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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021
U.S. Government agencies$77,396 $— $77,396 $— $(3,757)$73,639 
Mortgage-backed securities
47,988 — 47,988 476 (1,099)47,365 
State and political subdivisions
485,158 (1,042)484,116 1,718 (9,188)476,646 
Other securities576 (576)— 44 — 44 
Total HTM$611,118 $(1,618)$609,500 $2,238 $(14,044)$597,694 
December 31, 2020
Mortgage-backed securities
$22,354 $— $22,354 $683 $— $23,037 
State and political subdivisions
312,416 (2,307)310,109 8,148 (30)318,227 
Other securities1,176 (608)568 93 — 661 
Total HTM$335,946 $(2,915)$333,031 $8,924 $(30)$341,925 
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, 2021
U.S. Treasury$600 $— $— $— $600 
U.S. Government agencies511,973 — 369 (24,663)487,679 
Mortgage-backed securities2,156,121 — 12,917 (35,952)2,133,086 
State and political subdivisions1,570,747 (64)25,916 (24,689)1,571,910 
Other securities342,611 (2,390)3,343 (8,491)335,073 
Total AFS$4,582,052 $(2,454)$42,545 $(93,795)$4,528,348 
December 31, 2020
U.S. Government agencies$477,693 $— $844 $(1,300)$477,237 
Mortgage-backed securities1,374,769 — 21,261 (1,094)1,394,936 
State and political subdivisions1,416,136 (217)55,111 (307)1,470,723 
Other securities128,445 (95)2,447 (95)130,702 
Total AFS$3,397,043 $(312)$79,663 $(2,796)$3,473,598 
Gross Unrealized Losses and Fair Value of Investments
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, 2021, 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. Government agencies$402,235 $(23,887)$49,123 $(776)$451,358 $(24,663)
Mortgage-backed securities1,622,032 (35,949)323 (3)1,622,355 (35,952)
State and political subdivisions299,613 (24,624)90 (1)299,703 (24,625)
Other securities49,421 (6,101)— — 49,421 (6,101)
Total AFS$2,373,301 $(90,561)$49,536 $(780)$2,422,837 $(91,341)
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, 2021 and 2020 on the Company’s HTM and AFS securities portfolios.

(In thousands)State and Political SubdivisionsOther SecuritiesTotal
Three Months Ended March 31, 2021
Held-to-Maturity
Beginning balance, January 1, 2021$2,307 $608 $2,915 
Provision for credit loss expense(1,265)568 (697)
Securities charged-off— (600)(600)
Ending balance, March 31, 2021$1,042 $576 $1,618 
Available-for-sale
Beginning balance, January 1, 2021$217 $95 $312 
Credit losses on securities not previously recorded61 2,237 2,298 
Reduction due to sales— (11)(11)
Net decrease in allowance on previously impaired securities(214)69 (145)
Ending balance, March 31, 2021$64 $2,390 $2,454 
Three Months Ended March 31, 2020
Held-to-Maturity
Beginning balance, January 1, 2020$— $— $— 
Impact of ASU 2016-13 adoption
58 311 369 
Provision for credit loss expense39 1 40 
Ending balance, March 31, 2020$97 $312 $409 
Available-for-sale
Beginning balance, January 1, 2020$— $— $— 
Impact of ASU 2016-13 adoption
373 — 373 
Credit losses on securities not previously recorded44 174 218 
Net decrease in allowance on previously impaired securities(322)— (322)
Ending balance, March 31, 2020$95 $174 $269 
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, 2021:
State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$49,354 $17,894 $— $67,248 $— 
Aa/AA176,578 74,570 — 251,148 — 
A19,516 6,445 — 25,961 — 
Not Rated95,729 45,072 — 140,801 576 
Total$341,177 $143,981 $— $485,158 $576 
Income Earned on Securities
Income earned on securities for the three months ended March 31, 2021 and 2020, is as follows:

Three Months Ended
March 31,
(In thousands)20212020
Taxable:  
Held-to-maturity$513 $171 
Available-for-sale9,607 12,581 
Non-taxable:
Held-to-maturity2,004 72 
Available-for-sale9,449 6,119 
Total$21,573 $18,943 
Amortized Cost and Estimated Fair Value by Maturity of Securities
The amortized cost and estimated fair value by maturity of securities 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$7,034 $7,117 $11,951 $12,000 
After one through five years8,931 9,317 28,425 28,755 
After five through ten years5,695 4,556 373,751 370,817 
After ten years541,470 529,339 2,010,880 1,982,767 
Securities not due on a single maturity date47,988 47,365 2,156,121 2,133,086 
Other securities (no maturity)— — 924 923 
Total$611,118 $597,694 $4,582,052 $4,528,348