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Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross $ 125,396 $ 124,592  
Less accumulated depreciation and amortization (81,350) (79,301)  
Premises and equipment, net 44,046 45,291  
Depreciation and amortization of premises and equipment 3,800 3,800 $ 3,900
Land and Buildings [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 80,552 79,815  
Leasehold Improvements [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 4,805 4,805  
Furniture, Fixtures, and Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 39,964 38,576  
Construction in Progress [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross $ 75 $ 1,396