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Fair Value Measurements - Textual (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed assets and other real estate owned | $ 19,576,000 | $ 25,565,000
Impaired loan, related allowance | 5,279,000 | 684,000
Collateral dependent |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loan, related allowance | $ 1,297,000 | 2,738,000
Commercial Real Estate | Discount Rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input (as percent) | 10.00% |
Commercial Real Estate | Discount Rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input (as percent) | 40.00% |
Residential Real Estate | Discount Rate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input (as percent) | 10.00% |
Residential Real Estate | Discount Rate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement input (as percent) | 40.00% |
Foreclosed Assets Not Covered By FDIC Loss Share |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed assets and other real estate owned | $ 19,600,000 | 25,600,000
Ratings of Substandard or worse |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Threshold value for performing impairment testing on loans | 1,500,000 |
Residential Mortgage |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment of financing receivable, held-for-sale | $ 0 | $ 0

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