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Leases (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
branch_office
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term 20 years 4 months 24 days    
Weighted average discount rate 3.29%    
Operating right-of-use lease assets $ 19,669    
Lease liabilities 19,855    
Total operating lease expense $ 2,600    
Total operating lease expense   $ 2,300 $ 2,300
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 9    
Land      
Lessee, Lease, Description [Line Items]      
Number of branch locations | branch_office 8