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Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross $ 124,592 $ 122,243  
Less accumulated depreciation and amortization (79,301) (75,925)  
Premises and equipment, net 45,291 46,318  
Depreciation and amortization of premises and equipment 3,800 3,900 $ 3,700
Land and Buildings [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 79,815 79,173  
Leasehold Improvements [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 4,805 4,894  
Furniture, Fixtures, and Equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross 38,576 38,096  
Construction in Progress [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Premises and equipment, gross $ 1,396 $ 80