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Investments (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments [Abstract] |
Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities | The amortized cost and estimated fair values of the Company's securities are shown in the following table (in thousands):
| March 31, 2017 | December 31, 2016
Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Securities available-for-sale: |  |  |  |  |  |  |  |
U.S. Treasuries and U.S. |  |  |  |  |  |  |  |
government agencies | $ | 3 |  | $ | — |  | $ | — |  | $ | 3 |  | $ | 3 |  | $ | — |  | $ | — |  | $ | 3 |
Obligations of states and |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions | 95,440 |  | 983 |  | 1,223 |  | 95,200 |  | 83,248 |  | 594 |  | 1,474 |  | 82,368 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies | 343,681 |  | 1,548 |  | 6,075 |  | 339,154 |  | 335,867 |  | 1,507 |  | 6,560 |  | 330,814 |
Private label | 877 |  | 2 |  | — |  | 879 |  | 941 |  | 1 |  | — |  | 942 |
Trust preferred securities | 4,755 |  | 133 |  | 201 |  | 4,687 |  | 6,052 |  | 1,164 |  | 554 |  | 6,662 |
Corporate securities | 23,923 |  | 361 |  | 196 |  | 24,088 |  | 23,925 |  | 127 |  | 478 |  | 23,574 |
Total Debt Securities | 468,679 |  | 3,027 |  | 7,695 |  | 464,011 |  | 450,036 |  | 3,393 |  | 9,066 |  | 444,363 |
Marketable equity securities | 2,136 |  | 2,462 |  | — |  | 4,598 |  | 2,136 |  | 2,095 |  | — |  | 4,231 |
Investment funds | 1,525 |  | — |  | 36 |  | 1,489 |  | 1,525 |  | — |  | 36 |  | 1,489 |
Total Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale | $ | 472,340 |  | $ | 5,489 |  | $ | 7,731 |  | $ | 470,098 |  | $ | 453,697 |  | $ | 5,488 |  | $ | 9,102 |  | $ | 450,083 |
Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities |
| March 31, 2017 | December 31, 2016
Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Securities held-to-maturity: |  |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | $ | 68,308 |  | $ | 1,392 |  | $ | 44 |  | $ | 69,656 |  | $ | 71,169 |  | $ | 1,346 |  | $ | 70 |  | $ | 72,445 |
Trust preferred securities | 4,000 |  | — |  | — |  | 4,000 |  | 4,000 |  | — |  | — |  | 4,000 |
Total Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-Maturity | $ | 72,308 |  | $ | 1,392 |  | $ | 44 |  | $ | 73,656 |  | $ | 75,169 |  | $ | 1,346 |  | $ | 70 |  | $ | 76,445 |
Other investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-marketable equity securities | $ | 10,240 |  | $ | — |  | $ | — |  | $ | 10,240 |  | $ | 14,352 |  | $ | — |  | $ | — |  | $ | 14,352 |
Total Other Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities | $ | 10,240 |  | $ | — |  | $ | — |  | $ | 10,240 |  | $ | 14,352 |  | $ | — |  | $ | — |  | $ | 14,352 |
Gross Unrealized Losses And Fair Value Of Investments | The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| March 31, 2017
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 41,257 |  | $ | 1,223 |  | $ | — |  | $ | — |  | $ | 41,257 |  | $ | 1,223 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. Government agencies | 216,707 |  | 5,611 |  | 8,136 |  | 464 |  | 224,843 |  | 6,075 |
Trust preferred securities | — |  | — |  | 4,319 |  | 201 |  | 4,319 |  | 201 |
Corporate securities | 2,328 |  | 51 |  | 2,265 |  | 145 |  | 4,593 |  | 196 |
Investment funds | 1,500 |  | 36 |  | — |  | — |  | 1,500 |  | 36 |
Total | $ | 261,792 |  | $ | 6,921 |  | $ | 14,720 |  | $ | 810 |  | $ | 276,512 |  | $ | 7,731 |
| December 31, 2016
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 35,108 |  | $ | 1,474 |  | $ | — |  | $ | — |  | $ | 35,108 |  | $ | 1,474 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. Government agencies | 225,530 |  | 6,099 |  | 8,527 |  | 461 |  | 234,057 |  | 6,560 |
Trust preferred securities | — |  | — |  | 4,971 |  | 554 |  | 4,971 |  | 554 |
Corporate securities | 14,306 |  | 478 |  | — |  | — |  | 14,306 |  | 478 |
Investment funds | 1,500 |  | 36 |  | — |  | — |  | 1,500 |  | 36 |
Total | $ | 276,444 |  | $ | 8,087 |  | $ | 13,498 |  | $ | 1,015 |  | $ | 289,942 |  | $ | 9,102 |
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of debt securities at March 31, 2017, by contractual maturity, are shown in the following table (in thousands). Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties. Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
| Amortized Cost | Estimated Fair Value
Securities Available-for-Sale |  |
Due in one year or less | $ | 2,770 |  | $ | 2,788 |
Due after one year through five years | 15,041 |  | 15,225 |
Due after five years through ten years | 81,726 |  | 80,029 |
Due after ten years | 369,142 |  | 365,969 |
| $ | 468,679 |  | $ | 464,011 |
Securities Held-to-Maturity |  |  |  |
Due in one year or less | $ | — |  | $ | — |
Due after one year through five years | — |  | — |
Due after five years through ten years | — |  | — |
Due after ten years | 72,308 |  | 73,656 |
| $ | 72,308 |  | $ | 73,656 |
Gross Gains And Losses Realized | Gross gains and gross losses realized by the Company from investment security transactions are summarized in the table below (in thousands).
| Three months ended March 31, 2017
| 2017 | 2016
Gross realized gains | $ | 4,276 |  | $ | — |
Gross realized losses | — |  | — |
Net investment security gains | $ | 4,276 |  | $ | — |

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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://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=73527792&loc=d3e27290-111563 + Details
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