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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of marketable securities
Investment securities at December 31, 2019 and December 31, 2018 were as follows:
 
(In thousands)Amortized CostGross Unrealized Holding GainsGross Unrealized Holding LossesFair Value
2019:
Debt Securities Available-for-Sale
Obligations of states and political subdivisions$302,928  $17,563  $—  $320,491  
U.S. Government sponsored entities’ asset-backed securities
884,571  10,862  6,223  889,210  
Total
$1,187,499  $28,425  $6,223  $1,209,701  
(In thousands)Amortized CostGross Unrealized/Unrecognized Holding GainsGross Unrealized/Unrecognized Holding LossesFair Value
2018:
Debt Securities Available-for-Sale
U.S. Government sponsored entities’ asset-backed securities
$1,028,883  $453  $25,915  $1,003,421  
Total
$1,028,883  $453  $25,915  $1,003,421  
2018:
Debt Securities Held-to-Maturity
Obligations of states and political subdivisions
$305,278  $3,202  $2,672  $305,808  
U.S. Government sponsored entities’ asset-backed securities
46,530  87  1,003  45,614  
Total
$351,808  $3,289  $3,675  $351,422  
Schedule of unrealized loss on investments
The following table provides detail on investment securities with unrealized/unrecognized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2019 and December 31, 2018:
 
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
2019:
Debt Securities Available-for-Sale
U.S. Government sponsored entities' asset-backed securities
$237,613  $1,106  $171,805  $5,117  $409,418  $6,223  
Total
$237,613  $1,106  $171,805  $5,117  $409,418  $6,223  
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized/Unrecognized LossesFair ValueUnrealized/Unrecognized LossesFair ValueUnrealized/Unrecognized Losses
2018:
Debt Securities Available-for-Sale
U.S. Government sponsored entities' asset-backed securities
$506,280  $5,998  $449,569  $19,917  $955,849  $25,915  
Total$506,280  $5,998  $449,569  $19,917  $955,849  $25,915  
2018:
Debt Securities Held-to-Maturity
Obligations of states and political subdivisions
$91,960  $1,095  $70,723  $1,577  $162,683  $2,672  
U.S. Government sponsored entities' asset-backed securities
32,656  838  6,931  165  39,587  1,003  
Total$124,616  $1,933  $77,654  $1,742  $202,270  $3,675  
Schedule of contractual maturity of debt securities
The amortized cost and estimated fair value of investments in debt securities at December 31, 2019, are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing in principal repayments.
 
(In thousands)Amortized CostFair Value
Tax Equivalent Yield (1)
Debt Securities Available-for-Sale
Obligations of states and political subdivisions
Due five through ten years$3,984  $4,135  3.04 %
Due greater than ten years298,944  316,356  3.69 %
Total$302,928  $320,491  3.68 %
U.S. Government sponsored entities’ asset-backed securities$884,571  $889,210  2.37 %
(1) The tax equivalent yield for obligations of states and political subdivisions includes the effects of a taxable equivalent adjustment using a 21% federal corporate income tax rate.
Cost and Equity Method Investments Disclosure [Text Block]
The carrying amount of other investment securities at December 31, 2019 and 2018 was as follows:

(In thousands)December 31, 2019December 31, 2018
FHLB stock$30,060  $43,388  
FRB stock14,653  8,225  
Equity investments carried at fair value1,993  1,649  
Equity investments carried at modified cost (1)
2,689  2,589  
Equity investments carried at net asset value20,411  17,065  
Total other investment securities$69,806  $72,916  
(1) There have been no impairments, downward adjustments, or upward adjustments made to equity investments carried at modified cost.