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Investments - Gross Unrealized Losses - Tabular Disclosure (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses, Less than twelve months | $ (119) | $ (639)
Fair Value, Less than twelve months | 14,707 | 123,520
Gross Unrealized Losses, Twelve months or more | (128) | (896)
Fair Value, Twelve months or more | 11,304 | 81,227
U.S. Government Agencies [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses, Less than twelve months | (3) | (32)
Fair Value, Less than twelve months | 1,199 | 3,240
Gross Unrealized Losses, Twelve months or more | (46) | (72)
Fair Value, Twelve months or more | 2,587 | 2,689
Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses, Less than twelve months | (94) | (494)
Fair Value, Less than twelve months | 7,717 | 100,518
Gross Unrealized Losses, Twelve months or more | (82) | (824)
Fair Value, Twelve months or more | 8,717 | 78,538
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses, Less than twelve months | (22) | (113)
Fair Value, Less than twelve months | $ 5,791 | $ 19,762

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