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Investment Securities | 9 Months Ended
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Sep. 30, 2017
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 nine-month periods ended September 30, 2017 and 2016, there were no investment securities deemed to be other-than-temporarily impaired. Investment securities at September 30, 2017, were as follows:
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 |  | $ | 270,000 |  |  | $ | — |  |  | $ | 1,159 |  |  | $ | 268,841 |
U.S. Government sponsored entities' asset-backed securities |  | 892,784 |  |  | 6,329 |  |  | 5,408 |  |  | 893,705 |
Other equity securities |  | 1,109 |  |  | 2,907 |  |  | — |  |  | 4,016 |
Total |  | $ | 1,163,893 |  |  | $ | 9,236 |  |  | $ | 6,567 |  |  | $ | 1,166,562 |
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 |  | $ | 58,947 |  |  | $ | 1,003 |  |  | $ | 15 |  |  | $ | 59,935 |
Obligations of states and political subdivisions |  | 283,718 |  |  | 5,080 |  |  | $ | 1,623 |  |  | 287,175 |
Total |  | $ | 342,665 |  |  | $ | 6,083 |  |  | $ | 1,638 |  |  | $ | 347,110 |
Investment securities with unrealized/unrecognized losses at September 30, 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
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 24,967 |  |  | $ | 33 |  |  | $ | 243,874 |  |  | $ | 1,126 |  |  | $ | 268,841 |  |  | $ | 1,159 |
U.S. Government sponsored entities' asset-backed securities |  | 519,984 |  |  | 4,815 |  |  | $ | 63,505 |  |  | 593 |  |  | $ | 583,489 |  |  | 5,408 |
Total |  | $ | 544,951 |  |  | $ | 4,848 |  |  | $ | 307,379 |  |  | $ | 1,719 |  |  | $ | 852,330 |  |  | $ | 6,567 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | — |  |  | $ | — |  |  | $ | 7,423 |  |  | $ | 15 |  |  | $ | 7,423 |  |  | $ | 15 |
Obligations of states and political subdivisions |  | 97,120 |  |  | $ | 1,247 |  |  | 12,983 |  |  | 376 |  |  | $ | 110,103 |  |  | 1,623 |
Total |  | $ | 97,120 |  |  | $ | 1,247 |  |  | $ | 20,406 |  |  | $ | 391 |  |  | $ | 117,526 |  |  | $ | 1,638 |
Investment securities at December 31, 2016, were as follows:
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 |  | $ | 270,000 |  |  | $ | — |  |  | $ | 2,467 |  |  | $ | 267,533 |
U.S. Government sponsored entities' asset-backed securities |  | 991,642 |  |  | 5,372 |  |  | 9,842 |  |  | 987,172 |
Other equity securities |  | 1,119 |  |  | 2,315 |  |  | — |  |  | 3,434 |
Total |  | $ | 1,262,761 |  |  | $ | 7,687 |  |  | $ | 12,309 |  |  | $ | 1,258,139 |
Securities Held-to-Maturity (In thousands) |  | Amortized Cost |  | Gross Unrecognized Holding Gains |  | Gross Unrecognized Holding Losses |  | Estimated Fair Value
Obligations of states and political subdivision |  | $ | 188,622 |  |  | $ | 977 |  |  | $ | 5,148 |  |  | $ | 184,451 |
U.S. Government sponsored entities' asset-backed securities |  | 71,211 |  |  | 1,097 |  |  | 87 |  |  | 72,221 |
Total |  | $ | 259,833 |  |  | $ | 2,074 |  |  | $ | 5,235 |  |  | $ | 256,672 |
Investment securities with unrealized/unrecognized losses at December 31, 2016, 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
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 247,695 |  |  | $ | 2,305 |  |  | $ | 19,838 |  |  | $ | 162 |  |  | $ | 267,533 |  |  | $ | 2,467 |
U.S. Government sponsored entities' asset-backed securities |  | 612,321 |  |  | 9,473 |  |  | 27,325 |  |  | 369 |  |  | 639,646 |  |  | 9,842 |
Total |  | $ | 860,016 |  |  | $ | 11,778 |  |  | $ | 47,163 |  |  | $ | 531 |  |  | $ | 907,179 |  |  | $ | 12,309 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivision |  | $ | 134,909 |  |  | $ | 5,148 |  |  | $ | — |  |  | $ | — |  |  | $ | 134,909 |  |  | $ | 5,148 |
U.S. Government sponsored entities' asset-backed securities |  | — |  |  | — |  |  | 7,564 |  |  | 87 |  |  | 7,564 |  |  | 87 |
Total |  | $ | 134,909 |  |  | $ | 5,148 |  |  | $ | 7,564 |  |  | $ | 87 |  |  | $ | 142,473 |  |  | $ | 5,235 |
Management does not believe any of the unrealized/unrecognized losses at September 30, 2017 or December 31, 2016 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 September 30, 2017, 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
Obligations of U.S. Treasury and other U.S. Government sponsored entities' obligations: |  |  |  |  |  |  |  |
Due less than one year |  | $ | 75,000 |  |  | $ | 74,930 |  |  | 1.02 | %
Due one through five years |  | 195,000 |  |  | 193,911 |  |  | 1.25 | %
Total |  | $ | 270,000 |  |  | $ | 268,841 |  |  | 1.18 | %
U.S. Government sponsored entities' asset-backed securities |  | $ | 892,784 |  |  | $ | 893,705 |  |  | 2.09 | %
Securities Held-to-Maturity (In thousands) |  | Amortized cost |  | Fair value |  | Tax equivalent yield (1)
Obligations of state and political subdivisions: |  |  |  |  |  |
Due over ten years |  | $ | 283,718 |  |  | $ | 287,175 |  |  | 4.47 | %
Total (1) |  | $ | 283,718 |  |  | $ | 287,175 |  |  | 4.47 | %
U.S. Government sponsored entities' asset-backed securities |  | $ | 58,947 |  |  | $ | 59,935 |  |  | 3.20 | %
(1) The tax equivalent yield for obligations of state and political subdivisions includes the effects of a taxable equivalent adjustment using a 35% rate. The aggregate taxable equivalent adjustment was $2.7 million for the nine months ended September 30, 2017. All of Park’s securities shown in the table above as obligations of U.S. Treasury and other U.S. Government sponsored entities' obligations are callable notes. These callable notes have final maturities of 0.1 years to 2.7 years. Of the $268.8 million reported at September 30, 2017, none were expected to be called. The remaining average life of the entire investment portfolio is estimated to be 4.3 years. There were no sales of investment securities during the three-month or nine-month periods ended September 30, 2017 or 2016. Investment securities having an amortized cost of $933 million and $937 million at September 30, 2017 and December 31, 2016, 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 FHLB advance borrowings.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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