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Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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