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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, 2019 | Dec. 31, 2018
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | $ 203,946 | $ 432,522
Less than 12 Months, Gross Unrealized Losses | 2,133 | 6,361
12 Months or Longer, Fair Value | 20,796 | 255,149
12 Months or Longer, Gross Unrealized Losses | 78 | 7,892
Total, Fair Value | 224,742 | 687,671
Total, Gross Unrealized Losses | 2,211 | 14,253
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 150,216 | 117,780
Less than 12 Months, Gross Unrealized Losses | 475 | 1,245
12 Months or Longer, Fair Value | 20,458 | 127,126
12 Months or Longer, Gross Unrealized Losses | 70 | 3,496
Total, Fair Value | 170,674 | 244,906
Total, Gross Unrealized Losses | 545 | 4,741
Less than 12 Months, Fair Value | 354,162 | 550,302
Less than 12 Months, Gross Unrealized Losses | 2,608 | 7,606
12 Months or Longer, Fair Value | 41,254 | 382,275
12 Months or Longer, Gross Unrealized Losses | 148 | 11,388
Total, Fair Value | 395,416 | 932,577
Total, Gross Unrealized Losses | 2,756 | 18,994
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 |  | 0
12 Months or Longer, Gross Unrealized Losses |  | 0
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 | 3,016 | 0
Less than 12 Months, Gross Unrealized Losses | 4 | 0
12 Months or Longer, Fair Value | 12,467 | 22,073
12 Months or Longer, Gross Unrealized Losses | 33 | 545
Total, Fair Value | 15,483 | 22,073
Total, Gross Unrealized Losses | 37 | 545
State and municipal |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 76,273 | 234,431
Less than 12 Months, Gross Unrealized Losses | 807 | 3,958
12 Months or Longer, Fair Value | 0 | 38,028
12 Months or Longer, Gross Unrealized Losses | 0 | 1,896
Total, Fair Value | 76,273 | 272,459
Total, Gross Unrealized Losses | 807 | 5,854
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 22,947 | 14,952
Less than 12 Months, Gross Unrealized Losses | 107 | 369
12 Months or Longer, Fair Value | 0 | 16,786
12 Months or Longer, Gross Unrealized Losses | 0 | 503
Total, Fair Value | 22,947 | 31,738
Total, Gross Unrealized Losses | 107 | 872
U.S. Government-sponsored mortgage-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 127,673 | 196,601
Less than 12 Months, Gross Unrealized Losses | 1,326 | 2,400
12 Months or Longer, Fair Value | 20,796 | 217,121
12 Months or Longer, Gross Unrealized Losses | 78 | 5,996
Total, Fair Value | 148,469 | 413,722
Total, Gross Unrealized Losses | 1,404 | 8,396
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value | 124,253 | 102,828
Less than 12 Months, Gross Unrealized Losses | 364 | 876
12 Months or Longer, Fair Value | 7,991 | 87,268
12 Months or Longer, Gross Unrealized Losses | 37 | 2,447
Total, Fair Value | 132,244 | 190,096
Total, Gross Unrealized Losses | $ 401 | 3,323
Foreign investment |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 Months, Gross Unrealized Losses |  | 0
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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