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Securities Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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