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Loans And Leases (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Loans $ 493,529,000   $ 493,529,000   $ 406,406,000
Cash payments of interest 52,000 $ 52,000 151,000 $ 164,000  
Loans 90 days or more past due and still accruing interest    
Number of days of default payment     90 days    
Total TDR's 3,266,000   $ 3,266,000   3,386,000
Allocated specific reserves to modified TDRs 24,000   24,000   26,000
Commitment to lend additional amounts $ 0   $ 0   0
Number of loans modified as a TDR | loan 0 0 0 1  
Loans modified as TDR, amount       $ 841,000  
Number of TDRs in payment default | loan     0 0  
Recorded investment of loans undergoing modifications, not TDRs $ 10,210,000 $ 10,843,000 $ 10,210,000 $ 10,843,000  
Accruing TDR's 3,163,000   3,163,000   3,271,000
Loans And Leases Receivable Net Of Deferred Income 500,534,000   500,534,000   413,376,000
Doubtful [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans And Leases Receivable Net Of Deferred Income 0   $ 0   0
Northpointe [Member] | Mortgage Purchase Program Member [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Percent of loans risk rated for capital adequacy     100.00%    
Mortgage allowance $ 0   $ 0    
Percent of participation agreement interest 95.00%   95.00%    
Ownership interest in each loan it participates     5.00%    
Single-Family Residential [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans And Leases Receivable Net Of Deferred Income $ 93,982,000   $ 93,982,000   95,578,000
Single-Family Residential [Member] | Northpointe [Member] | Mortgage Purchase Program Member [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans 134,000   134,000   37,665,000
Commercial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans And Leases Receivable Net Of Deferred Income $ 131,176,000   $ 131,176,000   $ 101,975,000