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Securities (Investments' Gross Unrealized Losses and Fair Value) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($)
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | $ 241,676 | $ 251,615
Less than 12 Months, Unrealized Losses | (6,474) | (7,462)
12 Months or More, Fair Value | 9,665 | 10,172
12 Months or More, Unrealized Losses | (284) | (314)
Total, Fair Value | 251,341 | 261,787
Total, Unrealized Losses | $ (6,758) | (7,776)
Debt securities in unrealized loss position in the less than twelve months category | security | 224 |
Debt securities in unrealized loss position in the twelve months or more category | security | 12 |
Impairment of investments | $ 0 |
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 1,996 | 1,997
Less than 12 Months, Unrealized Losses | (8) | (8)
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total, Fair Value | 1,996 | 1,997
Total, Unrealized Losses | (8) | (8)
States and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 86,377 | 90,109
Less than 12 Months, Unrealized Losses | (2,623) | (3,362)
12 Months or More, Fair Value | 207 | 205
12 Months or More, Unrealized Losses | (4) | (6)
Total, Fair Value | 86,584 | 90,314
Total, Unrealized Losses | (2,627) | (3,368)
Corporate obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 6,903 | 6,895
Less than 12 Months, Unrealized Losses | (142) | (180)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total, Fair Value | 6,903 | 6,895
Total, Unrealized Losses | (142) | (180)
Mortgage-backed securities-government sponsored entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 146,400 | 152,614
Less than 12 Months, Unrealized Losses | (3,701) | (3,912)
12 Months or More, Fair Value | 9,458 | 9,967
12 Months or More, Unrealized Losses | (280) | (308)
Total, Fair Value | 155,858 | 162,581
Total, Unrealized Losses | $ (3,981) | $ (4,220)

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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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