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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
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, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | $ | 453,805 |  |  | $ | — |  |  | $ | 453,805 |  |  | $ | — |  |  | $ | (94,887) |  |  | $ | 358,918 |
Mortgage-backed securities | 1,142,352 |  |  | — |  |  | 1,142,352 |  |  | 238 |  |  | (126,553) |  |  | 1,016,037 |
State and political subdivisions | 1,857,894 |  |  | (2,252) |  |  | 1,855,642 |  |  | 86 |  |  | (410,749) |  |  | 1,444,979 |
Other securities | 256,421 |  |  | (962) |  |  | 255,459 |  |  | — |  |  | (26,111) |  |  | 229,348 |
Total HTM | $ | 3,710,472 |  |  | $ | (3,214) |  |  | $ | 3,707,258 |  |  | $ | 324 |  |  | $ | (658,300) |  |  | $ | 3,049,282 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | $ | 453,121 |  |  | $ | — |  |  | $ | 453,121 |  |  | $ | — |  |  | $ | (89,203) |  |  | $ | 363,918 |
Mortgage-backed securities | 1,161,694 |  |  | — |  |  | 1,161,694 |  |  | 354 |  |  | (107,834) |  |  | 1,054,214 |
State and political subdivisions | 1,858,680 |  |  | (2,006) |  |  | 1,856,674 |  |  | 284 |  |  | (369,509) |  |  | 1,487,449 |
Other securities | 256,007 |  |  | (1,208) |  |  | 254,799 |  |  | — |  |  | (25,010) |  |  | 229,789 |
Total HTM | $ | 3,729,502 |  |  | $ | (3,214) |  |  | $ | 3,726,288 |  |  | $ | 638 |  |  | $ | (591,556) |  |  | $ | 3,135,370 |
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, 2024 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,990 |  |  | $ | — |  |  | $ | — |  |  | $ | (26) |  |  | $ | 1,964 |
U.S. Government agencies | 71,768 |  |  | — |  |  | 28 |  |  | (1,995) |  |  | 69,801 |
Mortgage-backed securities | 2,048,895 |  |  | — |  |  | 3 |  |  | (203,534) |  |  | 1,845,364 |
State and political subdivisions | 1,013,190 |  |  | — |  |  | 142 |  |  | (138,483) |  |  | 874,849 |
Other securities | 259,128 |  |  | — |  |  | 59 |  |  | (23,607) |  |  | 235,580 |
Total AFS | $ | 3,394,971 |  |  | $ | — |  |  | $ | 232 |  |  | $ | (367,645) |  |  | $ | 3,027,558 |
December 31, 2023 |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 2,285 |  |  | $ | — |  |  | $ | — |  |  | $ | (31) |  |  | $ | 2,254 |
U.S. Government agencies | 74,460 |  |  | — |  |  | 35 |  |  | (1,993) |  |  | 72,502 |
Mortgage-backed securities | 2,138,652 |  |  | — |  |  | 8 |  |  | (198,353) |  |  | 1,940,307 |
State and political subdivisions | 1,035,147 |  |  | — |  |  | 187 |  |  | (132,541) |  |  | 902,793 |
Other securities | 259,165 |  |  | — |  |  | — |  |  | (24,868) |  |  | 234,297 |
Total AFS | $ | 3,509,709 |  |  | $ | — |  |  | $ | 230 |  |  | $ | (357,786) |  |  | $ | 3,152,153 |
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, 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 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,964 |  |  | $ | (26) |  |  | $ | — |  |  | $ | — |  |  | $ | 1,964 |  |  | $ | (26) |
U.S. Government agencies | 15,965 |  |  | (181) |  |  | 49,809 |  |  | (1,814) |  |  | 65,774 |  |  | (1,995) |
Mortgage-backed securities | 10,842 |  |  | (293) |  |  | 1,833,560 |  |  | (203,241) |  |  | 1,844,402 |  |  | (203,534) |
State and political subdivisions | 14,262 |  |  | (79) |  |  | 845,801 |  |  | (138,404) |  |  | 860,063 |  |  | (138,483) |
Other securities | — |  |  | — |  |  | 201,410 |  |  | (23,607) |  |  | 201,410 |  |  | (23,607) |
Total AFS | $ | 43,033 |  |  | $ | (579) |  |  | $ | 2,930,580 |  |  | $ | (367,066) |  |  | $ | 2,973,613 |  |  | $ | (367,645) |
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, 2024 on the Company’s HTM securities portfolio.
