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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2022
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   
September 30, 2022
U.S. Government agencies$447,400 $— $447,400 $— $(97,871)$349,529 
Mortgage-backed securities 1,214,882 — 1,214,882 1,069 (131,437)1,084,514 
State and political subdivisions
1,865,310 (107)1,865,203 60 (540,980)1,324,283 
Other securities260,868 (1,277)259,591 — (33,877)225,714 
Total HTM$3,788,460 $(1,384)$3,787,076 $1,129 $(804,165)$2,984,040 
December 31, 2021
U.S. Government agencies$232,609 $— $232,609 $— $(7,914)$224,695 
Mortgage-backed securities 70,342 — 70,342 232 (1,425)69,149 
State and political subdivisions
1,210,248 (1,197)1,209,051 6,166 (8,462)1,206,755 
Other securities17,301 (82)17,219 — (440)16,779 
Total HTM$1,530,500 $(1,279)$1,529,221 $6,398 $(18,241)$1,517,378 
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, 2022
U.S. Treasury$2,250 $— $— $(59)$2,191 
U.S. Government agencies195,369 — 145 (7,454)188,060 
Mortgage-backed securities2,959,882 — 5 (289,539)2,670,348 
State and political subdivisions1,054,356 — 244 (232,091)822,509 
Other securities272,274 — 1 (17,840)254,435 
Total AFS$4,484,131 $— $395 $(546,983)$3,937,543 
December 31, 2021
U.S. Treasury$300 $— $— $— $300 
U.S. Government agencies374,754 — 495 (10,608)364,641 
Mortgage-backed securities4,485,548 — 6,307 (43,239)4,448,616 
State and political subdivisions1,791,097 — 30,556 (1,995)1,819,658 
Other securities479,162 — 6,647 (5,479)480,330 
Total AFS$7,130,861 $— $44,005 $(61,321)$7,113,545 
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, 2022, 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$2,191 $(59)$— $— $2,191 $(59)
U.S. Government agencies116,968 (5,120)53,942 (2,334)170,910 (7,454)
Mortgage-backed securities1,115,220 (73,690)1,545,776 (215,849)2,660,996 (289,539)
State and political subdivisions536,510 (79,426)259,147 (152,665)795,657 (232,091)
Other securities212,701 (14,259)36,243 (3,581)248,944 (17,840)
Total AFS$1,983,590 $(172,554)$1,895,108 $(374,429)$3,878,698 $(546,983)
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, 2022 on the Company’s HTM securities portfolio.

(In thousands)State and Political SubdivisionsOther
Securities		Total
Three Months Ended September 30, 2022
Held-to-maturity
Beginning balance, July 1, 2022$103 $1,278 $1,381 
Provision for credit loss expense— — — 
Net increase (decrease) in allowance on previously impaired securities3 (3)— 
Recoveries1 2 3 
Ending balance, September 30, 2022$107 $1,277 $1,384 
Nine Months Ended September 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(1,180)1,180 — 
Recoveries90 15 105 
Ending balance, September 30, 2022$107 $1,277 $1,384 
Activity in the allowance for credit losses by investment security type for the three and nine months ended September 30, 2021 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, 2021
Held-to-maturity
Beginning balance, July 1, 2021$871 $261 $1,132 
Provision for credit loss expense325 (325)— 
Recoveries— 147 147 
Ending balance, September 30, 2021$1,196 $83 $1,279 
Nine Months Ended September 30, 2021
Held-to-maturity
Beginning balance, January 1, 2021$2,307 $608 $2,915 
Provision for credit loss expense(1,111)(72)(1,183)
Securities charged-off— (600)(600)
Recoveries— 147 147 
Ending balance, September 30, 2021$1,196 $83 $1,279 
Available-for-sale
Beginning balance, January 1, 2021$217 $95 $312 
Reduction due to sales— (11)(11)
Net decrease in allowance on previously impaired securities(217)(84)(301)
Ending balance, September 30, 2021$— $— $— 
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, 2022:

State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$187,185 $280,768 $— $467,953 $— 
Aa/AA671,239 502,057 — 1,173,296 — 
A45,493 157,441 — 202,934 172,861 
Baa/BBB— 5,937 — 5,937 53,500 
Not Rated8,321 6,869 — 15,190 34,507 
Total$912,238 $953,072 $— $1,865,310 $260,868 
Income Earned on Securities Income earned on securities for the three and nine months ended September 30, 2022 and 2021, is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In thousands)2022202120222021
Taxable:  
Held-to-maturity$10,679 $1,127 $23,169 $2,477 
Available-for-sale14,169 15,949 41,622 39,313 
Non-taxable:
Held-to-maturity10,181 4,853 26,371 9,887 
Available-for-sale5,925 8,788 21,352 27,741 
Total$40,954 $30,717 $112,514 $79,418 
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, 2022 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$4,519 $4,519 $3,165 $3,142 
After one through five years7,671 7,449 184,193 177,833 
After five through ten years327,461 284,166 268,732 248,862 
After ten years2,233,927 1,603,392 1,067,671 836,869 
Securities not due on a single maturity date1,214,882 1,084,514 2,959,882 2,670,348 
Other securities (no maturity)— — 488 489 
Total$3,788,460 $2,984,040 $4,484,131 $3,937,543