| Goodwill and Other Intangibles - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | |
|---|---|---|
| Mar. 31, 2020 | Dec. 31, 2019 | |
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Accumulated amortization | $ (1,919) | $ (1,854) | 
| Goodwill | 11,031 | 11,031 | 
| Gross carrying amount | 13,727 | 13,727 | 
| Net carrying amount | $ 11,808 | 11,873 | 
| Core deposit intangible | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization Period | 10 years | |
| Gross carrying amount, excluding goodwill | $ 2,213 | 2,213 | 
| Accumulated amortization | (1,612) | (1,567) | 
| Net carrying amount, excluding goodwill | $ 601 | 646 | 
| Third-party originators intangible | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Amortization Period | 7 years | |
| Gross carrying amount, excluding goodwill | $ 483 | 483 | 
| Accumulated amortization | (307) | (287) | 
| Net carrying amount, excluding goodwill | $ 176 | $ 196 | 
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- Definition Intangible Assets, Gross, Including Goodwill No definition available. 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available. 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. No definition available. 
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