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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 119,892 | $ 69,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,226 | 484
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 77,947 | 81,237
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,722 | 2,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 197,839 | 151,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5,948 | 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 | 29,050 | 14,381
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 264 | 99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 19,981 | 20,353
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,135 | 805
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 49,031 | 34,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,399 | 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 | 77,341 | 53,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,710 | 363
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 48,048 | 50,729
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,161 | 1,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 125,389 | 104,169
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3,871 | 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 | 13,501 | 2,009
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 252 | 22
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 9,918 | 10,155
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 426 | 215
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 23,419 | 12,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 678 | $ 237

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