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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 115,834 | $ 77,148 | $ 35,322
Unrealized Losses (Less than 12 months) | (1,243) | (588) | (275)
Fair Value (Estimated) (12 months or more) | 4,216 | 19,000 | 22,875
Unrealized Losses (12 months or more) | (114) | (498) | (479)
Fair Value (Estimated) | 120,050 | 96,148 | 58,197
Unrealized Losses | (1,357) | (1,086) | (754)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 16,817 | 12,372 |
Unrealized Losses (Less than 12 months) | (228) | (128) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 16,817 | 12,372 |
Unrealized Losses | (228) | (128) |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 79,816 | 54,244 | 30,249
Unrealized Losses (Less than 12 months) | (654) | (359) | (233)
Fair Value (Estimated) (12 months or more) | 4,216 | 18,696 | 22,569
Unrealized Losses (12 months or more) | (114) | (490) | (473)
Fair Value (Estimated) | 84,032 | 72,940 | 52,818
Unrealized Losses | (768) | (849) | (706)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 19,201 | 10,532 | 5,073
Unrealized Losses (Less than 12 months) | (361) | (101) | (42)
Fair Value (Estimated) (12 months or more) | 0 | 304 | 306
Unrealized Losses (12 months or more) | 0 | (8) | (6)
Fair Value (Estimated) | 19,201 | 10,836 | 5,379
Unrealized Losses | $ (361) | $ (109) | $ (48)

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