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Premises and Equipment Premises and Equipment (Additional Information) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]      
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 37,378,000 $ 34,201,000  
Gain (Loss) on Disposition of Property Plant Equipment (34,000) 0 $ 0
Operating Leases, Rent Expense $ 1,500,000 1,500,000 1,800,000
Number of properties | property 2    
Capital Leases, Income Statement, Amortization Expense $ 46,000 37,000 39,000
Capital Lease Obligations 1,600,000 791,000  
Capital Leases, Income Statement, Interest Expense $ 40,000 45,000 $ 47,000
Lessee, Operating Lease, Term of Contract 5 years    
number of lease extensions 2    
Lessee, Operating Lease, Renewal Term 5 years    
Software and Software Development Costs [Member]      
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Gross $ 4,000,000 3,800,000  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 3,700,000 3,500,000  
Capital Lease Obligations [Member]      
Property, Plant and Equipment [Line Items]      
Capital Leased Assets, Gross 1,700,000 855,000  
Property, Plant and Equipment, Other, Accumulated Depreciation $ 552,000 $ 502,000  
Lease Agreements [Member]      
Property, Plant and Equipment [Line Items]      
Lease Expiration Date Dec. 01, 2019    
Officer [Member]      
Property, Plant and Equipment [Line Items]      
number of related parties 2