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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | $ 99,070 | $ 77,148
Less than 12 months, Unrealized Losses | (1,062) | (588)
12 months or more, Fair Value | 3,878 | 19,000
12 months or more, Unrealized Losses | (88) | (498)
Fair Value | 102,948 | 96,148
Unrealized Losses | (1,150) | (1,086)
U.S. government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 30,212 | 12,372
Less than 12 months, Unrealized Losses | (333) | (128)
12 months or more, Fair Value | 0 | 0
12 months or more, Unrealized Losses | 0 | 0
Fair Value | 30,212 | 12,372
Unrealized Losses | (333) | (128)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 65,505 | 54,244
Less than 12 months, Unrealized Losses | (724) | (359)
12 months or more, Fair Value | 3,878 | 18,696
12 months or more, Unrealized Losses | (88) | (490)
Fair Value | 69,383 | 72,940
Unrealized Losses | (812) | (849)
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 855 | 10,532
Less than 12 months, Unrealized Losses | (3) | (101)
12 months or more, Fair Value | 0 | 304
12 months or more, Unrealized Losses | 0 | (8)
Fair Value | 855 | 10,836
Unrealized Losses | (3) | $ (109)
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value | 2,498 |
Less than 12 months, Unrealized Losses | (2) |
12 months or more, Fair Value | 0 |
12 months or more, Unrealized Losses | 0 |
Fair Value | 2,498 |
Unrealized Losses | $ (2) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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