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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Sep. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 1 | 20
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 499 | $ 137,097
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (1) | $ (701)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 27,788
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (252)
Temporarily Impaired Debt Securities, Number of Securities | security | 1 | 27
Temporarily Impaired Debt Securities, Fair Value, Total | $ 499 | $ 164,885
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1) | $ (953)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 0
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ 0
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 3
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 22,638
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 3
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 22,638
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (45)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 6
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 23,393
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (73)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 25,254
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (231)
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 12
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 48,647
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (304)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 982
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (2)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 2,534
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (21)
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 2
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 3,516
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (23)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 9
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 90,005
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (581)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 9
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 90,005
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (581)
Corporate obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 499 | $ 79
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (1) | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, Fair Value, Total | $ 499 | $ 79
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1) | $ 0
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, Fair Value, Total | $ 0 | $ 0
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ 0

X
- 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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: 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 + Details
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