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Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | $ 432,522 | $ 196,051
Less than 12 Months, Gross Unrealized Losses | 6,361 | 1,718
12 Months or Longer, Fair Value | 255,149 | 103,991
12 Months or Longer, Gross Unrealized Losses | 7,892 | 2,796
Total, Fair Value | 687,671 | 300,042
Total, Gross Unrealized Losses | 14,253 | 4,514
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 117,780 | 74,926
Less than 12 Months, Gross Unrealized Losses | 1,245 | 652
12 Months or Longer, Fair Value | 127,126 | 71,079
12 Months or Longer, Gross Unrealized Losses | 3,496 | 1,431
Total, Fair Value | 244,906 | 146,005
Total, Gross Unrealized Losses | 4,741 | 2,083
Available-for-sale Securities and Held-to-maturity Securities [Abstract] (Deprecated 2018-01-31) |  |
Less than 12 Months, Fair Value | 550,302 | 270,977
Less than 12 Months, Gross Unrealized Losses | 7,606 | 2,370
12 Months or Longer, Fair Value | 382,275 | 175,070
12 Months or Longer, Gross Unrealized Losses | 11,388 | 4,227
Total, Fair Value | 932,577 | 446,047
Total, Gross Unrealized Losses | 18,994 | 6,597
Government Agency and Municipal Bonds and Notes |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 1,490 |
Less than 12 Months, Gross Unrealized Losses | 3 |
12 Months or Longer, Fair Value |  |
12 Months or Longer, Gross Unrealized Losses |  |
Total, Fair Value | 1,490 |
Total, Gross Unrealized Losses | 3 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value |  | 9,988
Less than 12 Months, Gross Unrealized Losses |  | 131
12 Months or Longer, Fair Value | 22,073 | 12,196
12 Months or Longer, Gross Unrealized Losses | 545 | 304
Total, Fair Value | 22,073 | 22,184
Total, Gross Unrealized Losses | 545 | 435
State and municipal |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 234,431 | 13,296
Less than 12 Months, Gross Unrealized Losses | 3,958 | 198
12 Months or Longer, Fair Value | 38,028 | 35,324
12 Months or Longer, Gross Unrealized Losses | 1,896 | 893
Total, Fair Value | 272,459 | 48,620
Total, Gross Unrealized Losses | 5,854 | 1,091
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 14,952 | 2,430
Less than 12 Months, Gross Unrealized Losses | 369 | 36
12 Months or Longer, Fair Value | 16,786 | 15,805
12 Months or Longer, Gross Unrealized Losses | 503 | 208
Total, Fair Value | 31,738 | 18,235
Total, Gross Unrealized Losses | 872 | 244
U.S. Government-sponsored mortgage-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 196,601 | 182,755
Less than 12 Months, Gross Unrealized Losses | 2,400 | 1,520
12 Months or Longer, Fair Value | 217,121 | 68,667
12 Months or Longer, Gross Unrealized Losses | 5,996 | 1,903
Total, Fair Value | 413,722 | 251,422
Total, Gross Unrealized Losses | 8,396 | 3,423
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 102,828 | 62,508
Less than 12 Months, Gross Unrealized Losses | 876 | 485
12 Months or Longer, Fair Value | 87,268 | 43,078
12 Months or Longer, Gross Unrealized Losses | 2,447 | 919
Total, Fair Value | 190,096 | 105,586
Total, Gross Unrealized Losses | 3,323 | $ 1,404
Foreign Investment |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value |  |
Less than 12 Months, Gross Unrealized Losses |  |
12 Months or Longer, Fair Value | 999 |
12 Months or Longer, Gross Unrealized Losses | 1 |
Total, Fair Value | 999 |
Total, Gross Unrealized Losses | $ 1 |

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