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Investment Securities | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The amortized cost and fair value of investment securities are shown in the following tables. Management performs a quarterly evaluation of investment securities for any other-than-temporary impairment. For the three-month and six-month periods ended June 30, 2018 and 2017, there were no investment securities deemed to be other-than-temporarily impaired. Investment securities at June 30, 2018, were as follows:
Debt Securities Available-for-Sale (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
U.S. Government sponsored entities' asset-backed securities |  | 1,127,511 |  |  | 476 |  |  | 36,309 |  |  | 1,091,678 |
Total |  | $ | 1,127,511 |  |  | $ | 476 |  |  | $ | 36,309 |  |  | $ | 1,091,678 |
Debt Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrecognized Holding Gains |  | Gross Unrecognized Holding Losses |  | Estimated Fair Value
U.S. Government sponsored entities' asset-backed securities |  | $ | 47,192 |  |  | $ | 95 |  |  | $ | 1,236 |  |  | $ | 46,051 |
Obligations of states and political subdivisions |  | 304,239 |  |  | 2,225 |  |  | $ | 4,323 |  |  | 302,141 |
Total |  | $ | 351,431 |  |  | $ | 2,320 |  |  | $ | 5,559 |  |  | $ | 348,192 |
Investment securities with unrealized/unrecognized losses at June 30, 2018, were as follows:
|  | Unrealized/unrecognized loss position for less than 12 months |  | Unrealized/unrecognized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | 775,132 |  |  | 19,613 |  |  | $ | 279,486 |  |  | 16,696 |  |  | $ | 1,054,618 |  |  | 36,309 |
Total |  | $ | 775,132 |  |  | $ | 19,613 |  |  | $ | 279,486 |  |  | $ | 16,696 |  |  | $ | 1,054,618 |  |  | $ | 36,309 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 40,016 |  |  | $ | 1,236 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,016 |  |  | $ | 1,236 |
Obligations of states and political subdivisions |  | 129,738 |  |  | $ | 2,237 |  |  | 58,541 |  |  | 2,086 |  |  | $ | 188,279 |  |  | 4,323 |
Total |  | $ | 169,754 |  |  | $ | 3,473 |  |  | $ | 58,541 |  |  | $ | 2,086 |  |  | $ | 228,295 |  |  | $ | 5,559 |
Investment securities at December 31, 2017, were as follows:
Debt Securities Available-for-Sale (In thousands) |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Estimated Fair Value
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 |
Debt Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrecognized Holding Gains |  | Gross Unrecognized Holding Losses |  | Estimated Fair Value
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 |
Investment securities with unrealized/unrecognized losses at December 31, 2017, were as follows:
|  | Unrealized/unrecognized loss position for less than 12 months |  | Unrealized/unrecognized loss position for 12 months or longer |  | Total
(In thousands) |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses |  | Fair value |  | Unrealized/unrecognized losses
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 |
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 |
Management does not believe any of the unrealized/unrecognized losses at June 30, 2018 or December 31, 2017 represented other-than-temporary impairment. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized within net income in the period the other-than-temporary impairment is identified. Park’s U.S. Government sponsored entities' asset-backed securities consist of 15-year residential mortgage-backed securities and collateralized mortgage obligations. The amortized cost and estimated fair value of investments in debt securities at June 30, 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 of principal repayments.
Securities Available-for-Sale (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield
U.S. Government sponsored entities' asset-backed securities |  | $ | 1,127,511 |  |  | $ | 1,091,678 |  |  | 2.35 | %
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield (1)
Obligations of state and political subdivisions: |  |  |  |  |  |
Due five through ten years |  | $ | 2,438 |  |  | $ | 2,395 |  |  | 2.97 | %
Due over ten years |  | $ | 301,801 |  |  | $ | 299,746 |  |  | 3.68 | %
Total (1) |  | $ | 304,239 |  |  | $ | 302,141 |  |  | 3.67 | %
U.S. Government sponsored entities' asset-backed securities |  | $ | 47,192 |  |  | $ | 46,051 |  |  | 2.83 | %
(1) The tax equivalent yield for obligations of state and political subdivisions includes the effects of a taxable equivalent adjustment using a 21% federal corporate income tax rate. The remaining average life of the entire investment portfolio is estimated to be 4.9 years. There were no sales of investment securities during the three-month period ended June 30, 2018. During the six-month period ended June 30, 2018, Park sold certain AFS debt securities with a book value of $247.0 million at a loss of $2.6 million. Additionally, during the six-month period ended June 30, 2018, Park sold certain HTM debt securities with a book value of $7.4 million at a gain of $291,000. These HTM securities had been paid down by 96.3% of the principal outstanding at acquisition. There were no sales of investment securities during the three-month or six-month periods ended June 30, 2017. Investment securities having an amortized cost of $618 million and $557 million at June 30, 2018 and December 31, 2017, respectively, were pledged to collateralize government and trust department deposits in accordance with federal and state requirements, to secure repurchase agreements sold and as collateral for Federal Home Loan Bank ("FHLB") advance borrowings.

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