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Loan Servicing - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Servicing assets | $ 17,083 | $ 17,370 |
Servicing fees net of servicing asset amortization | 3,383 | 850 | $ 722
Mortgage Loans |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Servicing assets | $ 15,100 | $ 15,300 |
Mortgage Loans | Fair Value Discount Rate |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 10.82 | 10.59 |
Mortgage Loans | Fair Value Prepayment Rate | Minimum |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 7.27 | 8.26 |
Mortgage Loans | Fair Value Prepayment Rate | Maximum |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 20.15 | 16.82 |
Mortgage Loans | Fair Value Weighted Average Default Rate |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 0.11 | 0.20 |
SBA Loans |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Servicing assets | $ 5,600 | $ 6,100 |
SBA Loans | Fair Value Discount Rate |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 8.50 | 8.50 |
SBA Loans | Fair Value Prepayment Rate | Minimum |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 12.50 | 11.43 |
SBA Loans | Fair Value Prepayment Rate | Maximum |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 14.66 | 12.11 |
SBA Loans | Fair Value Weighted Average Default Rate |  |  |
Loan Sales And Mortgage Servicing Rights [Line Items] |  |  |
Fair value of servicing assets percentage | 0.43 | 0.52 |

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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