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Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 313,376 | $ 360,520 |  |
Mortgage servicing rights, impairment reserve | 358 | 0 |  |
Allowance for loan losses, other real estate owned | 45 | 0 | $ 0 | $ 53
Allowance for impaired loans | 304 | 1,916 |  |
Mortgage servicing rights | 1,985 | 2,089 |  |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 0 |  |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 1,985 | 2,089 |  |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 0 |  |
Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 1,985 | 2,089 |  |
U.S. government-sponsored agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 22,730 | 7,398 |  |
Mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 243,406 | 326,617 |  |
State and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 39,474 | 26,505 |  |
Asset-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 7,766 |  |  |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 2,640 | 1,767 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Interest rate swap agreements | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 313,376 | 360,520 |  |
Interest rate swap agreements | 2,640 | 1,767 |  |
Derivative liabilities | 8,882 | 1,644 |  |
Assets measured at fair value | 316,016 | 362,287 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Interest rate swap agreements | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 313,376 | 360,520 |  |
Derivative liabilities | 8,882 | 1,644 |  |
Assets measured at fair value | 316,016 | 362,287 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements |  | 0 |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements |  | 562 |  |
Derivative liabilities | 6,242 | 439 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements |  | 0 |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements |  | 562 |  |
Derivative liabilities | 6,242 | 439 |  |
Fair Value, Measurements, Recurring | Customer Loan Interest Swap |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 2,640 | 1,205 |  |
Derivative liabilities | 2,640 | 1,205 |  |
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 2,640 | 1,205 |  |
Derivative liabilities | 2,640 | 1,205 |  |
Fair Value, Measurements, Recurring | Customer Loan Interest Swap | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 0 | 0 |  |
Derivative liabilities | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 22,730 | 7,398 |  |
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. government-sponsored agencies | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 22,730 | 7,398 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 243,406 | 326,617 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 243,406 | 326,617 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 39,474 | 26,505 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 39,474 | 26,505 |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 7,766 |  |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Fair Value, Measurements, Recurring | Asset-backed securities | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 7,766 |  |  |
Fair Value, Measurements, Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 908 | 279 |  |
Impaired loans | 794 | 6,579 |  |
Assets measured at fair value | 3,687 | 8,947 |  |
Fair Value, Measurements, Nonrecurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 0 |  |
Other real estate owned | 0 | 0 |  |
Impaired loans | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Nonrecurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 1,985 | 2,089 |  |
Other real estate owned | 908 | 279 |  |
Impaired loans | 794 | 6,579 |  |
Assets measured at fair value | 3,687 | 8,947 |  |
Fair Value, Measurements, Nonrecurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | 0 | 0 |  |
Other real estate owned | 0 | 0 |  |
Impaired loans | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Nonrecurring | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Mortgage servicing rights | $ 1,985 | $ 2,089 |  |

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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). + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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