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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Debt Securities, Held-to-maturity | The amortized cost, fair value and allowance for credit losses of investment securities that are classified as HTM are as follows:
(In thousands) | Amortized Cost |  | Allowance for Credit Losses |  | Net Carrying Amount |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |
March 31, 2025 |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | $ | 456,545 |  |  | $ | — |  |  | $ | 456,545 |  |  | $ | — |  |  | $ | (83,796) |  |  | $ | 372,749 |
Mortgage-backed securities | 1,048,170 |  |  | — |  |  | 1,048,170 |  |  | 313 |  |  | (111,288) |  |  | 937,195 |
State and political subdivisions | 1,857,076 |  |  | (171) |  |  | 1,856,905 |  |  | 44 |  |  | (474,041) |  |  | 1,382,908 |
Other securities | 256,979 |  |  | (3,043) |  |  | 253,936 |  |  | — |  |  | (17,163) |  |  | 236,773 |
Total HTM | $ | 3,618,770 |  |  | $ | (3,214) |  |  | $ | 3,615,556 |  |  | $ | 357 |  |  | $ | (686,288) |  |  | $ | 2,929,625 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | $ | 455,869 |  |  | $ | — |  |  | $ | 455,869 |  |  | $ | — |  |  | $ | (95,961) |  |  | $ | 359,908 |
Mortgage-backed securities | 1,070,032 |  |  | — |  |  | 1,070,032 |  |  | 212 |  |  | (133,746) |  |  | 936,498 |
State and political subdivisions | 1,857,373 |  |  | (196) |  |  | 1,857,177 |  |  | 20 |  |  | (436,061) |  |  | 1,421,136 |
Other securities | 256,576 |  |  | (3,018) |  |  | 253,558 |  |  | — |  |  | (21,149) |  |  | 232,409 |
Total HTM | $ | 3,639,850 |  |  | $ | (3,214) |  |  | $ | 3,636,636 |  |  | $ | 232 |  |  | $ | (686,917) |  |  | $ | 2,949,951 |
Schedule of Debt Securities, Available-for-sale | The amortized cost, fair value and allowance for credit losses of investment securities that are classified as AFS are as follows:
(In thousands) | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value
Available-for-sale |  |  |  |  |  |  |  |  |
March 31, 2025 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 700 |  |  | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | 699 |
U.S. Government agencies | 53,173 |  |  | — |  |  | 3 |  |  | (858) |  |  | 52,318 |
Mortgage-backed securities | 1,508,611 |  |  | — |  |  | 72 |  |  | (127,770) |  |  | 1,380,913 |
State and political subdivisions | 1,031,456 |  |  | — |  |  | 21 |  |  | (198,579) |  |  | 832,898 |
Other securities | 235,000 |  |  | — |  |  | 210 |  |  | (10,189) |  |  | 225,021 |
Total AFS | $ | 2,828,940 |  |  | $ | — |  |  | $ | 306 |  |  | $ | (337,397) |  |  | $ | 2,491,849 |
December 31, 2024 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 999 |  |  | $ | — |  |  | $ | — |  |  | $ | (3) |  |  | $ | 996 |
U.S. Government agencies | 55,589 |  |  | — |  |  | 5 |  |  | (1,047) |  |  | 54,547 |
Mortgage-backed securities | 1,545,539 |  |  | — |  |  | 4 |  |  | (152,784) |  |  | 1,392,759 |
State and political subdivisions | 1,015,619 |  |  | — |  |  | 132 |  |  | (157,569) |  |  | 858,182 |
Other securities | 235,028 |  |  | — |  |  | 166 |  |  | (12,252) |  |  | 222,942 |
Total AFS | $ | 2,852,774 |  |  | $ | — |  |  | $ | 307 |  |  | $ | (323,655) |  |  | $ | 2,529,426 |
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | The following table summarizes the Company’s AFS investments in an unrealized loss position for which an allowance for credit loss has not been recorded as of March 31, 2025 and December 31, 2024, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
| Less Than 12 Months |  | 12 Months or More |  | Total
(In thousands) | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
Available-for-sale |  |  |  |  |  |  |  |  |  |  |
March 31, 2025 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 699 |  |  | $ | (1) |  |  | $ | 699 |  |  | $ | (1) |
U.S. Government agencies | 1,708 |  |  | (21) |  |  | 49,184 |  |  | (837) |  |  | 50,892 |  |  | (858) |
Mortgage-backed securities | 7,055 |  |  | (15) |  |  | 1,364,722 |  |  | (127,755) |  |  | 1,371,777 |  |  | (127,770) |
State and political subdivisions | 14,153 |  |  | (192) |  |  | 806,319 |  |  | (198,387) |  |  | 820,472 |  |  | (198,579) |
Other securities | 4,925 |  |  | (75) |  |  | 163,462 |  |  | (10,114) |  |  | 168,387 |  |  | (10,189) |
Total AFS | $ | 27,841 |  |  | $ | (303) |  |  | $ | 2,384,386 |  |  | $ | (337,094) |  |  | $ | 2,412,227 |  |  | $ | (337,397) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 996 |  |  | $ | (3) |  |  | $ | 996 |  |  | $ | (3) |
U.S. Government agencies | 717 |  |  | (7) |  |  | 51,186 |  |  | (1,040) |  |  | 51,903 |  |  | (1,047) |
Mortgage-backed securities | 7,480 |  |  | (189) |  |  | 1,384,532 |  |  | (152,595) |  |  | 1,392,012 |  |  | (152,784) |
State and political subdivisions | 16,843 |  |  | (195) |  |  | 829,754 |  |  | (157,374) |  |  | 846,597 |  |  | (157,569) |
Other securities | 12,912 |  |  | (20) |  |  | 162,803 |  |  | (12,232) |  |  | 175,715 |  |  | (12,252) |
Total AFS | $ | 37,952 |  |  | $ | (411) |  |  | $ | 2,429,271 |  |  | $ | (323,244) |  |  | $ | 2,467,223 |  |  | $ | (323,655) |
Schedule of Debt Securities, Allowance for Credit Loss | The following table details activity in the allowance for credit losses by investment security type for the three months ended March 31, 2025 on the Company’s HTM securities portfolio.