(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 |
Activity in the allowance for credit losses by investment security type for the three months ended March 31, 2023 on the Company’s HTM and AFS securities portfolio was as follows:
(In thousands) | State and Political Subdivisions |  | Other Securities |  | Total
Three Months Ended March 31, 2023 |  |  |  |  |
Held-to-maturity |  |  |  |  |
Beginning balance, January 1, 2023 | $ | 110 |  |  | $ | 1,278 |  |  | $ | 1,388 |
Provision for credit loss expense | 252 |  |  | 248 |  |  | 500 |
Ending balance, March 31, 2023 | $ | 362 |  |  | $ | 1,526 |  |  | $ | 1,888 |
Available-for-sale |  |  |  |  |
Beginning balance, January 1, 2023 | $ | — |  |  | $ | — |  |  | $ | — |
Provision for credit loss expense | — |  |  | 12,800 |  |  | 12,800 |
Securities charged-off | — |  |  | (7,000) |  |  | (7,000) |
Ending balance, March 31, 2023 | $ | — |  |  | $ | 5,800 |  |  | $ | 5,800 |
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, 2024:
| State and Political Subdivisions |  |
(In thousands) | Not Guaranteed or Pre-Refunded |  | Other Credit Enhancement or Insurance |  | Pre-Refunded |  | Total |  | Other Securities
Aaa/AAA | $ | 179,307 |  |  | $ | 299,940 |  |  | $ | — |  |  | $ | 479,247 |  |  | $ | — |
Aa/AA | 634,641 |  |  | 524,661 |  |  | — |  |  | 1,159,302 |  |  | — |
A | 37,050 |  |  | 161,368 |  |  | — |  |  | 198,418 |  |  | 102,604 |
Baa/BBB | — |  |  | 4,379 |  |  | — |  |  | 4,379 |  |  | 153,817 |
Not Rated | 16,548 |  |  | — |  |  | — |  |  | 16,548 |  |  | — |
Total | $ | 867,546 |  |  | $ | 990,348 |  |  | $ | — |  |  | $ | 1,857,894 |  |  | $ | 256,421 |
Income Earned on Securities | Income earned on securities for the three months ended March 31, 2024 and 2023, is as follows:
|  |  | Three Months Ended March 31,
(In thousands) |  |  |  |  | 2024 |  | 2023
Taxable: |  |  |  |  |  |  |
Held-to-maturity |  |  |  |  | $ | 11,003 |  |  | $ | 11,013 |
Available-for-sale |  |  |  |  | 31,195 |  |  | 21,791 |
Non-taxable: |  |  |  |  |  |  |
Held-to-maturity |  |  |  |  | 10,100 |  |  | 10,126 |
Available-for-sale |  |  |  |  | 5,703 |  |  | 5,844 |
Total |  |  |  |  | $ | 58,001 |  |  | $ | 48,774 |
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, 2024 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 | $ | 1,570 |  |  | $ | 1,516 |  |  | $ | 10,034 |  |  | $ | 9,778 |
After one through five years | 13,708 |  |  | 13,065 |  |  | 116,012 |  |  | 115,248 |
After five through ten years | 394,392 |  |  | 347,677 |  |  | 213,380 |  |  | 188,442 |
After ten years | 2,158,450 |  |  | 1,670,987 |  |  | 1,006,399 |  |  | 868,475 |
Securities not due on a single maturity date | 1,142,352 |  |  | 1,016,037 |  |  | 2,048,895 |  |  | 1,845,364 |
Other securities (no maturity) | — |  |  | — |  |  | 251 |  |  | 251 |
Total | $ | 3,710,472 |  |  | $ | 3,049,282 |  |  | $ | 3,394,971 |  |  | $ | 3,027,558 |

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