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Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | $ 164 | $ 125 | $ 253 | $ 416
Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 |  | 0 | 97
Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 | 91 | 89 | 180
Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 164 | 34 | 164 | 139
Residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 164 | 125 | 253 | 339
Residential | Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  | 0 | 37
Residential | Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 | 91 | 89 | 163
Residential | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | $ 164 | $ 34 | $ 164 | 139
Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 70
Home equity | Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 60
Home equity | Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 10
Home equity | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 0
Individuals' loans for household and other personal expenditures |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 7
Individuals' loans for household and other personal expenditures | Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 0
Individuals' loans for household and other personal expenditures | Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 7
Individuals' loans for household and other personal expenditures | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | $ 0

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