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Securities Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
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