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Securities - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) $ in Thousands | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 20 | 21
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 137,097 | $ 167,839
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ (701) | $ (1,757)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 7 | 44
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 27,788 | $ 307,481
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ (252) | $ (6,871)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 27 | 65
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 164,885 | $ 475,320
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (953) | $ (8,628)
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 0 | 0
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 0 | $ 0
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 0 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 0 | $ 9,736
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ 0 | $ (222)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 0 | 1
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 0 | $ 9,736
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 0 | $ (222)
Obligations of U.S. government corporations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 3 | 7
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 22,638 | $ 67,649
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ (45) | $ (613)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 0 | 6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 0 | $ 35,760
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ 0 | $ (461)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 3 | 13
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 22,638 | $ 103,409
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (45) | $ (1,074)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 6 | 2
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 23,393 | $ 12,495
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ (73) | $ (44)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 6 | 14
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 25,254 | $ 76,179
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ (231) | $ (1,941)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 12 | 16
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 48,647 | $ 88,674
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (304) | $ (1,985)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 1 | 2
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 982 | $ 2,327
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ (2) | $ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 1 | 3
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 2,534 | $ 9,241
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ (21) | $ (372)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 2 | 5
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 3,516 | $ 11,568
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (23) | $ (417)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 9 | 8
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 90,005 | $ 75,466
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ (581) | $ (1,032)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 0 | 19
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 0 | $ 171,318
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ 0 | $ (3,844)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 9 | 27
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 90,005 | $ 246,784
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (581) | $ (4,876)
Corporate Obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security | [1] | 1 |
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value | [1] | $ 79 |
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses | [1] | $ 0 |
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | [1] | 0 |
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | [1] | $ 0 |
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | [1] | $ 0 |
Temporarily Impaired Debt Securities, Number of Securities | security | [1] | 1 |
Temporarily Impaired Debt Securities, Fair Value, Total | [1] | $ 79 |
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | [1] | $ 0 |
Obligations of states and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Temporarily Impaired Debt Securities, Less than 12 Months, Number of Securities | security |  | 0 | 2
Temporarily Impaired Debt Securities, Less than 12 Months, Fair Value |  | $ 0 | $ 9,902
Temporarily Impaired Debt Securities, Less than 12 Months, Unrealized Losses |  | $ 0 | $ (23)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security |  | 0 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value |  | $ 0 | $ 5,247
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses |  | $ 0 | $ (31)
Temporarily Impaired Debt Securities, Number of Securities | security |  | 0 | 3
Temporarily Impaired Debt Securities, Fair Value, Total |  | $ 0 | $ 15,149
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 0 | $ (54)
[1] | Unrealized loss on Corporate Obligations rounded to less than one thousand dollars.

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