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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) lease | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Short-term lease expense | $ 164 | $ 139 | $ 136
Variable lease payments | 1,100 | 1,100 | 1,000
Operating lease cost | $ 8,689 | $ 7,725 | 7,575
Weighted-average remaining lease term-operating leases (Year) | 7 years 4 months 24 days | 8 years 3 months 18 days |
Weighted average discount rate-operating leases | 3.10% | 3.20% |
Minimum [Member] |  |  |
Term of contract | 1 month |  |
Maximum [Member] |  |  |
Term of contract | 15 years |  |
Branches And Office Space [Member] |  |  |
Number of leases | lease | 28 |  |
Vehicles [Member] |  |  |
Number of leases | lease | 10 |  |
Equipment [Member] |  |  |
Number of leases | lease | 1 |  |
Building and Equipment [Member] |  |  |
Operating lease cost | $ 8,600 | $ 7,700 | 7,600
Other Operation Expenses [Member] |  |  |
Operating lease cost | $ 100 | $ 100 | $ 100

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: 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=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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