities held to maturity |  |  |  |  |  |  |
Commercial mortgage-backed securities | $ | 459,866 |  |  | $ | — |  |  | $ | (93,401) |  |  | $ | 366,465 |
Residential mortgage-backed securities | 422,748 |  |  | — |  |  | (87,537) |  |  | 335,211 |
Total debt securities held to maturity | $ | 882,614 |  |  | $ | — |  |  | $ | (180,938) |  |  | $ | 701,676 |
| As of December 31, 2022
| Amortized Cost |  | Unrealized |  | Fair Value
Gross Gains |  | Gross Losses
Debt securities available for sale |  |  |  |  |  |  |
U.S. Treasury securities | $ | 117,805 |  |  | $ | — |  |  | $ | (3,744) |  |  | $ | 114,061 |
Obligations of U.S. government corporations and agencies | 20,097 |  |  | 3 |  |  | (321) |  |  | 19,779 |
Obligations of states and political subdivisions | 283,481 |  |  | 106 |  |  | (26,075) |  |  | 257,512 |
Asset-backed securities | 489,558 |  |  | — |  |  | (19,683) |  |  | 469,875 |
Commercial mortgage-backed securities | 124,423 |  |  | — |  |  | (16,029) |  |  | 108,394 |
Residential mortgage-backed securities | 1,463,971 |  |  | 2 |  |  | (220,717) |  |  | 1,243,256 |
Corporate debt securities | 273,118 |  |  | 33 |  |  | (24,635) |  |  | 248,516 |
Total debt securities available for sale | $ | 2,772,453 |  |  | $ | 144 |  |  | $ | (311,204) |  |  | $ | 2,461,393 |
| Amortized Cost |  | Unrecognized |  | Fair Value
Gross Gains |  | Gross Losses
Debt securities held to maturity |  |  |  |  |  |  |
Commercial mortgage-backed securities | $ | 474,820 |  |  | $ | — |  |  | $ | (63,738) |  |  | $ | 411,082 |
Residential mortgage-backed securities | 443,492 |  |  | — |  |  | (69,279) |  |  | 374,213 |
Total debt securities held to maturity | $ | 918,312 |  |  | $ | — |  |  | $ | (133,017) |  |  | $ | 785,295 |
Maturities of debt securities | All mortgage-backed securities were issued by U.S. government corporations and agencies (dollars in thousands):
| As of September 30, 2023
| Amortized Cost |  | Fair Value
Debt securities available for sale |  |  |
Due in one year or less | $ | 109,189 |  |  | $ | 106,940 |
Due after one year through five years | 312,419 |  |  | 289,027 |
Due after five years through ten years | 431,297 |  |  | 389,702 |
Due after ten years | 1,664,389 |  |  | 1,397,172 |
Debt securities available for sale | $ | 2,517,294 |  |  | $ | 2,182,841 |
Debt securities held to maturity |  |  |
Due after one year through five years | $ | 63,474 |  |  | $ | 58,144 |
Due after five years through ten years | 40,076 |  |  | 34,985 |
Due after ten years | 779,064 |  |  | 608,547 |
Debt securities held to maturity | $ | 882,614 |  |  | $ | 701,676 |
Gains and losses on debt securities | Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Realized gains and losses on debt securities |  |  |  |  |  |  |
Gross gains on debt securities | $ | 10 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 114 |
Gross (losses) on debt securities | (43) |  | (74) |  | (227) |  | (86)
Realized net gains (losses) on debt securities 1 | $ | (33) |  |  | $ | (74) |  |  | $ | (207) |  |  | $ | 28 |
___________________________________________ 1.Net gains (losses) on sales of securities reported in the Consolidated Statements of Income (Unaudited) include sales of equity securities, excluded in this table.
