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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 69,830 | $ 129,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 484 | 3,512
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 81,237 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,296 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 151,067 | 129,858
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 2,780 | 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 | 14,381 | 20,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 99 | 973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 20,353 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 805 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 34,734 | 20,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 904 | 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 | 53,440 | 89,062
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 363 | 1,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 50,729 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,276 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 104,169 | 89,062
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,639 | 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 | 2,009 | 20,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 22 | 734
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,155 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 215 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 12,164 | 20,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 237 | $ 734

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