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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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   
September 30, 2024
U.S. Government agencies$455,179 $— $455,179 $— $(75,331)$379,848 
Mortgage-backed securities 1,093,070 — 1,093,070 571 (88,660)1,004,981 
State and political subdivisions
1,857,510 (227)1,857,283 176 (368,773)1,488,686 
Other securities256,155 (2,987)253,168 — (17,073)236,095 
Total HTM$3,661,914 $(3,214)$3,658,700 $747 $(549,837)$3,109,610 
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 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 Losses		Gross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Available-for-sale
September 30, 2024
U.S. Treasury$1,297 $— $— $(7)$1,290 
U.S. Government agencies59,247 — 23 (873)58,397 
Mortgage-backed securities1,634,391 — 18 (124,007)1,510,402 
State and political subdivisions1,042,823 — 180 (144,825)898,178 
Other securities239,053 — 159 (16,385)222,827 
Total AFS$2,976,811 $— $380 $(286,097)$2,691,094 
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 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, 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
U.S. Treasury$1,290 $(7)$— $— $1,290 $(7)
U.S. Government agencies982 (1)54,494 (872)55,476 (873)
Mortgage-backed securities1,574 (110)1,507,414 (123,897)1,508,988 (124,007)
State and political subdivisions4,934 (17)867,223 (144,808)872,157 (144,825)
Other securities7,870 (59)167,726 (16,326)175,596 (16,385)
Total AFS$16,650 $(194)$2,596,857 $(285,903)$2,613,507 $(286,097)
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, 2024 on the Company’s HTM securities portfolio.
(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 

Activity in the allowance for credit losses by investment security type for the three and nine months ended September 30, 2023 on the Company’s HTM and AFS securities portfolio was as follows:
(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended September 30, 2023
Held-to-maturity
Beginning balance, July 1, 2023$934 $2,280 $3,214 
Provision for credit loss expense— — — 
Net increase (decrease) in allowance on previously impaired securities586 (586)— 
Ending balance, September 30, 2023$1,520 $1,694 $3,214 
Available-for-sale
Beginning balance, July 1, 2023$— $2,396 $2,396 
Provision for credit loss expense— — — 
Net decrease in allowance on previously impaired securities— (1,200)(1,200)
Ending balance, September 30, 2023$— $1,196 $1,196 
(In thousands)State and Political SubdivisionsOther
Securities		Total
Nine Months Ended September 30, 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 securities586 (586)— 
Ending balance, September 30, 2023$1,520 $1,694 $3,214 
Available-for-sale
Beginning balance, January 1, 2023$— $— $— 
Provision for credit loss expense— 12,800 12,800 
Reduction due to sales— (2,078)(2,078)
Net decrease in allowance on previously impaired securities— (2,526)(2,526)
Securities charged-off— (7,000)(7,000)
Ending balance, September 30, 2023$— $1,196 $1,196 
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 September 30, 2024:

State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$182,907 $300,167 $— $483,074 $— 
Aa/AA629,590 525,905 — 1,155,495 — 
A37,021 161,726 — 198,747 98,760 
Baa/BBB— 4,384 — 4,384 157,395 
Not Rated15,810 — — 15,810 — 
Total$865,328 $992,182 $— $1,857,510 $256,155 
Schedule of Income Earned on Securities
Income earned on securities for the three and nine months ended September 30, 2024 and 2023, is as follows:

Three Months Ended
September 30,		Nine Months Ended
September 30,
(In thousands)2024202320242023
Taxable:  
Held-to-maturity$10,533 $11,062 $32,378 $33,133 
Available-for-sale26,940 23,672 86,576 67,150 
Non-taxable:
Held-to-maturity10,101 10,137 30,298 30,488 
Available-for-sale5,646 5,767 17,019 17,392 
Total$53,220 $50,638 $166,271 $148,163 
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 September 30, 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-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
One year or less$1,909 $1,906 $3,814 $3,791 
After one through five years42,277 40,576 108,132 107,789 
After five through ten years405,709 366,933 198,468 181,503 
After ten years2,118,949 1,695,214 1,031,775 887,378 
Securities not due on a single maturity date1,093,070 1,004,981 1,634,391 1,510,402 
Other securities (no maturity)— — 231 231 
Total$3,661,914 $3,109,610 $2,976,811 $2,691,094