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Other Real Estate Owned and Repossessions - Summary of Foreclosed Property Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Other Real Estate And Other Assets Acquired In Foreclosure [Line Items] |  |  |
Beginning balance |  | $ 1,505 | $ 3,792
Additions | [1] | 313 | 456
Sales proceeds |  | (664) | (2,656)
Gross gains |  | 39 | 282
Gross losses |  | (77) | (127)
Net gains (losses) |  | (38) | 155
Impairment |  | (38) | (242)
Ending balance |  | 1,078 | 1,505
FUSB [Member] |  |  |
Other Real Estate And Other Assets Acquired In Foreclosure [Line Items] |  |  |
Beginning balance |  | 1,401 | 3,527
Additions | [1] | 224 | 399
Sales proceeds |  | (582) | (2,567)
Gross gains |  | 37 | 267
Gross losses |  | (51) | (46)
Net gains (losses) |  | (14) | 221
Impairment |  |  | (179)
Ending balance |  | 1,029 | 1,401
ALC [Member] |  |  |
Other Real Estate And Other Assets Acquired In Foreclosure [Line Items] |  |  |
Beginning balance |  | 104 | 265
Additions | [1] | 89 | 57
Sales proceeds |  | (82) | (89)
Gross gains |  | 2 | 15
Gross losses |  | (26) | (81)
Net gains (losses) |  | (24) | (66)
Impairment |  | (38) | (63)
Ending balance |  | $ 49 | $ 104
[1] | Additions to OREO include transfers from loans, capitalized improvements to existing OREO properties and OREO acquired through acquisitions.

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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