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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) | Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 31 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 267,500,000 | $ 213,997,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (3,472,000) | $ (1,302,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 24,014,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ (414,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 31 | 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 267,500,000 | $ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (3,472,000) | $ (1,716,000)
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 1 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 9,811,000 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (127,000) | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 1 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 9,811,000 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (127,000) | $ 0
Obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 7 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 62,483,000 | $ 88,584,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (383,000) | $ (379,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 14,542,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ (188,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 7 | 12
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 62,483,000 | $ 103,126,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (383,000) | $ (567,000)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 10 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 83,031,000 | $ 61,211,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (734,000) | $ (316,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 10 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 83,031,000 | $ 61,211,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (734,000) | $ (316,000)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 2 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 10,022,000 | $ 7,993,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (232,000) | $ (151,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 2 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 10,022,000 | $ 7,993,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (232,000) | $ (151,000)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 10 | 5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 96,576,000 | $ 50,839,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (1,950,000) | $ (450,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 9,472,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ (226,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 10 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 96,576,000 | $ 60,311,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (1,950,000) | $ (676,000)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 1 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 5,577,000 | $ 5,370,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (46,000) | $ (6,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 1 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 5,577,000 | $ 5,370,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (46,000) | $ (6,000)
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 31 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 267,500,000 | $ 213,997,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ (3,472,000) | $ (1,302,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 24,014,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ (414,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 31 | 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 267,500,000 | $ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ (3,472,000) | $ (1,716,000)
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Unrealized Losses | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Positions | security | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses, Total | $ 0 | $ 0

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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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