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Servicing Rights - Key Assumptions and the Sensitivity of the Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Servicing Assets at Fair Value [Line Items] |  |  |  |
Aggregate portfolio principal balance | $ 772,764 | $ 683,117 |  |
Base |  |  |  |
MSR as a percentage of serviced loans | 1.78% | 1.64% |  |
Mortgage servicing rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Aggregate portfolio principal balance | $ 772,764 | $ 683,117 |  |
Weighted average rate of note | 3.31% | 3.62% |  |
Base |  |  |  |
Constant prepayment rate | 11.80% | 13.05% |  |
Average discount rate | 8.00% | 7.75% |  |
Mortgage servicing rights, at fair value | $ 13,724 | $ 11,218 | $ 11,920 | $ 10,821
MSR as a percentage of serviced loans | 1.78% | 1.64% |  |
1.0% Adverse Rate Change |  |  |  |
Constant prepayment rate | 23.59% | 26.11% |  |
Discount rate | 7.00% | 6.75% |  |
Fair value MSR | $ 9,612 | $ 7,455 |  |
Percentage of MSR | 1.24% | 1.09% |  |
2.0% Adverse Rate Change |  |  |  |
Constant prepayment rate | 34.57% | 38.97% |  |
Discount rate | 6.00% | 5.75% |  |
Fair value MSR | $ 7,256 | $ 5,404 |  |
Percentage of MSR | 0.94% | 0.79% |  |

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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