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Premises and Equipment - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property Plant And Equipment [Abstract] |  |  |  |
Depreciation and leasehold amortization expense |  | $ 1,800,000 | $ 989,000 | $ 686,000
Operating leases expire at various dates through year | 2028 |  |  |
Total rental expense, recognized on straight-line basis | $ 6,100,000 | $ 2,700,000 | $ 1,500,000 |
Operating lease expiration date | 2018-05 |  |  |
Sub-lease income | $ 197,000 |  |  |

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- Definition Depreciation and leasehold amortization excluding intangibles amortization. + References No definition available. + Details
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- Definition Operating lease expiration date. + References No definition available. + Details
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- Definition Operating leases expiration various dates through year. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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