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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, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 22,515 | $ 203,946
12 Months or Longer | 0 | 20,796
Total | 22,515 | 224,742
Gross Unrealized Losses |  |
Less than 12 Months | 187 | 2,133
12 Months or Longer | 0 | 78
Total | 187 | 2,211
Fair Value |  |
Less than 12 Months | 133,879 | 150,216
12 Months or Longer | 0 | 20,458
Total | 133,879 | 170,674
Gross Unrealized Losses |  |
Less than 12 Months | 1,278 | 475
12 Months or Longer | 0 | 70
Total | 1,278 | 545
Less than 12 Months, Fair Value | 156,394 | 354,162
12 Months or Longer, Fair Value | 0 | 41,254
Total, Fair Value | 156,394 | 395,416
Less than 12 Months, Gross Unrealized Losses | 1,465 | 2,608
12 Months or Longer, Gross Unrealized Losses | 0 | 148
Total, Gross Unrealized Losses | 1,465 | 2,756
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | 20,961 | 3,016
12 Months or Longer | 0 | 12,467
Total | 20,961 | 15,483
Gross Unrealized Losses |  |
Less than 12 Months | 33 | 4
12 Months or Longer | 0 | 33
Total | 33 | 37
State and municipal |  |
Fair Value |  |
Less than 12 Months | 22,515 | 76,273
12 Months or Longer | 0 | 0
Total | 22,515 | 76,273
Gross Unrealized Losses |  |
Less than 12 Months | 187 | 807
12 Months or Longer | 0 | 0
Total | 187 | 807
Fair Value |  |
Less than 12 Months | 101,136 | 22,947
12 Months or Longer | 0 | 0
Total | 101,136 | 22,947
Gross Unrealized Losses |  |
Less than 12 Months | 1,240 | 107
12 Months or Longer | 0 | 0
Total | 1,240 | 107
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months |  | 127,673
12 Months or Longer |  | 20,796
Total |  | 148,469
Gross Unrealized Losses |  |
Less than 12 Months |  | 1,326
12 Months or Longer |  | 78
Total |  | 1,404
Fair Value |  |
Less than 12 Months | 10,284 | 124,253
12 Months or Longer | 0 | 7,991
Total | 10,284 | 132,244
Gross Unrealized Losses |  |
Less than 12 Months | 3 | 364
12 Months or Longer | 0 | 37
Total | 3 | $ 401
Foreign investment |  |
Fair Value |  |
Less than 12 Months | 1,498 |
12 Months or Longer | 0 |
Total | 1,498 |
Gross Unrealized Losses |  |
Less than 12 Months | 2 |
12 Months or Longer | 0 |
Total | $ 2 |

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