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Securities (Investments' Gross Unrealized Losses and Fair Value) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($)
Schedule of Investments [Line Items] |  |
Debt securities in unrealized loss position in the less than twelve months category | security | 235 |
Debt securities in unrealized loss position in the twelve months or more category | security | 12 |
Impairment of investments | $ 0 |
U.S. Government Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 1,997 | $ 6,058
Less than 12 Months, Unrealized Losses | (8) | (71)
12 Months or More, Fair Value | 0 | 2,109
12 Months or More, Unrealized Losses | 0 | (37)
Total, Fair Value | 1,997 | 8,167
Total, Unrealized Losses | (8) | (108)
States and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 90,109 | 9,086
Less than 12 Months, Unrealized Losses | (3,362) | (99)
12 Months or More, Fair Value | 205 | 1,417
12 Months or More, Unrealized Losses | (6) | (13)
Total, Fair Value | 90,314 | 10,503
Total, Unrealized Losses | (3,368) | (112)
Corporate obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 6,895 | 2,221
Less than 12 Months, Unrealized Losses | (180) | (4)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total, Fair Value | 6,895 | 2,221
Total, Unrealized Losses | (180) | (4)
Mortgage-backed securities-government sponsored entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 152,614 | 40,300
Less than 12 Months, Unrealized Losses | (3,912) | (432)
12 Months or More, Fair Value | 9,967 | 16,595
12 Months or More, Unrealized Losses | (308) | (513)
Total, Fair Value | 162,581 | 56,895
Total, Unrealized Losses | (4,220) | (945)
Total Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 251,615 | 57,665
Less than 12 Months, Unrealized Losses | (7,462) | (606)
12 Months or More, Fair Value | 10,172 | 20,121
12 Months or More, Unrealized Losses | (314) | (563)
Total, Fair Value | 261,787 | 77,786
Total, Unrealized Losses | $ (7,776) | $ (1,169)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&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 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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