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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | $ 273,453 | $ 99,070
Unrealized Losses (Less than 12 months) | (6,144) | (1,062)
Fair Value (Estimated) (12 months or more) | 55,942 | 3,878
Unrealized Losses (12 months or more) | (2,297) | (88)
Fair Value (Estimated) | 329,395 | 102,948
Unrealized Losses | (8,441) | (1,150)
U.S. Government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 24,030 | 30,212
Unrealized Losses (Less than 12 months) | (920) | (333)
Fair Value (Estimated) (12 months or more) | 29,170 | 0
Unrealized Losses (12 months or more) | (1,375) | 0
Fair Value (Estimated) | 53,200 | 30,212
Unrealized Losses | (2,295) | (333)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 216,461 | 65,505
Unrealized Losses (Less than 12 months) | (4,768) | (724)
Fair Value (Estimated) (12 months or more) | 26,772 | 3,878
Unrealized Losses (12 months or more) | (922) | (88)
Fair Value (Estimated) | 243,233 | 69,383
Unrealized Losses | (5,690) | (812)
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 29,528 | 855
Unrealized Losses (Less than 12 months) | (390) | (3)
Fair Value (Estimated) (12 months or more) | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0
Fair Value (Estimated) | 29,528 | 855
Unrealized Losses | (390) | (3)
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 3,434 | 2,498
Unrealized Losses (Less than 12 months) | (66) | (2)
Fair Value (Estimated) (12 months or more) | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0
Fair Value (Estimated) | 3,434 | 2,498
Unrealized Losses | $ (66) | $ (2)

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