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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 298,520 | $ 99,070 | $ 115,834
Unrealized Losses (Less than 12 months) | (6,986) | (1,062) | (1,243)
Fair Value (Estimated) (12 months or more) | 33,511 | 3,878 | 4,216
Unrealized Losses (12 months or more) | (1,469) | (88) | (114)
Fair Value (Estimated) | 332,031 | 102,948 | 120,050
Unrealized Losses | (8,455) | (1,150) | (1,357)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 37,054 | 30,212 | 16,817
Unrealized Losses (Less than 12 months) | (1,396) | (333) | (228)
Fair Value (Estimated) (12 months or more) | 16,174 | 0 | 0
Unrealized Losses (12 months or more) | (871) | 0 | 0
Fair Value (Estimated) | 53,228 | 30,212 | 16,817
Unrealized Losses | (2,267) | (333) | (228)
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 207,951 | 65,505 | 79,816
Unrealized Losses (Less than 12 months) | (4,207) | (724) | (654)
Fair Value (Estimated) (12 months or more) | 17,337 | 3,878 | 4,216
Unrealized Losses (12 months or more) | (598) | (88) | (114)
Fair Value (Estimated) | 225,288 | 69,383 | 84,032
Unrealized Losses | (4,805) | (812) | (768)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 50,050 | 855 | 19,201
Unrealized Losses (Less than 12 months) | (1,348) | (3) | (361)
Fair Value (Estimated) (12 months or more) | 0 | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0 | 0
Fair Value (Estimated) | 50,050 | 855 | 19,201
Unrealized Losses | (1,348) | (3) | $ (361)
Corporate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 3,465 | 2,498 |
Unrealized Losses (Less than 12 months) | (35) | (2) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 3,465 | 2,498 |
Unrealized Losses | $ (35) | $ (2) |

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