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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2009
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Long-term debt   $ 100,929 $ 100,929
Partnership total assets   8,000 $ 8,200
Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Long-term debt   30,900  
Equity method investments   $ 900  
Liberty Mews Limited Partnership [Member]      
Variable Interest Entity [Line Items]      
Ownership in Liberty Mews Limited Partnership   99.90%  
Subsidiaries [Member]      
Variable Interest Entity [Line Items]      
Equity method investments $ 6,100    
VIE financing 10,600    
Purchase of land for low income housing by Liberty Mews $ 10,600    
Federal investment tax credits   $ 8,400  
Federal investment tax credit duration   10 years  
Subsidiaries [Member] | Liberty Mews Limited Partnership [Member]      
Variable Interest Entity [Line Items]      
Ownership in Liberty Mews Limited Partnership 99.99%    
Liberty Mews Limited Partnership [Member]      
Variable Interest Entity [Line Items]      
Equity method investments   $ 6,100  
Impact of tax credits on total tax expense   $ (800)