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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 64,655 | $ 129,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 593 | 3,512
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 57,416 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,598 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 122,071 | 129,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,191 | 3,512
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,871 | 20,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 67 | 973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 15,655 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 587 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 25,526 | 20,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 654 | 973
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 46,620 | 89,062
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 375 | 1,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 34,051 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 799 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 80,671 | 89,062
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,174 | 1,805
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 8,164 | 20,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 151 | 734
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,710 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 212 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 15,874 | 20,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 363 | $ 734

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