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Investment Securities - Credit Quality Indicator (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | $ 47,475 | $ 40,927
State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 22,003 | 27,082
Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 1,175 | $ 3,049
Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 865 |
Aaa/AAA | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 16,715 |
Aa/AA | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 2,018 |
A | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Baa | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 426 |
Baa | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 1,979 |
Not Rated | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 1,175 |
Not Guaranteed or Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 14,706 |
Not Guaranteed or Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 865 |
Not Guaranteed or Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 11,270 |
Not Guaranteed or Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 960 |
Not Guaranteed or Pre-Refunded | Baa | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Not Guaranteed or Pre-Refunded | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 1,611 |
Other Credit Enhancement or Insurance | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 7,297 |
Other Credit Enhancement or Insurance | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Other Credit Enhancement or Insurance | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 5,445 |
Other Credit Enhancement or Insurance | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 1,058 |
Other Credit Enhancement or Insurance | Baa | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 426 |
Other Credit Enhancement or Insurance | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 368 |
Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Pre-Refunded | Baa | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | 0 |
Pre-Refunded | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Net carrying amount | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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