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Investment Securities | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Investments Securities | Investment Securities The amortized cost and fair value of investment securities are shown in the following table. Management performs a quarterly evaluation of investment securities for any other-than-temporary impairment. During 2015 and 2014, there were no investment securities deemed to be other-than-temporarily impaired. During 2013, Park recognized other-than-temporary impairment charges of $17,000, related to an equity investment in a financial institution. Investment securities at December 31, 2015 and December 31, 2014 were as follows:
(In thousands) |  | Amortized Cost |  | Gross Unrealized/Unrecognized Holding Gains |  | Gross Unrealized/Unrecognized Holding Losses |  | Estimated Fair Value
2015: |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 527,605 |  |  | $ | — |  |  | $ | 5,542 |  |  | $ | 522,063 |
U.S. Government sponsored entities’ asset-backed securities |  | 907,989 |  |  | 8,776 |  |  | 5,272 |  |  | 911,493 |
Other equity securities |  | 1,120 |  |  | 1,590 |  |  | — |  |  | 2,710 |
Total |  | $ | 1,436,714 |  |  | $ | 10,366 |  |  | $ | 10,814 |  |  | $ | 1,436,266 |
2015: |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 48,190 |  |  | $ | 734 |  |  | $ | — |  |  | $ | 48,924 |
U.S. Government sponsored entities’ asset-backed securities |  | 101,112 |  |  | 1,526 |  |  | 134 |  |  | 102,504 |
Total |  | $ | 149,302 |  |  | $ | 2,260 |  |  | $ | 134 |  |  | $ | 151,428 |
(In thousands) |  | Amortized Cost |  | Gross Unrealized/Unrecognized Holding Gains |  | Gross Unrealized/Unrecognized Holding Losses |  | Estimated Fair Value
2014: |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 546,886 |  |  | $ | 11 |  |  | $ | 8,833 |  |  | $ | 538,064 |
U.S. Government sponsored entities’ asset-backed securities |  | 751,974 |  |  | 13,421 |  |  | 4,242 |  |  | 761,153 |
Other equity securities |  | 1,120 |  |  | 1,578 |  |  | — |  |  | 2,698 |
Total |  | $ | 1,299,980 |  |  | $ | 15,010 |  |  | $ | 13,075 |  |  | $ | 1,301,915 |
2014: |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |
U.S. Government sponsored entities’ asset-backed securities |  | $ | 140,562 |  |  | $ | 3,088 |  |  | $ | 160 |  |  | $ | 143,490 |
Park’s U.S. Government sponsored entities' asset-backed securities consisted of 15-year mortgage-backed securities and collateralized mortgage obligations (CMOs). At December 31, 2015, the amortized cost of Park’s available-for-sale mortgage-backed securities was $569.0 million and there were no held-to-maturity mortgage-backed securities within Park's investment portfolio. At December 31, 2015, the amortized cost of Park's available-for-sale and held-to-maturity CMOs was $339.0 million and $101.1 million, respectively. The following table provides detail on investment securities with unrealized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2015 and December 31, 2014:
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
2015: |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 326,973 |  |  | $ | 2,117 |  |  | $ | 195,090 |  |  | $ | 3,425 |  |  | $ | 522,063 |  |  | $ | 5,542 |
U.S. Government sponsored entities' asset-backed securities |  | 384,169 |  |  | 2,776 |  |  | 114,543 |  |  | 2,496 |  |  | 498,712 |  |  | 5,272 |
Total |  | $ | 711,142 |  |  | $ | 4,893 |  |  | $ | 309,633 |  |  | $ | 5,921 |  |  | $ | 1,020,775 |  |  | $ | 10,814 |
2015: |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities’ asset-backed securities |  | $ | 5,656 |  |  | $ | 10 |  |  | $ | 7,792 |  |  | $ | 124 |  |  | $ | 13,448 |  |  | $ | 134 |
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
2014: |  |  |  |  |  |  |  |  |  |  |  |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  | $ | 119,913 |  |  | $ | 87 |  |  | $ | 388,140 |  |  | $ | 8,746 |  |  | $ | 508,053 |  |  | $ | 8,833 |
U.S. Government sponsored entities' asset-backed securities |  | 73,276 |  |  | 136 |  |  | 170,430 |  |  | 4,106 |  |  | 243,706 |  |  | 4,242 |
