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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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   
March 31, 2023
U.S. Government agencies$451,052 $— $451,052 $— $(92,267)$358,785 
Mortgage-backed securities 1,201,418 — 1,201,418 27 (103,863)1,097,582 
State and political subdivisions
1,860,332 (362)1,859,970 189 (393,539)1,466,620 
Other securities254,569 (1,526)253,043 — (27,054)225,989 
Total HTM$3,767,371 $(1,888)$3,765,483 $216 $(616,723)$3,148,976 
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
March 31, 2023
U.S. Treasury$2,264 $— $— $(44)$2,220 
U.S. Government agencies188,141 — 73 (6,371)181,843 
Mortgage-backed securities2,664,735 — 37 (231,242)2,433,530 
State and political subdivisions1,060,198 — 272 (164,574)895,896 
Other securities271,093 (5,800)— (22,826)242,467 
Total AFS$4,186,431 $(5,800)$382 $(425,057)$3,755,956 
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 March 31, 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$2,220 $(44)$— $— $2,220 $(44)
U.S. Government agencies85,993 (2,409)80,154 (3,962)166,147 (6,371)
Mortgage-backed securities442,923 (7,396)1,980,733 (223,846)2,423,656 (231,242)
State and political subdivisions47,760 (2,572)813,859 (162,002)861,619 (164,574)
Other securities83,075 (8,499)146,131 (8,527)229,206 (17,026)
Total AFS$661,971 $(20,920)$3,020,877 $(398,337)$3,682,848 $(419,257)
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, 2023 on the Company’s HTM and AFS securities portfolios.

(In thousands)State and Political SubdivisionsOther
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 expense252 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 

Activity in the allowance for credit losses by investment security type for the three months ended March 31, 2022 on the Company’s HTM securities portfolio was as follows:
(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended March 31, 2022
Held-to-maturity
Beginning balance, January 1, 2022$1,197 $82 $1,279 
Provision for credit loss expense— — — 
Recoveries88 10 98 
Ending balance, March 31, 2022$1,285 $92 $1,377 
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, 2023:

State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$183,761 $287,490 $— $471,251 $— 
Aa/AA633,064 525,076 — 1,158,140 — 
A47,706 171,293 — 218,999 101,586 
Baa/BBB— 3,387 — 3,387 152,983 
Not Rated8,555 — — 8,555 — 
Total$873,086 $987,246 $— $1,860,332 $254,569 
Income Earned on Securities
Income earned on securities for the three months ended March 31, 2023 and 2022, is as follows:

Three Months Ended
March 31,
(In thousands)20232022
Taxable:
Held-to-maturity$11,013 $1,912 
Available-for-sale21,791 16,236 
Non-taxable:
Held-to-maturity10,126 6,102 
Available-for-sale5,844 9,462 
Total$48,774 $33,712 
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, 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$2,413 $2,413 $12,552 $12,376 
After one through five years6,455 6,332 184,643 178,272 
After five through ten years359,813 321,295 256,336 233,547 
After ten years2,197,272 1,721,354 1,067,885 897,951 
Securities not due on a single maturity date1,201,418 1,097,582 2,664,735 2,433,530 
Other securities (no maturity)— — 280 280 
Total$3,767,371 $3,148,976 $4,186,431 $3,755,956