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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Investment Securities | Investment securities at March 31, 2021 and December 31, 2020, were as follows:
Debt securities AFS (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
March 31, 2021: |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 278,676 |  |  | $ | 19,637 |  |  | $ | — |  |  | $ | 298,313 |
U.S. Government sponsored entities' asset-backed securities |  | 800,312 |  |  | 20,955 |  |  | 6,358 |  |  | 814,909 |
Corporate debt securities |  | 2,000 |  |  | 62 |  |  | — |  |  | 2,062 |
Total |  | $ | 1,080,988 |  |  | $ | 40,654 |  |  | $ | 6,358 |  |  | $ | 1,115,284 |
Debt securities AFS (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
December 31, 2020: |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 279,245 |  |  | $ | 25,973 |  |  | $ | — |  |  | $ | 305,218 |
U.S. Government sponsored entities' asset-backed securities |  | 726,589 |  |  | 26,248 |  |  | 728 |  |  | 752,109 |
Corporate debt securities |  | 2,000 |  |  | 14 |  |  | — |  |  | 2,014 |
Total |  | $ | 1,007,834 |  |  | $ | 52,235 |  |  | $ | 728 |  |  | $ | 1,059,341 |
Schedule Of Unrealized Loss On Securities | Investment securities in an unrealized loss position at March 31, 2021, were as follows:
|  | Unrealized loss position for less than 12 months |  | Unrealized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Debt securities AFS |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 220,681 |  |  | $ | 6,326 |  |  | $ | 4,255 |  |  | $ | 32 |  |  | $ | 224,936 |  |  | $ | 6,358 |
Total |  | $ | 220,681 |  |  | $ | 6,326 |  |  | $ | 4,255 |  |  | $ | 32 |  |  | $ | 224,936 |  |  | $ | 6,358 |
Investment securities in an unrealized loss position at December 31, 2020, were as follows:
|  | Unrealized loss position for less than 12 months |  | Unrealized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Debt securities AFS |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 86,393 |  |  | $ | 695 |  |  | $ | 4,727 |  |  | $ | 33 |  |  | $ | 91,120 |  |  | $ | 728 |
Total |  | $ | 86,393 |  |  | $ | 695 |  |  | $ | 4,727 |  |  | $ | 33 |  |  | $ | 91,120 |  |  | $ | 728 |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of investments in debt securities at March 31, 2021, 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 of principal repayments.
Debt securities AFS (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield (1)
U.S. Government sponsored entities' asset-backed securities |  | $ | 800,312 |  |  | $ | 814,909 |  |  | 1.92 | %
Corporate debt securities |  |  |  |  |  |
Due five through ten years |  | $ | 2,000 |  |  | $ | 2,062 |  |  | 4.00 | %
Obligations of state and political subdivisions: |  |  |  |  |  |
Due five through ten years |  | $ | 96,354 |  |  | $ | 103,192 |  |  | 3.75 | %
Due over ten years |  | 182,322 |  |  | 195,121 |  |  | 3.67 | %
Total (1) |  | $ | 278,676 |  |  | $ | 298,313 |  |  | 3.70 | %

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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