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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2023
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 CostAllowance
for Credit Losses		Net Carrying AmountGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Held-to-maturity   
June 30, 2023
U.S. Government agencies$451,737 $— $451,737 $— $(94,515)$357,222 
Mortgage-backed securities 1,193,118 — 1,193,118 — (118,728)1,074,390 
State and political subdivisions
1,859,956 (934)1,859,022 67 (415,230)1,443,859 
Other securities255,157 (2,280)252,877 — (33,490)219,387 
Total HTM$3,759,968 $(3,214)$3,756,754 $67 $(661,963)$3,094,858 
December 31, 2022
U.S. Government agencies$448,012 $— $448,012 $— $(102,558)$345,454 
Mortgage-backed securities 1,190,781 — 1,190,781 227 (118,960)1,072,048 
State and political subdivisions
1,861,102 (110)1,860,992 56 (446,198)1,414,850 
Other securities261,199 (1,278)259,921 — (29,040)230,881 
Total HTM$3,761,094 $(1,388)$3,759,706 $283 $(696,756)$3,063,233 
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
June 30, 2023
U.S. Treasury$2,271 $— $— $(62)$2,209 
U.S. Government agencies183,735 — 51 (7,222)176,564 
Mortgage-backed securities2,532,234 — 4 (249,910)2,282,328 
State and political subdivisions1,029,164 — 184 (143,843)885,505 
Other securities264,861 (2,396)— (29,313)233,152 
Total AFS$4,012,265 $(2,396)$239 $(430,350)$3,579,758 
December 31, 2022
U.S. Treasury$2,257 $— $— $(60)$2,197 
U.S. Government agencies191,498 — 103 (7,322)184,279 
Mortgage-backed securities2,809,319 — 20 (266,437)2,542,902 
State and political subdivisions1,056,124 — 250 (185,300)871,074 
Other securities272,215 — — (19,813)252,402 
Total AFS$4,331,413 $— $373 $(478,932)$3,852,854 
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 June 30, 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
U.S. Treasury$776 $(21)$1,433 $(41)$2,209 $(62)
U.S. Government agencies22,246 (95)149,445 (7,127)171,691 (7,222)
Mortgage-backed securities2,707 (85)2,270,299 (249,825)2,273,006 (249,910)
State and political subdivisions17,045 (379)846,298 (143,464)863,343 (143,843)
Other securities48,806 (7,261)173,215 (19,656)222,021 (26,917)
Total AFS$91,580 $(7,841)$3,440,690 $(420,113)$3,532,270 $(427,954)
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 six months ended June 30, 2023 on the Company’s HTM and AFS securities portfolios.

(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended June 30, 2023
Held-to-maturity
Beginning balance, April 1, 2023$362 $1,526 $1,888 
Provision for credit loss expense572 754 1,326 
Ending balance, June 30, 2023$934 $2,280 $3,214 
Available-for-sale
Beginning balance, April 1, 2023$— $5,800 $5,800 
Provision for credit loss expense— — — 
Reduction due to sales— (2,078)(2,078)
Net increase (decrease) in allowance on previously impaired securities— (1,326)(1,326)
Securities charged-off— — — 
Ending balance, June 30, 2023$— $2,396 $2,396 
Six Months Ended June 30, 2023
Held-to-maturity
Beginning balance, January 1, 2023$110 $1,278 $1,388 
Provision for credit loss expense824 1,002 1,826 
Ending balance, June 30, 2023$934 $2,280 $3,214 
Available-for-sale
Beginning balance, January 1, 2023$— $— $— 
Provision for credit loss expense— 12,800 12,800 
Reduction due to sales— (2,078)(2,078)
Net increase (decrease) in allowance on previously impaired securities— (1,326)(1,326)
Securities charged-off— (7,000)(7,000)
Ending balance, June 30, 2023$— $2,396 $2,396 
Activity in the allowance for credit losses by investment security type for the three and six months ended June 30, 2022 on the Company’s HTM securities portfolio was as follows:

(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended June 30, 2022
Held-to-maturity
Beginning balance, April 1, 2022$1,285 $92 $1,377 
Provision for credit loss expense— — — 
Net increase (decrease) in allowance on previously impaired securities(1,183)1,183 — 
Recoveries1 3 4 
Ending balance, June 30, 2022$103 $1,278 $1,381 
Six Months Ended June 30, 2022
Held-to-maturity
Beginning balance, January 1, 2022$1,197 $82 $1,279 
Provision for credit loss expense— — — 
Net increase (decrease) in allowance on previously impaired securities(1,183)1,183 — 
Recoveries89 13 102 
Ending balance, June 30, 2022$103 $1,278 $1,381 
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 June 30, 2023:

State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$178,809 $299,834 $— $478,643 $— 
Aa/AA638,308 522,367 — 1,160,675 — 
A47,154 161,399 — 208,553 101,965 
Baa/BBB— 4,371 — 4,371 153,192 
Not Rated7,714 — — 7,714 — 
Total$871,985 $987,971 $— $1,859,956 $255,157 
Income Earned on Securities
Income earned on securities for the three and six months ended June 30, 2023 and 2022, is as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
(In thousands)2023202220232022
Taxable:  
Held-to-maturity$11,058 $10,578 $22,071 $12,490 
Available-for-sale21,687 11,217 43,478 27,453 
Non-taxable:
Held-to-maturity10,225 10,088 20,351 16,190 
Available-for-sale5,781 5,965 11,625 15,427 
Total$48,751 $37,848 $97,525 $71,560 
Amortized Cost and Estimated Fair Value by Maturity of Securities
The amortized cost and estimated fair value by maturity of securities as of June 30, 2023 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$1,915 $1,909 $64,701 $63,160 
After one through five years10,313 9,857 166,086 160,826 
After five through ten years363,981 315,452 218,164 187,975 
After ten years2,190,641 1,693,250 1,030,810 885,199 
Securities not due on a single maturity date1,193,118 1,074,390 2,532,234 2,282,328 
Other securities (no maturity)— — 270 270 
Total$3,759,968 $3,094,858 $4,012,265 $3,579,758