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Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 133,150 $ 135,587
Accumulated depreciation and amortization (64,258) (67,727)
Total Premises and Equipment, net 68,892 67,860
Land And Land Improvements    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 5,028 5,638
Land And Land Improvements | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 0 years  
Land And Land Improvements | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 0 years  
Building And Building Improvements    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 67,856 64,277
Building And Building Improvements | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 0 years  
Building And Building Improvements | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 40 years  
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 18,274 20,647
Leasehold Improvements | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 5 years  
Leasehold Improvements | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 10 years  
Furniture And Fixtures    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 17,137 16,242
Furniture And Fixtures | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 3 years  
Furniture And Fixtures | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 7 years  
Software And Software Development Costs    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Gross $ 24,855 $ 28,783
Software And Software Development Costs | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 3 years  
Software And Software Development Costs | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property Plant And Equipment Useful Life 7 years