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Investment Securities (Tables) | 12 Months Ended
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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 Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair 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 Cost |  | Gross Unrealized/Unrecognized Holding Gains |  | Gross Unrealized/Unrecognized Holding Losses |  | Fair 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 Months |  |  | 12 Months or Longer |  |  | Total |  |
(In thousands) |  | Fair Value | Unrealized Losses |  | Fair Value | Unrealized Losses |  | Fair Value |  | Unrealized 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 Months |  |  | 12 Months or Longer |  |  | Total |  |
(In thousands) |  | Fair Value | Unrealized/Unrecognized Losses |  | Fair Value | Unrealized/Unrecognized Losses |  | Fair Value |  | Unrealized/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 Cost |  | Fair 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 years |  | 298,944 |  |  | 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, 2019 |  | December 31, 2018
FHLB stock |  | $ | 30,060 |  |  | $ | 43,388 |
FRB stock |  | 14,653 |  |  | 8,225 |
Equity investments carried at fair value |  | 1,993 |  |  | 1,649 |
Equity investments carried at modified cost (1) |  | 2,689 |  |  | 2,589 |
Equity investments carried at net asset value |  | 20,411 |  |  | 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.

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