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Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months $ 506,280 $ 261,855
12 Months or Longer 449,569 536,586
Total 955,849 798,441
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months 5,998 2,856
12 Months or Longer 19,917 7,553
Total 25,915 10,409
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 Months 124,616 33,975
12 Months or Longer 77,654 45,498
Total 202,270 79,473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months 1,933 232
12 Months or Longer 1,742 519
Total 3,675 751
Obligations of U.S. Treasury and other U.S. Government sponsored entities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months   24,931
12 Months or Longer   217,789
Total   242,720
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months   70
12 Months or Longer   2,210
Total   2,280
U.S. Government sponsored entity asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months 506,280 236,924
12 Months or Longer 449,569 318,797
Total 955,849 555,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months 5,998 2,786
12 Months or Longer 19,917 5,343
Total 25,915 8,129
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 Months 32,656 7,331
12 Months or Longer 6,931  
Total 39,587 7,331
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months 838 38
12 Months or Longer 165  
Total 1,003 38
Obligations of States and Political Subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 Months 91,960 26,644
12 Months or Longer 70,723 45,498
Total 162,683 72,142
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 Months 1,095 194
12 Months or Longer 1,577 519
Total $ 2,672 $ 713