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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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 were classified as HTM as of December 31, 2024 are as follows: 
(In thousands)Amortized CostAllowance
for Credit Losses		Net Carrying AmountGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
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 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 
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
September 30, 2025
U.S. Government agencies$49,052 $— $2 $(699)$48,355 
Mortgage-backed securities2,446,711 — 5,032 (202,150)2,249,593 
State and political subdivisions1,045,691 — 47 (200,367)845,371 
Other securities182,520 — 170 (6,732)175,958 
Total AFS$3,723,974 $— $5,251 $(409,948)$3,319,277 
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 
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 September 30, 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 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
September 30, 2025
U.S. Government agencies$2,301 $(23)$44,694 $(676)$46,995 $(699)
Mortgage-backed securities3,255 (18)1,718,920 (202,132)1,722,175 (202,150)
State and political subdivisions5,755 (1,028)811,631 (199,339)817,386 (200,367)
Other securities— — 105,160 (6,732)105,160 (6,732)
Total AFS$11,311 $(1,069)$2,680,405 $(408,879)$2,691,716 $(409,948)
December 31, 2024
U.S. Treasury$— $— $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)
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 and nine months ended September 30, 2025 on the Company’s HTM securities portfolio.

(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended September 30, 2025
Held-to-maturity
Beginning balance, July 1, 2025$202 $3,012 $3,214 
Provision for credit loss expense(202)(3,012)(3,214)
Ending balance, September 30, 2025$— $— $— 
Nine Months Ended September 30, 2025
Held-to-maturity
Beginning balance, January 1, 2025$196 $3,018 $3,214 
Provision for credit loss expense(202)(3,012)(3,214)
Net increase (decrease) in allowance on previously impaired securities6 (6)— 
Ending balance, September 30, 2025$— $— $— 
Activity in the allowance for credit losses by investment security type for the three and nine months ended September 30, 2024 on the Company’s HTM securities portfolio was as follows:

(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended September 30, 2024
Held-to-maturity
Beginning balance, July 1, 2024$191 $3,023 $3,214 
Provision for credit loss expense— — — 
Net increase (decrease) in allowance on previously impaired securities36 (36)— 
Ending balance, September 30, 2024$227 $2,987 $3,214 
Nine Months Ended September 30, 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(1,779)1,779 — 
Ending balance, September 30, 2024$227 $2,987 $3,214 
Schedule of Income Earned on Securities
Income earned on securities for the three and nine months ended September 30, 2025 and 2024, is as follows:

Three Months Ended
September 30,		Nine Months Ended
September 30,
(In thousands)2025202420252024
Taxable:  
Held-to-maturity$2,370 $10,533 $22,993 $32,378 
Available-for-sale26,813 26,940 69,007 86,576 
Non-taxable:
Held-to-maturity1,945 10,101 22,048 30,298 
Available-for-sale6,336 5,646 17,571 17,019 
Total$37,464 $53,220 $131,619 $166,271 
Schedule of Amortized Cost and Estimated Fair Value by Maturity of Securities
The amortized cost and estimated fair value by maturity of AFS securities as of September 30, 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. 

 Available-for-Sale
(In thousands)Amortized
Cost		Fair
Value
One year or less$10,889 $10,792 
After one through five years104,625 104,255 
After five through ten years138,009 130,883 
After ten years1,023,532 823,546 
Securities not due on a single maturity date2,446,711 2,249,593 
Other securities (no maturity)208 208 
Total$3,723,974 $3,319,277