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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Cost and Equity Method Investments Disclosure [Text Block] | The carrying amount of other investment securities at December 31, 2018 and 2017 was as follows:
(In thousands) |  | December 31, 2018 |  | December 31, 2017
FHLB stock |  | $ | 43,388 |  |  | $ | 50,086 |
FRB stock |  | 8,225 |  |  | 8,225 |
Equity investments carried at fair value |  | 1,649 |  |  | 1,935 |
Equity investments carried at cost/modified cost (1) |  | 2,589 |  |  | 3,500 |
Total other investment securities |  | $ | 55,851 |  |  | $ | 63,746 |
Schedule of marketable securities | Investment securities at December 31, 2018 and December 31, 2017 were as follows:
(In thousands) |  | Amortized Cost |  | Gross Unrealized/Unrecognized Holding Gains |  | Gross Unrealized/Unrecognized Holding Losses |  | Estimated 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 |
(In thousands) |  | Amortized Cost |  | Gross Unrealized/Unrecognized Holding Gains |  | Gross Unrealized/Unrecognized Holding Losses |  | Estimated Fair Value
2017: |  |  |  |  |  |  |  |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 245,000 |  |  | $ | — |  |  | $ | 2,280 |  |  | $ | 242,720 |
U.S. Government sponsored entities’ asset-backed securities |  | 852,645 |  |  | 4,645 |  |  | 8,129 |  |  | 849,161 |
Total |  | $ | 1,097,645 |  |  | $ | 4,645 |  |  | $ | 10,409 |  |  | $ | 1,091,881 |
2017: |  |  |  |  |  |  |  |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 300,412 |  |  | $ | 6,575 |  |  | $ | 713 |  |  | $ | 306,274 |
U.S. Government sponsored entities’ asset-backed securities |  | 56,785 |  |  | 758 |  |  | 38 |  |  | 57,505 |
Total |  | $ | 357,197 |  |  | $ | 7,333 |  |  | $ | 751 |  |  | $ | 363,779 |
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, 2018 and December 31, 2017:
|  | 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 |
|  | 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
2017: |  |  |  |  |  |  |  |  |  |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 24,931 |  | $ | 70 |  |  | $ | 217,789 |  | $ | 2,210 |  |  | $ | 242,720 |  |  | $ | 2,280 |
U.S. Government sponsored entities' asset-backed securities |  | 236,924 |  | 2,786 |  |  | 318,797 |  | 5,343 |  |  | 555,721 |  |  | 8,129 |
Total |  | $ | 261,855 |  | $ | 2,856 |  |  | $ | 536,586 |  | $ | 7,553 |  |  | $ | 798,441 |  |  | $ | 10,409 |
2017: |  |  |  |  |  |  |  |  |  |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 26,644 |  | $ | 194 |  |  | $ | 45,498 |  | $ | 519 |  |  | $ | 72,142 |  |  | $ | 713 |
U.S. Government sponsored entities' asset-backed securities |  | 7,331 |  | 38 |  |  | — |  | — |  |  | 7,331 |  |  | 38 |
Total |  | $ | 33,975 |  | $ | 232 |  |  | $ | 45,498 |  | $ | 519 |  |  | $ | 79,473 |  |  | $ | 751 |
Schedule of contractual maturity of debt securities | The amortized cost and estimated fair value of investments in debt securities at December 31, 2018, 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 |  | Estimated Fair Value |  | Tax Equivalent Yield (1)
Debt Securities Available-for-Sale |  |  |  |  |  |
U.S. Government sponsored entities’ asset-backed securities |  | $ | 1,028,883 |  |  | $ | 1,003,421 |  |  | 2.35 | %
Debt Securities Held-to-Maturity |  |  |  |  |  |
Obligations of states and political subdivisions |  |  |  |  |  |
Due five through ten years |  | $ | 4,036 |  |  | $ | 3,987 |  |  | 3.04 | %
Due greater than ten years |  | 301,242 |  |  | 301,821 |  |  | 3.69 | %
Total |  | $ | 305,278 |  |  | $ | 305,808 |  |  | 3.68 | %
U.S. Government sponsored entities’ asset-backed securities |  | $ | 46,530 |  |  | $ | 45,614 |  |  | 2.83 | %

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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=82897076&loc=d3e27290-111563 + Details
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