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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 264,229 | $ 99,070 | $ 22,519
Unrealized Losses (Less than 12 months) | (9,830) | (1,062) | (372)
Fair Value (Estimated) (12 months or more) | 3,744 | 3,878 | 7,424
Unrealized Losses (12 months or more) | (130) | (88) | (169)
Fair Value (Estimated) | 267,973 | 102,948 | 29,943
Unrealized Losses | (9,960) | (1,150) | (541)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 51,894 | 30,212 |
Unrealized Losses (Less than 12 months) | (3,601) | (333) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 51,894 | 30,212 |
Unrealized Losses | (3,601) | (333) |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 180,138 | 65,505 | 2,963
Unrealized Losses (Less than 12 months) | (5,335) | (724) | (27)
Fair Value (Estimated) (12 months or more) | 3,744 | 3,878 | 7,424
Unrealized Losses (12 months or more) | (130) | (88) | (169)
Fair Value (Estimated) | 183,882 | 69,383 | 10,387
Unrealized Losses | (5,465) | (812) | (196)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 28,783 | 855 | 19,556
Unrealized Losses (Less than 12 months) | (808) | (3) | (345)
Fair Value (Estimated) (12 months or more) | 0 | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0 | 0
Fair Value (Estimated) | 28,783 | 855 | 19,556
Unrealized Losses | (808) | (3) | $ (345)
Corporate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 3,414 | 2,498 |
Unrealized Losses (Less than 12 months) | (86) | (2) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 3,414 | 2,498 |
Unrealized Losses | $ (86) | $ (2) |

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