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Premises and Equipment - Additional information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number Of Lessee Lease Agreements   15
Initial Leases And Lease Modifications And Renewals   $ 9,500,000
Lease expense related to ATMs $ 275,000 $ 286,000
Weighted-average lease term   P8Y3M18D
Operating Lease, Weighted Average Discount Rate, Percent 3.24%  
Operating Lease, Expense $ 1,600,000 $ 1,500,000
Operating leases right of use asset 8,536,000 8,668,000
Lease liability 8,661,000 8,747,000
Income Recognized From Lessor Agreements $ 1,200,000 $ 1,100,000
Minimum    
Lessee Expected Lease Terms   P0Y9M18D
Maximum    
Lessee Expected Lease Terms   P17Y10M24D