Quarterly report pursuant to Section 13 or 15(d)

Allowance for Loan and Lease Losses - Changes in Allowance for Loan and Lease Losses by Loan Portfolio and Segment (Details)

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Allowance for Loan and Lease Losses - Changes in Allowance for Loan and Lease Losses by Loan Portfolio and Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance $ 5,652 $ 4,357
Charge-offs (330) (357)
Recoveries 66  
Provision 339 550
Ending Balance 5,727 4,550
Commercial and Industrial Loans    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 3,046 2,347
Charge-offs (324) (260)
Recoveries 66  
Provision 118 364
Ending Balance 2,906 2,451
Real Estate | 1-4 Single Family Residential Loans    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 902 647
Provision (15) 29
Ending Balance 887 676
Real Estate | Construction, Land and Development Loans    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 441 364
Provision 99 16
Ending Balance 540 380
Real Estate | Commercial Real Estate Loans (Including Multifamily)    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 898 667
Charge-offs   (15)
Provision 134 45
Ending Balance 1,032 697
Consumer Loans and Leases    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 198 186
Charge-offs (6) (82)
Provision (17) 90
Ending Balance 175 194
Municipal and Other Loans    
Loans And Leases Receivable Disclosure [Line Items]    
Beginning Balance 167 146
Provision 20 6
Ending Balance $ 187 $ 152