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Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Pre-Modification Recorded Balance | $ 195 | $ 219 | $ 456 | $ 578
Post-Modification Recorded Balance | $ 185 | $ 205 | $ 439 | $ 576
Number of Loans | loan | 3 | 5 | 8 | 15
Residential |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Pre-Modification Recorded Balance | $ 195 | $ 154 | $ 456 | $ 490
Post-Modification Recorded Balance | $ 185 | $ 140 | $ 439 | $ 487
Number of Loans | loan | 3 | 4 | 8 | 11
Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Pre-Modification Recorded Balance |  | $ 65 |  | $ 81
Post-Modification Recorded Balance |  | $ 65 |  | $ 81
Number of Loans | loan |  | 1 |  | 3
Individuals' loans for household and other personal expenditures |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Pre-Modification Recorded Balance |  |  |  | $ 7
Post-Modification Recorded Balance |  |  |  | $ 8
Number of Loans | loan |  |  |  | 1

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