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Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | $ 184 | $ 205 | $ 433 | $ 606
Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 |  | 0 | 77
Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 | 112 | 88 | 290
Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 184 | 93 | 345 | 239
Residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 184 | 140 | 433 | 447
Residential | Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  | 0 |
Residential | Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | 0 | 47 | 88 | 208
Residential | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification | $ 184 | 93 | $ 345 | 239
Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  | 65 |  | 153
Home equity | Term Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 77
Home equity | Rate Modification |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  | 65 |  | 76
Home equity | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  | $ 0 |  | 0
Individuals' loans for household and other personal expenditures |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | 6
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 |  |  |  | 6
Individuals' loans for household and other personal expenditures | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Modification |  |  |  | $ 0

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