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Recent Accounting Pronouncements (Narrative) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Lease
Location
Dec. 31, 2017
USD ($)
ASU 2017-07 | Salaries and Employee Benefits [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Service cost $ 287,000    
ASU 2017-07 | Other Income [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Net benefit costs 768,000    
ASU 2017-07 | Other Expense [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Net benefit costs $ 93,000    
ASU 2016-02 [Member] | Subsequent Event [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
ROU asset   $ 11,661,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   us-gaap:OtherAssetsMember  
Lease liability   $ 12,866,000  
Operating Lease, Liability, Statement of Financial Position [Extensible List]   us-gaap:OtherLiabilitiesMember  
Opening adjustment to retaining earnings   $ 316,000  
Number of retail branch locations which deferred sale/lease back gain recorded | Location   2  
Number of leased properties | Lease   24  
ASU 2016-01 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
One-time cumulative-effect adjustment based upon adoption     $ (9,000)
ASU 2016-01 [Member] | Deferred Tax Assets [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
One-time cumulative-effect adjustment based upon adoption     (9,000)
ASU 2016-01 [Member] | Retained Earnings [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
One-time cumulative-effect adjustment based upon adoption     (44,000)
ASU 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
One-time cumulative-effect adjustment based upon adoption     $ 35,000