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Commitments and Contingencies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Apartment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]      
Number of apartments under the project | Apartment 37    
Limited partner capital contribution commitment $ 7,579,000    
Project investment amortization period 10 years    
Annual LIHTCs mount awarded for the project $ 861,000    
Total anticipated LIHTCs amount under the housing project 8,613,000    
Total investment in limited partnership   $ 233,000 $ 277,000
Minimum net assets qualified for small banks assessment credits   10,000,000,000  
Total assessment credit   $ 492,000  
Minimum [Member]      
Other Commitments [Line Items]      
Small bank growth reserve ratio   1.15%  
Reserve ratio for assessment credits to be contingent   1.38%  
Maximum [Member]      
Other Commitments [Line Items]      
Small bank growth reserve ratio   1.35%  
Other Assets [Member]      
Other Commitments [Line Items]      
Total investment in limited partnership $ 1,710,000 $ 1,710,000