Debt securities in an unrealized loss position | The following information pertains to debt securities with gross unrealized or unrecognized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (dollars in thousands):
| As of September 30, 2023
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Debt securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | — |  |  | $ | — |  |  | $ | 50,130 |  |  | $ | (1,392) |  |  | $ | 50,130 |  |  | $ | (1,392) |
Obligations of U.S. government corporations and agencies | 1,983 |  |  | (6) |  |  | 7,699 |  |  | (248) |  |  | 9,682 |  |  | (254) |
Obligations of states and political subdivisions | 45,778 |  |  | (1,219) |  |  | 177,195 |  |  | (26,539) |  |  | 222,973 |  |  | (27,758) |
Asset-backed securities | — |  |  | — |  |  | 479,448 |  |  | (7,069) |  |  | 479,448 |  |  | (7,069) |
Commercial mortgage-backed securities | — |  |  | — |  |  | 100,300 |  |  | (19,817) |  |  | 100,300 |  |  | (19,817) |
Residential mortgage-backed securities | 431 |  |  | (10) |  |  | 1,088,344 |  |  | (254,518) |  |  | 1,088,775 |  |  | (254,528) |
Corporate debt securities | 1,457 |  |  | (2) |  |  | 219,074 |  |  | (23,732) |  |  | 220,531 |  |  | (23,734) |
Debt securities available for sale with gross unrealized losses | $ | 49,649 |  |  | $ | (1,237) |  |  | $ | 2,122,190 |  |  | $ | (333,315) |  |  | $ | 2,171,839 |  |  | $ | (334,552) |
|  |  | 12 months or more |  | Total
|  |  |  |  | Fair Value |  | Unrecognized Losses |  | Fair Value |  | Unrecognized Losses
Debt securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  |  |  |  | $ | 366,465 |  |  | $ | (93,401) |  |  | $ | 366,465 |  |  | $ | (93,401) |
Residential mortgage-backed securities |  |  |  |  | 335,211 |  |  | (87,537) |  |  | 335,211 |  |  | (87,537) |
Debt securities held to maturity with gross unrecognized losses |  |  |  |  | $ | 701,676 |  |  | $ | (180,938) |  |  | $ | 701,676 |  |  | $ | (180,938) |
| As of December 31, 2022
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Debt securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities 1 | $ | 74 |  |  | $ | — |  |  | $ | 113,987 |  |  | $ | (3,744) |  |  | $ | 114,061 |  |  | $ | (3,744) |
Obligations of U.S. government corporations and agencies | 19,603 |  |  | (321) |  |  | — |  |  | — |  |  | 19,603 |  |  | (321) |
Obligations of states and political subdivisions | 166,147 |  |  | (10,059) |  |  | 75,217 |  |  | (16,016) |  |  | 241,364 |  |  | (26,075) |
Asset-backed securities | 390,164 |  |  | (15,648) |  |  | 79,711 |  |  | (4,035) |  |  | 469,875 |  |  | (19,683) |
Commercial mortgage-backed securities | 89,428 |  |  | (12,623) |  |  | 18,966 |  |  | (3,406) |  |  | 108,394 |  |  | (16,029) |
Residential mortgage-backed securities | 366,221 |  |  | (38,111) |  |  | 876,668 |  |  | (182,606) |  |  | 1,242,889 |  |  | (220,717) |
Corporate debt securities | 39,037 |  |  | (5,079) |  |  | 204,310 |  |  | (19,556) |  |  | 243,347 |  |  | (24,635) |
Debt securities available for sale with gross unrealized losses | $ | 1,070,674 |  |  | $ | (81,841) |  |  | $ | 1,368,859 |  |  | $ | (229,363) |  |  | $ | 2,439,533 |  |  | $ | (311,204) |
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrecognized Losses |  | Fair Value |  | Unrecognized Losses |  | Fair Value |  | Unrecognized Losses
Debt securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities | $ | 58,065 |  |  | $ | (8,009) |  |  | $ | 353,017 |  |  | $ | (55,729) |  |  | $ | 411,082 |  |  | $ | (63,738) |
Residential mortgage-backed securities | — |  |  | — |  |  | 374,213 |  |  | (69,279) |  |  | 374,213 |  |  | (69,279) |
Debt securities held to maturity with gross unrecognized losses | $ | 58,065 |  |  | $ | (8,009) |  |  | $ | 727,230 |  |  | $ | (125,008) |  |  | $ | 785,295 |  |  | $ | (133,017) |
___________________________________________ 1.Unrealized losses for U.S. Treasury securities that had been in a continuous unrealized loss position for less than 12 months were insignificant, rounding to zero thousand. Additional information about debt securities in an unrealized or unrecognized loss position is presented in the tables below (dollars in thousands):
| As of September 30, 2023
| Available for Sale |  | Held to Maturity |  | Total
Debt securities with gross unrealized or unrecognized losses, fair value | $ | 2,171,839 |  |  | $ | 701,676 |  |  | $ | 2,873,515 |
Gross unrealized or unrecognized losses on debt securities | 334,552 |  |  | 180,938 |  |  | 515,490 |
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses | 15.4 | % |  | 25.8 | % |  | 17.9 | %
Count of debt securities | 1,001 |  |  | 55 |  |  | 1,056 |
Count of debt securities in an unrealized or unrecognized loss position | 982 |  |  | 55 |  |  | 1,037 |
| As of December 31, 2022
| Available for Sale |  | Held to Maturity |  | Total
Debt securities with gross unrealized or unrecognized losses, fair value | $ | 2,439,533 |  |  | $ | 785,295 |  |  | $ | 3,224,828 |
Gross unrealized or unrecognized losses on debt securities | 311,204 |  |  | 133,017 |  |  | 444,221 |
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses | 12.8 | % |  | 16.9 | % |  | 13.8 | %
Count of debt securities | 1,091 |  |  | 55 |  |  | 1,146 |
Count of debt securities in an unrealized or unrecognized loss position | 1,032 |  |  | 55 |  |  | 1,087 |

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