(In thousands) | State and Political Subdivisions |  | Other Securities |  | Total
Three Months Ended March 31, 2025 |  |  |  |  |
Held-to-maturity |  |  |  |  |
Beginning balance, January 1, 2025 | $ | 196 |  |  | $ | 3,018 |  |  | $ | 3,214 |
Provision for credit loss expense | — |  |  | — |  |  | — |
Net (decrease) increase in allowance on previously impaired securities | (25) |  |  | 25 |  |  | — |
Ending balance, March 31, 2025 | $ | 171 |  |  | $ | 3,043 |  |  | $ | 3,214 |
Activity in the allowance for credit losses by investment security type for the three months ended March 31, 2024 on the Company’s HTM securities portfolio was as follows:
(In thousands) | State and Political Subdivisions |  | Other Securities |  | Total
Three Months Ended March 31, 2024 |  |  |  |  |
Held-to-maturity |  |  |  |  |
Beginning balance, January 1, 2024 | $ | 2,006 |  |  | $ | 1,208 |  |  | $ | 3,214 |
Provision for credit loss expense | — |  |  | — |  |  | — |
Net increase (decrease) in allowance on previously impaired securities | 246 |  |  | (246) |  |  | — |
Ending balance, March 31, 2024 | $ | 2,252 |  |  | $ | 962 |  |  | $ | 3,214 |
Schedule of Debt Securities, Held-to-maturity, Credit Quality Indicator | The following table summarizes bond ratings for the Company’s HTM portfolio, based upon amortized cost, issued by state and political subdivisions and other securities as of March 31, 2025:
| State and Political Subdivisions |  |
(In thousands) | Not Guaranteed or Pre-Refunded |  | Other Credit Enhancement or Insurance |  | Pre-Refunded |  | Total |  | Other Securities
Aaa/AAA | $ | 182,720 |  |  | $ | 300,211 |  |  | $ | — |  |  | $ | 482,931 |  |  | $ | — |
Aa/AA | 627,418 |  |  | 527,544 |  |  | — |  |  | 1,154,962 |  |  | — |
A | 38,657 |  |  | 160,694 |  |  | — |  |  | 199,351 |  |  | 103,536 |
Baa/BBB | — |  |  | 4,388 |  |  | — |  |  | 4,388 |  |  | 153,443 |
Not Rated | 15,444 |  |  | — |  |  | — |  |  | 15,444 |  |  | — |
Total | $ | 864,239 |  |  | $ | 992,837 |  |  | $ | — |  |  | $ | 1,857,076 |  |  | $ | 256,979 |
Schedule of Income Earned on Securities | Income earned on securities for the three months ended March 31, 2025 and 2024, is as follows:
|  |  | Three Months Ended March 31,
(In thousands) |  |  |  |  | 2025 |  | 2024
Taxable: |  |  |  |  |  |  |
Held-to-maturity |  |  |  |  | $ | 10,399 |  |  | $ | 11,003 |
Available-for-sale |  |  |  |  | 21,185 |  |  | 31,195 |
Non-taxable: |  |  |  |  |  |  |
Held-to-maturity |  |  |  |  | 10,051 |  |  | 10,100 |
Available-for-sale |  |  |  |  | 5,622 |  |  | 5,703 |
Total |  |  |  |  | $ | 47,257 |  |  | $ | 58,001 |
Schedule of Amortized Cost and Estimated Fair Value by Maturity of Securities | The amortized cost and estimated fair value by maturity of securities as of March 31, 2025 are shown in the following table. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. Accordingly, actual maturities may differ from contractual maturities.
| Held-to-Maturity |  | Available-for-Sale
(In thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
One year or less | $ | 1,940 |  |  | $ | 1,936 |  |  | $ | 4,510 |  |  | $ | 4,480 |
After one through five years | 88,294 |  |  | 83,044 |  |  | 107,184 |  |  | 106,936 |
After five through ten years | 381,912 |  |  | 337,841 |  |  | 193,731 |  |  | 182,383 |
After ten years | 2,098,454 |  |  | 1,569,609 |  |  | 1,014,687 |  |  | 816,920 |
Securities not due on a single maturity date | 1,048,170 |  |  | 937,195 |  |  | 1,508,611 |  |  | 1,380,913 |
Other securities (no maturity) | — |  |  | — |  |  | 217 |  |  | 217 |
Total | $ | 3,618,770 |  |  | $ | 2,929,625 |  |  | $ | 2,828,940 |  |  | $ | 2,491,849 |

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