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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 233,428 | $ 432,522
12 Months or Longer | 27,238 | 255,149
Total | 260,666 | 687,671
Gross Unrealized Losses |  |
Less than 12 Months | 1,599 | 6,361
12 Months or Longer | 92 | 7,892
Total | 1,691 | 14,253
Fair Value |  |
Less than 12 Months | 151,399 | 117,780
12 Months or Longer | 21,007 | 127,126
Total | 172,406 | 244,906
Gross Unrealized Losses |  |
Less than 12 Months | 508 | 1,245
12 Months or Longer | 96 | 3,496
Total | 604 | 4,741
Less than 12 Months, Fair Value | 384,827 | 550,302
12 Months or Longer, Fair Value | 48,245 | 382,275
Total, Fair Value | 433,072 | 932,577
Less than 12 Months, Gross Unrealized Losses | 2,107 | 7,606
12 Months or Longer, Gross Unrealized Losses | 188 | 11,388
Total, Gross Unrealized Losses | 2,295 | 18,994
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | 25,033 | 1,490
12 Months or Longer | 0 | 0
Total | 25,033 | 1,490
Gross Unrealized Losses |  |
Less than 12 Months | 26 | 3
12 Months or Longer | 0 | 0
Total | 26 | 3
Fair Value |  |
Less than 12 Months | 23,983 | 0
12 Months or Longer | 12,440 | 22,073
Total | 36,423 | 22,073
Gross Unrealized Losses |  |
Less than 12 Months | 35 | 0
12 Months or Longer | 60 | 545
Total | 95 | 545
State and municipal |  |
Fair Value |  |
Less than 12 Months | 53,220 | 234,431
12 Months or Longer | 0 | 38,028
Total | 53,220 | 272,459
Gross Unrealized Losses |  |
Less than 12 Months | 634 | 3,958
12 Months or Longer | 0 | 1,896
Total | 634 | 5,854
Fair Value |  |
Less than 12 Months | 3,351 | 14,952
12 Months or Longer | 0 | 16,786
Total | 3,351 | 31,738
Gross Unrealized Losses |  |
Less than 12 Months | 40 | 369
12 Months or Longer | 0 | 503
Total | 40 | 872
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | 155,175 | 196,601
12 Months or Longer | 27,238 | 217,121
Total | 182,413 | 413,722
Gross Unrealized Losses |  |
Less than 12 Months | 939 | 2,400
12 Months or Longer | 92 | 5,996
Total | 1,031 | 8,396
Fair Value |  |
Less than 12 Months | 122,572 | 102,828
12 Months or Longer | 8,567 | 87,268
Total | 131,139 | 190,096
Gross Unrealized Losses |  |
Less than 12 Months | 426 | 876
12 Months or Longer | 36 | 2,447
Total | 462 | 3,323
Foreign investment |  |
Fair Value |  |
Less than 12 Months | 1,493 | 0
12 Months or Longer | 0 | 999
Total | 1,493 | 999
Gross Unrealized Losses |  |
Less than 12 Months | 7 | 0
12 Months or Longer | 0 | 1
Total | $ 7 | $ 1

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