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Borrowings (Subordinated Debentures) (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 08, 2015
Apr. 30, 2006
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2006
Dec. 31, 2008
Debt Instrument [Line Items]              
Subordinated Debt $ 15,000,000   $ 59,080,000 $ 59,067,000      
Subordinated Borrowing, Interest Rate 5.50%            
Debt Instrument, Term     10 years        
Debt Instrument, Frequency of Periodic Payment     semi-annually        
Debt Instrument, Maturity Date     Oct. 15, 2020        
Debt Instrument, Call Date, Earliest     Oct. 15, 2025        
Debt Issuance Cost     $ 115,000 54,000      
Value Of Trust Preferred Securities Included In Tier 1 Capital $ 43,000,000   43,000,000 43,000,000      
Interest Expense, Junior Subordinated Debentures     3,266,000 $ 3,415,000 $ 3,408,000    
Junior Subordinated Debt              
Debt Instrument [Line Items]              
Value Of Trust Preferred Securities Included In Tier 1 Capital     $ 43,000,000        
Percentage of trust preferred securities included in Tier I Capital ratio     10.30%        
Junior Subordinated Debt | Subsidiary One [Member]              
Debt Instrument [Line Items]              
Proceeds from issuance of trust preferred securities   $ 36,100,000          
Value of outstanding common shares of subsidiary owned by company   $ 1,100,000          
Debt Instrument, Interest Rate, Stated Percentage     3.36% 4.20%      
Debt Instrument, Interest Rate Terms   The contract interest rate of the trust preferred securities is three-month LIBOR plus 140 basis points.          
Debt interest rate, additional rate over three month LIBOR   1.40%          
Junior Subordinated Debt | Subsidiary Two [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Term           30 years  
Value of outstanding common shares of subsidiary owned by company           $ 248,000  
Debt Instrument, Interest Rate, Stated Percentage     3.41% 3.86%      
Debt Instrument, Interest Rate Terms           The contract interest rate of the trust preferred securities is the average three-month LIBOR plus 1.42%.  
Trust preferred securities assumed in acquisition             $ 8,000,000
Debt interest rate, additional rate over three month LIBOR           1.42%  
Aggregate amount of junior subordinated debt issued to subsidiary by acquired company, prior to acquisition           $ 8,200,000  
Debt instrument fixed rate           6.4725%  
interest rate multiplier applied to variable rate           50.00%  
interest rate multiplier applied to fixed rate           50.00%  
Interest rate swaps              
Debt Instrument [Line Items]              
Notional amount of derivative     $ 43,000,000 $ 43,000,000