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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ 105,005 | $ 69,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,619 | 484
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 100,883 | 81,237
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 5,676 | 2,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 205,888 | 151,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 8,295 | 2,780
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 | 25,953 | 14,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 418 | 99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 24,536 | 20,353
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,481 | 805
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 50,489 | 34,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,899 | 904
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 | 51,338 | 53,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,622 | 363
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 65,789 | 50,729
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,608 | 1,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 117,127 | 104,169
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5,230 | 1,639
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 | 27,714 | 2,009
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 579 | 22
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,558 | 10,155
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 587 | 215
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 38,272 | 12,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 1,166 | $ 237

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