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Borrowed Funds (Subordinated Debentures Owed to Unconsolidated Subsidiary Trusts) (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2005
USD ($)
Mar. 31, 2004
USD ($)
Oct. 31, 2002
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2020
Dec. 31, 2021
USD ($)
trust
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Number of Statutory Business Trusts | trust           3    
Subordinated debentures owed to unconsolidated subsidiary trusts       $ 19,589,000   $ 19,589,000 $ 19,589,000  
Ownership percentage       100.00%   100.00%    
Proceeds from issuance of common stock, net of issuance costs           $ 294,000 $ 178,000 $ 159,000
Basis spread on variable rate       230.00% 487.00%      
Trust preferred securities limited to tier one capital elements, Nnt of goodwill           25.00%    
Sfg Capital Trust I [Member]                
Debt Instrument [Line Items]                
Proceeds from issuance or sale of equity     $ 3,500,000          
Proceeds from issuance of common stock, net of issuance costs     109,000          
Payments to acquire investments     $ 3,610,000          
Basis spread on variable rate     345.00%          
Sfg Capital Trust Ii [Member]                
Debt Instrument [Line Items]                
Proceeds from issuance or sale of equity   $ 7,500,000            
Proceeds from issuance of common stock, net of issuance costs   232,000            
Payments to acquire investments   $ 7,730,000            
Basis spread on variable rate   280.00%            
Sfg Capital Trust Iii [Member]                
Debt Instrument [Line Items]                
Proceeds from issuance or sale of equity $ 8,000,000              
Proceeds from issuance of common stock, net of issuance costs 248,000              
Payments to acquire investments $ 8,250,000              
Basis spread on variable rate 145.00%