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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 43,727 | $ 77,148 | $ 5,148
Unrealized Losses (Less than 12 months) | (204) | (588) | (9)
Fair Value (Estimated) (12 months or more) | 4,771 | 19,000 | 79,595
Unrealized Losses (12 months or more) | (143) | (498) | (1,277)
Fair Value (Estimated) | 48,498 | 96,148 | 84,743
Unrealized Losses | (347) | (1,086) | (1,286)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 7,988 | 12,372 |
Unrealized Losses (Less than 12 months) | (12) | (128) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 7,988 | 12,372 |
Unrealized Losses | (12) | (128) |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 28,116 | 54,244 | 4,150
Unrealized Losses (Less than 12 months) | (160) | (359) | 0
Fair Value (Estimated) (12 months or more) | 4,771 | 18,696 | 49,270
Unrealized Losses (12 months or more) | (143) | (490) | (790)
Fair Value (Estimated) | 32,887 | 72,940 | 53,420
Unrealized Losses | (303) | (849) | (790)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 7,623 | 10,532 | 998
Unrealized Losses (Less than 12 months) | (32) | (101) | (9)
Fair Value (Estimated) (12 months or more) | 0 | 304 | 30,325
Unrealized Losses (12 months or more) | 0 | (8) | (487)
Fair Value (Estimated) | 7,623 | 10,836 | 31,323
Unrealized Losses | $ (32) | $ (109) | $ (496)

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