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Loans And Leases (Narrative) (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
loan
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]      
Loans $ 422,495,000   $ 406,406,000
Cash payments of interest 50,000 $ 56,000  
Loans 90 days or more past due and still accruing interest  
Number of days of default payment 90 days    
Total TDR's $ 3,301,000   3,386,000
Allocated specific reserves to modified TDRs 26,000   25,000
Commitment to lend additional amounts $ 0   0
Number of TDRs in payment default | loan 0    
Recorded investment of loans undergoing modifications, not TDRs $ 22,359,000 $ 12,915,000  
Accruing TDR's 3,190,000   3,271,000
Loans And Leases Receivable Net Of Deferred Income 429,471,000   413,376,000
Doubtful [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans And Leases Receivable Net Of Deferred Income $ 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    
Percent of participation agreement interest 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 $ 99,409,000   95,578,000
Single-Family Residential [Member] | Northpointe [Member] | Mortgage Purchase Program Member [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans 28,284,000   37,665,000
Commercial [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans And Leases Receivable Net Of Deferred Income [1] $ 100,732,000   $ 101,975,000
[1] Includes $5,859 and $6,008 of commercial leases at March 31, 2018 and December 31, 2017, respectively.