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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 | $ 129,858 | $ 50,769
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 3,512 | 370
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 43,597
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 935
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 129,858 | 94,366
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 3,512 | 1,305
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 | 20,352 | 8,157
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 973 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 24,444
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 516
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20,352 | 32,601
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 973 | 518
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 | 89,062 | 42,345
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,805 | 367
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 18,184
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 413
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 89,062 | 60,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,805 | 780
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 | 20,444 | 267
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 734 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 969
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 20,444 | 1,236
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 734 | $ 7

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