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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities |
| December 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 | $ | 2 |  | $ | — |  | $ | — |  | $ | 2 |  | $ | 3 |  | $ | — |  | $ | — |  | $ | 3 |
Obligations of states and |  |  |  |  |  |  |  |
political subdivisions | 94,552 |  | 2,051 |  | 407 |  | 96,196 |  | 83,248 |  | 594 |  | 1,474 |  | 82,368 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 425,559 |  | 1,093 |  | 7,305 |  | 419,347 |  | 335,867 |  | 1,507 |  | 6,560 |  | 330,814 |
Private label | 649 |  | 3 |  | — |  | 652 |  | 941 |  | 1 |  | — |  | 942 |
Trust preferred |  |  |  |  |  |  |  |
securities | 4,764 |  | 26 |  | 54 |  | 4,736 |  | 6,052 |  | 1,164 |  | 554 |  | 6,662 |
Corporate securities | 21,916 |  | 475 |  | 123 |  | 22,268 |  | 23,925 |  | 127 |  | 478 |  | 23,574 |
Total Debt Securities | 547,442 |  | 3,648 |  | 7,889 |  | 543,201 |  | 450,036 |  | 3,393 |  | 9,066 |  | 444,363 |
Marketable equity securities | 2,136 |  | 3,563 |  | — |  | 5,699 |  | 2,136 |  | 2,095 |  | — |  | 4,231 |
Investment funds | 1,525 |  | — |  | 36 |  | 1,489 |  | 1,525 |  | — |  | 36 |  | 1,489 |
Total Securities |  |  |  |  |  |  |  |
Available-for-Sale | $ | 551,103 |  | $ | 7,211 |  | $ | 7,925 |  | $ | 550,389 |  | $ | 453,697 |  | $ | 5,488 |  | $ | 9,102 |  | $ | 450,083 |
Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities |
| December 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: |  |  |  |  |  |  |  |
U.S. government agencies | $ | 60,449 |  | $ | 1,222 |  | $ | 25 |  | $ | 61,646 |  | $ | 71,169 |  | $ | 1,346 |  | $ | 70 |  | $ | 72,445 |
Trust preferred securities | 4,000 |  | — |  | — |  | 4,000 |  | 4,000 |  | — |  | — |  | 4,000 |
Total Securities |  |  |  |  |  |  |  |
Held-to-Maturity | $ | 64,449 |  | $ | 1,222 |  | $ | 25 |  | $ | 65,646 |  | $ | 75,169 |  | $ | 1,346 |  | $ | 70 |  | $ | 76,445 |
Other investment securities: |  |  |  |  |  |  |  |
Non-marketable equity securities | $ | 14,147 |  | $ | — |  | $ | — |  | $ | 14,147 |  | $ | 14,352 |  | $ | — |  | $ | — |  | $ | 14,352 |
Total Other Investment |  |  |  |  |  |  |  |
Securities | $ | 14,147 |  | $ | — |  | $ | — |  | $ | 14,147 |  | $ | 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):
| December 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 | $ | 4,913 |  | $ | 28 |  | $ | 19,440 |  | $ | 379 |  | $ | 24,353 |  | $ | 407 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 172,807 |  | 1,887 |  | 140,226 |  | 5,418 |  | 313,033 |  | 7,305 |
Trust preferred securities | 4,475 |  | 54 |  | — |  | — |  | 4,475 |  | 54 |
Corporate securities | 3,357 |  | 49 |  | 2,350 |  | 74 |  | 5,707 |  | 123 |
Investment funds | 1,500 |  | 36 |  | — |  | — |  | 1,500 |  | 36 |
Total | $ | 187,052 |  | $ | 2,054 |  | $ | 162,016 |  | $ | 5,871 |  | $ | 349,068 |  | $ | 7,925 |
| 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 December 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.
| Cost | Estimated Fair Value
Securities Available-for-Sale |  |
Due in one year or less | $ | 3,002 |  | $ | 3,005 |
Due after one year through five years | 15,824 |  | 15,854 |
Due after five years through ten years | 76,555 |  | 75,450 |
Due after ten years | 452,061 |  | 448,892 |
| $ | 547,442 |  | $ | 543,201 |
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 | 64,449 |  | 65,646 |
| $ | 64,449 |  | $ | 65,646 |
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):
| For the year ended December 31,
| 2017 | 2016 | 2015
Gross realized gains | $ | 4,476 |  | $ | 3,978 |  | $ | 2,142 |
Gross realized losses | — |  | (465 | ) | (12 | )
Investment security gains (losses) | $ | 4,476 |  | $ | 3,513 |  | $ | 2,130 |

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + 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=82897076&loc=d3e27290-111563 Reference 2: 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=82897076&loc=d3e27405-111563 Reference 3: 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=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 Reference 8: 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=75019621&loc=d3e62557-112803 + Details
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