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Securities (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale Securities    
Less Than 12 Months, Fair Value $ 829,108 $ 606,155
Less Than 12 Months, Unrealized Losses 13,945 6,211
12 Months or Longer, Fair Value 150,125 218,918
12 Months or Longer, Unrealized Losses 5,474 7,906
Total Fair Value 979,233 825,073
Total Unrealized Losses 19,419 14,117
Held-to-Maturity Securities    
Less Than 12 Months, Fair Value 43,369 31,637
Less Than 12 Months, Unrealized Losses 286 448
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Unrealized Losses 0 0
Total Fair Value 43,369 31,637
Total Unrealized Losses 286 448
Obligations of U.S. Government sponsored entities    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 208,940 183,697
Less Than 12 Months, Unrealized Losses 2,303 1,618
12 Months or Longer, Fair Value 0 5,844
12 Months or Longer, Unrealized Losses 0 177
Total Fair Value 208,940 189,541
Total Unrealized Losses 2,303 1,795
Held-to-Maturity Securities    
Less Than 12 Months, Fair Value 40,802 29,671
Less Than 12 Months, Unrealized Losses 283 444
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Unrealized Losses 0 0
Total Fair Value 40,802 29,671
Total Unrealized Losses 283 444
Obligations of U.S. sponsored entities    
Held-to-Maturity Securities    
Less Than 12 Months, Fair Value 2,567  
Less Than 12 Months, Unrealized Losses 3  
12 Months or Longer, Fair Value 0  
12 Months or Longer, Unrealized Losses 0  
Total Fair Value 2,567  
Total Unrealized Losses 3  
Obligations of U.S. states and political subdivisions    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 58,852 25,402
Less Than 12 Months, Unrealized Losses 1,139 141
12 Months or Longer, Fair Value 751 3,408
12 Months or Longer, Unrealized Losses 1 12
Total Fair Value 59,603 28,810
Total Unrealized Losses 1,140 153
Held-to-Maturity Securities    
Less Than 12 Months, Fair Value   1,966
Less Than 12 Months, Unrealized Losses   4
12 Months or Longer, Fair Value   0
12 Months or Longer, Unrealized Losses   0
Total Fair Value   1,966
Total Unrealized Losses   4
U.S. Government agencies    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 98,307 32,636
Less Than 12 Months, Unrealized Losses 1,570 350
12 Months or Longer, Fair Value 22,376 30,244
12 Months or Longer, Unrealized Losses 702 966
Total Fair Value 120,683 62,880
Total Unrealized Losses 2,272 1,316
U.S. Government sponsored entities    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 463,009 364,420
Less Than 12 Months, Unrealized Losses 8,933 4,102
12 Months or Longer, Fair Value 123,915 176,325
12 Months or Longer, Unrealized Losses 4,354 6,347
Total Fair Value 586,924 540,745
Total Unrealized Losses 13,287 10,449
U.S. corporate debt securities    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 2,162 2,163
12 Months or Longer, Unrealized Losses 338 338
Total Fair Value 2,162 2,163
Total Unrealized Losses 338 338
Equity securities    
Available-for-Sale Securities    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Losses 0 0
12 Months or Longer, Fair Value 921 934
12 Months or Longer, Unrealized Losses 79 66
Total Fair Value 921 934
Total Unrealized Losses $ 79 $ 66