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Leases - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
branch_office
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term 19 years 4 months 24 days    
Weighted average discount rate (as a percent) 2.87%    
Operating right-of-use lease assets $ 20,719 $ 17,514  
Lease liabilities 21,192 17,868  
Total operating lease expense $ 2,600 $ 2,900  
Total operating lease expense, rent     $ 2,600
Minimum      
Lessee, Lease, Description [Line Items]      
Option extension period 5 years    
Maximum      
Lessee, Lease, Description [Line Items]      
Option extension period 10 years    
Land and Building      
Lessee, Lease, Description [Line Items]      
Number of branch locations | branch_office 17    
Land      
Lessee, Lease, Description [Line Items]      
Number of branch locations | branch_office 10