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Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) loan | Mar. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 90 | $ 237
Post-Modification Recorded Balance | $ 90 | $ 246
Number of Loans | loan | 1 | 8
Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance | $ 90 | $ 214
Post-Modification Recorded Balance | $ 90 | $ 222
Number of Loans | loan | 1 | 5
Home equity |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance |  | $ 16
Post-Modification Recorded Balance |  | $ 16
Number of Loans | loan |  | 2
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Modifications [Line Items] |  |
Pre-Modification Recorded Balance |  | $ 7
Post-Modification Recorded Balance |  | $ 8
Number of Loans | loan |  | 1

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