Total |  | $ | 193,189 |  |  | $ | 223 |  |  | $ | 558,570 |  |  | $ | 12,852 |  |  | $ | 751,759 |  |  | $ | 13,075 |
2014: |  |  |  |  |  |  |  |  |  |  |  |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government sponsored entities' asset-backed securities |  | $ | 8,032 |  |  | $ | 148 |  |  | $ | 2,714 |  |  | $ | 12 |  |  | $ | 10,746 |  |  | $ | 160 |
Management does not believe any individual unrealized loss as of December 31, 2015 or 2014 represented an other-than-temporary impairment. The unrealized losses on debt securities are primarily the result of interest rate changes. These conditions will not prohibit Park from receiving its contractual principal and interest payments on these debt securities. The fair value of these debt securities is expected to recover as payments are received on these securities and they approach maturity. 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 in net income in the period the other-than-temporary impairment is identified. Other investment securities (as shown on the Consolidated Balance Sheets) consist of stock investments in the FHLB and the FRB. These restricted stock investments are carried at their redemption value. Park owned $50.1 million of FHLB stock and $8.2 million of FRB stock at both December 31, 2015 and December 31, 2014, respectively. The amortized cost and estimated fair value of investments in debt securities at December 31, 2015, 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
Securities Available-for-Sale |  |  |  |  |  |
U.S. Treasury and other U.S. Government sponsored entities’ notes: |  |  |  |  |  |
Due one through five years |  | $ | 220,000 |  |  | $ | 219,135 |  |  | 1.29 | %
Due five through ten years |  | 307,605 |  |  | 302,928 |  |  | 2.40 | %
Total |  | $ | 527,605 |  |  | $ | 522,063 |  |  | 1.94 | %
U.S. Government sponsored entities’ asset-backed securities |  | $ | 907,989 |  |  | $ | 911,493 |  |  | 2.23 | %
Securities Held-to-Maturity |  |  |  |  |  |
Obligations of states and political subdivisions |  |  |  |  |  |
Due greater than ten years |  | $ | 48,190 |  |  | $ | 48,924 |  |  | 4.65 | %
Total |  | $ | 48,190 |  |  | $ | 48,924 |  |  | 4.65 | %
U.S. Government sponsored entities’ asset-backed securities |  | $ | 101,112 |  |  | $ | 102,504 |  |  | 3.42 | %
Approximately $527.6 million of Park’s securities shown in the above table as U.S. Treasury and other U.S. Government sponsored entities' notes are callable notes. These callable securities have a final maturity of 1 to 7 years. The remaining weighted average life of the investment portfolio is 4.8 years. Investment securities having an amortized cost of $1,072 million and $1,205 million at December 31, 2015 and 2014, 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. At December 31, 2015, $429 million was pledged for government and trust department deposits, $622 million was pledged to secure repurchase agreements and $21 million was pledged as collateral for FHLB advance borrowings. At December 31, 2014, $513 million was pledged for government and trust department deposits, $664 million was pledged to secure repurchase agreements and $28 million was pledged as collateral for FHLB advance borrowings. At December 31, 2015, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. During 2015, Park sold certain HFS investment securities with a book value of $3.1 million at a gain of $88,000. These securities had been paid down to 97.8% of the principal outstanding at acquisition. During 2014, Park sold investment securities with a book value of $187,000 at a gain of $22,000. Additionally, Park sold investment securities with a book value of $174.1 million at a loss of $1.2 million. During 2013, Park sold $75.0 million of securities at book value for no gain.

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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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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