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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
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 CostAllowance
for Credit Losses		Net Carrying AmountGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Held-to-maturity   
December 31, 2024
U.S. Government agencies$455,869 $— $455,869 $— $(95,961)$359,908 
Mortgage-backed securities1,070,032 — 1,070,032 212 (133,746)936,498 
State and political subdivisions1,857,373 (196)1,857,177 20 (436,061)1,421,136 
Other securities256,576 (3,018)253,558 — (21,149)232,409 
Total HTM$3,639,850 $(3,214)$3,636,636 $232 $(686,917)$2,949,951 
December 31, 2023
U.S. Government agencies$453,121 $— $453,121 $— $(89,203)$363,918 
Mortgage-backed securities1,161,694 — 1,161,694 354 (107,834)1,054,214 
State and political subdivisions1,858,680 (2,006)1,856,674 284 (369,509)1,487,449 
Other securities256,007 (1,208)254,799 — (25,010)229,789 
Total HTM$3,729,502 $(3,214)$3,726,288 $638 $(591,556)$3,135,370 
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 LossesGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Available-for-sale
December 31, 2024
U.S. Treasury$999 $— $— $(3)$996 
U.S. Government agencies55,589 — 5 (1,047)54,547 
Mortgage-backed securities1,545,539 — 4 (152,784)1,392,759 
State and political subdivisions1,015,619 — 132 (157,569)858,182 
Other securities235,028 — 166 (12,252)222,942 
Total AFS$2,852,774 $— $307 $(323,655)$2,529,426 
December 31, 2023
U.S. Treasury$2,285 $— $— $(31)$2,254 
U.S. Government agencies74,460 — 35 (1,993)72,502 
Mortgage-backed securities2,138,652 — 8 (198,353)1,940,307 
State and political subdivisions1,035,147 — 187 (132,541)902,793 
Other securities259,165 — — (24,868)234,297 
Total AFS$3,509,709 $— $230 $(357,786)$3,152,153 
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
The following tables summarize the Company’s AFS investments in an unrealized loss position for which an allowance for credit loss has not been recorded as of the years ended December 31, 2024 and 2023, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:

 Less Than 12 Months12 Months or MoreTotal
(In thousands)Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale      
December 31, 2024
U.S. Treasury$— $— $996 $(3)$996 $(3)
U.S. Government agencies717 (7)51,186 (1,040)51,903 (1,047)
Mortgage-backed securities7,480 (189)1,384,532 (152,595)1,392,012 (152,784)
State and political subdivisions16,843 (195)829,754 (157,374)846,597 (157,569)
Other securities12,912 (20)162,803 (12,232)175,715 (12,252)
Total AFS$37,952 $(411)$2,429,271 $(323,244)$2,467,223 $(323,655)
December 31, 2023
U.S. Treasury$— $— $2,254 $(31)$2,254 $(31)
U.S. Government agencies8,614 (39)59,732 (1,954)68,346 (1,993)
Mortgage-backed securities9,182 (135)1,930,105 (198,218)1,939,287 (198,353)
State and political subdivisions3,050 (163)869,379 (132,378)872,429 (132,541)
Other securities11,016 (2,654)223,025 (22,214)234,041 (24,868)
Total AFS$31,862 $(2,991)$3,084,495 $(354,795)$3,116,357 $(357,786)
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 years ended December 31, 2024 and 2023 on the Company’s HTM and AFS securities held.

(In thousands)State and Political SubdivisionsOther SecuritiesTotal
December 31, 2024
Held-to-maturity
Beginning balance, January 1, 2024$2,006 $1,208 $3,214 
Provision for credit loss expense— — — 
Net (decrease) increase in allowance on previously impaired securities(1,810)1,810 — 
Ending balance, December 31, 2024$196 $3,018 $3,214 
December 31, 2023
Held-to-maturity
Beginning balance, January 1, 2023$110 $1,278 $1,388 
Provision for credit loss expense824 1,002 1,826 
Net increase (decrease) in allowance on previously impaired securities1,072 (1,072)— 
Ending balance, December 31, 2023$2,006 $1,208 $3,214 
Available-for-sale
Beginning balance, January 1, 2023$— $— $— 
Provision for credit loss expense— 12,800 12,800 
Reduction due to sales— (2,078)(2,078)
Securities charged-off— (7,000)(7,000)
Net decrease in allowance on previously impaired securities— (3,722)(3,722)
Ending balance, December 31, 2023$— $— $— 
Schedule of Debt Securities, Held-to-maturity, Credit Quality Indicator
The following table summarizes bond ratings for the Company’s HTM portfolio issued by state and political subdivisions and other securities as of December 31, 2024:
State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$182,920 $300,196 $— $483,116 $— 
Aa/AA627,680 526,027 — 1,153,707 — 
A38,673 161,904 — 200,577 108,527 
Baa/BBB— 4,386 — 4,386 148,049 
Not Rated15,587 — — 15,587 — 
Total$864,860 $992,513 $— $1,857,373 $256,576 
Schedule of Income Earned on Securities
Income earned on securities for the years ended December 31, 2024, 2023 and 2022, is as follows: 
(In thousands)202420232022
Taxable:   
Held-to-maturity$42,848 $44,093 $33,778 
Available-for-sale110,565 99,085 60,659 
Non-taxable:
Held-to-maturity40,371 40,612 36,516 
Available-for-sale22,649 23,128 27,250 
Total$216,433 $206,918 $158,203 
Schedule of Amortized Cost and Estimated Fair Value by Maturity of Securities
The amortized cost and estimated fair value by maturity of securities are shown in the following table as of December 31, 2024. 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-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
One year or less$1,906 $1,904 $4,170 $4,148 
After one through five years58,191 54,579 106,939 106,602 
After five through ten years393,485 345,000 194,665 181,393 
After ten years2,116,236 1,611,970 1,001,235 844,298 
Securities not due on a single maturity date1,070,032 936,498 1,545,539 1,392,759 
Other securities (no maturity)— — 226 226 
Total$3,639,850 $2,949,951 $2,852,774 $2,529,426