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Investments (Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less than twelve months | $ (336) | $ (1,687)
Fair Value, Less than twelve months | 72,463 | 201,472
Gross Unrealized Losses, Twelve months or more | (359) | (493)
Fair Value, Twelve months or more | 51,187 | 39,358
U.S. Government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less than twelve months | (3) | (62)
Fair Value, Less than twelve months | 3,301 | 10,329
Gross Unrealized Losses, Twelve months or more | 0 | 0
Fair Value, Twelve months or more | 0 | 0
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less than twelve months | (323) | (1,608)
Fair Value, Less than twelve months | 67,579 | 187,734
Gross Unrealized Losses, Twelve months or more | (359) | (454)
Fair Value, Twelve months or more | 51,187 | 35,511
State and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less than twelve months | (10) | (17)
Fair Value, Less than twelve months | 1,583 | 3,409
Gross Unrealized Losses, Twelve months or more | 0 | (39)
Fair Value, Twelve months or more | $ 0 | $ 3,847

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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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- 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 less than twelve months. + 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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