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Fair Value Disclosures - Additional Information (Details) - USD ($) | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Jun. 02, 2018 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Held to maturity securities, Fair Value | $ 7,326,000 | $ 7,326,000 |  | $ 7,527,000
Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Held to maturity securities, Fair Value | 7,326,000 | $ 7,326,000 |  | 7,527,000
Level 3 | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Selling and closing costs for loans as a percentage of appraised value |  | 5.00% |  |
Real estate selling and closing costs as a percentage of appraised value |  | 5.00% |  |
Level 3 | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Selling and closing costs for loans as a percentage of appraised value |  | 8.00% |  |
Real estate selling and closing costs as a percentage of appraised value |  | 8.00% |  |
Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Held to maturity securities, Fair Value |  |  |  | 0
Interstate Capital Corporation |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Disposals of contingent consideration |  | $ 0 |  |
Contingent consideration earnout period |  | 30 months |  |
Interstate Capital Corporation | Minimum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration recorded at fair value |  |  | $ 0 |
Interstate Capital Corporation | Maximum |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration recorded at fair value |  |  | 22,000,000 |
Interstate Capital Corporation | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration recorded at fair value | 20,745,000 | $ 20,745,000 | $ 20,000,000 |
Contingent consideration increase in fair value | 745,000 |  |  |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value disclosure |  |  |  | 0
Fair Value, Measurements, Nonrecurring |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value disclosure | $ 0 | $ 0 |  | $ 0

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