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Leases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
agreement
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Lease cost      
Operating lease cost $ 1,681    
Short-term lease cost 128    
Variable lease cost 43    
Total lease cost 1,852    
Cash paid for lease liabilities $ 1,720    
Weighted average remaining lease term 3 years    
Weighted average discount rate 3.20%    
Right-of-use assets $ 2,780    
Right-of-use assets, line item in Statement of Financial Position us-gaap:OtherAssets    
Lease liabilities $ 2,813    
Lease liabilities, line item in Statement of Financial Position us-gaap:OtherLiabilities    
Right-of-use assets obtained in exchange for lease liabilities $ 1,140    
Lease expense recognized   $ 1,680 $ 1,770
Maturities of lease liabilities      
2020 1,385    
2021 906    
2022 292    
2023 128    
2024 104    
Thereafter 121    
Total 2,936    
Imputed interest (123)    
Lease liabilities 2,813    
Payments related to lease agreements that the Corporation has not obtained control of the real estate properties $ 7,920    
Number of lease agreements that the Corporation has not obtained control of the real estate properties | agreement 2