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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020
Mortgage-backed securities
$25,980  $—  $25,980  $798  $(1) $26,777  
State and political subdivisions
24,872  (95) 24,777  1,125  (2) 25,900  
Other securities1,175  (212) 963  111  —  1,074  
Total HTM$52,027  $(307) $51,720  $2,034  $(3) $53,751  
(In thousands)Amortized CostAllowance
for Credit Losses		Net Carrying AmountGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
December 31, 2019
Mortgage-backed securities
$10,796  $—  $10,796  $71  $(59) $10,808  
State and political subdivisions
27,082  —  27,082  849  —  27,931  
Other securities3,049  —  3,049  67  —  3,116  
Total HTM$40,927  $—  $40,927  $987  $(59) $41,855  
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 LossesGross Unrealized
Gains		Gross Unrealized
(Losses)		Estimated Fair
Value
Available-for-sale
June 30, 2020
U.S. Government agencies$210,496  $—  $1,416  $(991) $210,921  
Mortgage-backed securities1,125,484  —  28,804  (202) 1,154,086  
State and political subdivisions1,015,625  (371) 39,510  (696) 1,054,068  
Other securities76,943  (238) 1,354  (238) 77,821  
Total AFS$2,428,548  $(609) $71,084  $(2,127) $2,496,896  
December 31, 2019
U.S. Treasury$449,729  $—  $112  $(112) $449,729  
U.S. Government agencies194,207  —  1,313  (1,271) 194,249  
Mortgage-backed securities1,738,584  —  8,510  (4,149) 1,742,945  
State and political subdivisions860,539  —  20,983  (998) 880,524  
Other securities20,092  —  822  (18) 20,896  
Total AFS$3,263,151  $—  $31,740  $(6,548) $3,288,343  
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 June 30, 2020, 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$3,209  $(3) $56,007  $(988) $59,216  $(991) 
Mortgage-backed securities47,380  (161) 4,266  (41) 51,646  (202) 
State and political subdivisions30,468  (324) 388  (1) 30,856  (325) 
Total AFS$81,057  $(488) $60,661  $(1,030) $141,718  $(1,518) 
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, 2020 on the Company’s HTM and AFS securities held.
(In thousands)State and Political SubdivisionsOther SecuritiesTotal
Three Months Ended June 30, 2020
Held-to-Maturity
Beginning balance, April 1, 2020$97  $312  $409  
Provision for credit loss expense
(2) (100) (102) 
Ending balance, June 30, 2020$95  $212  $307  
Available-for-sale
Beginning balance, April 1, 2020$95  $174  $269  
Credit losses on securities not previously recorded
370  160  530  
Net increase (decrease) in allowance on previously impaired securities
(94) (96) (190) 
Ending balance, June 30, 2020$371  $238  $609  
Six Months Ended June 30, 2020
Held-to-Maturity
Beginning balance, January 1, 2020$—  $—  $—  
Impact of ASU 2016-13 adoption
58  311  369  
Provision for credit loss expense
37  (99) (62) 
Ending balance, June 30, 2020$95  $212  $307  
Available-for-sale
Beginning balance, January 1, 2020$—  $—  $—  
Impact of ASU 2016-13 adoption
373  —  373  
Credit losses on securities not previously recorded
77  192  269  
Reduction due to sales(142) —  (142) 
Net increase (decrease) in allowance on previously impaired securities
63  46  109  
Ending balance, June 30, 2020$371  $238  $609  
Debt Securities, Held-to-maturity, Credit Quality Indicator
The following table summarizes bond ratings for the Company’s HTM portfolio issued by state and political subdivisions and other securities as of June 30, 2020:

State and Political Subdivisions
(In thousands)Not Guaranteed or Pre-RefundedOther Credit Enhancement or InsurancePre-RefundedTotalOther Securities
Aaa/AAA$2,112  $—  $—  $2,112  $—  
Aa/AA11,512  5,922  —  17,434  —  
A961  1,147  —  2,108  —  
Not Rated2,849  369  —  3,218  1,175  
Total$17,434  $7,438  $—  $24,872  $1,175  
Income Earned on Securities
Income earned on securities for the three and six months ended June 30, 2020 and 2019, is as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
(In thousands)2020201920202019
Taxable:  
Held-to-maturity$288  $289  $459  $727  
Available-for-sale7,086  10,777  19,667  22,297  
Non-taxable:
Held-to-maturity68  89  140  1,251  
Available-for-sale6,031  4,511  12,150  7,672  
Total$13,473  $15,666  $32,416  $31,947  
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$4,928  $4,962  $15,006  $15,077  
After one through five years15,201  15,793  35,995  36,348  
After five through ten years5,918  6,219  203,777  205,627  
After ten years—  —  1,047,772  1,084,495  
Securities not due on a single maturity date25,980  26,777  1,125,484  1,154,086  
Other securities (no maturity)—  —  514  1,263  
Total$52,027  $53,751  $2,428,548  $2,496,896