Quarterly report pursuant to Section 13 or 15(d)

Allowance for Loan and Lease Losses - Summary of Loans by Key Indicators of Credit Quality (Details)

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Allowance for Loan and Lease Losses - Summary of Loans by Key Indicators of Credit Quality (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 882,101 $ 869,119
Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 861,183 847,754
Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans 7,799 10,701
Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 13,119 10,664
Commercial and Industrial Loans    
Financing Receivable Recorded Investment [Line Items]    
Total loans 137,400 135,040
Commercial and Industrial Loans | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 131,535 129,288
Commercial and Industrial Loans | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans 2,270 2,331
Commercial and Industrial Loans | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,595 3,421
Real Estate | 1-4 Single Family Residential Loans    
Financing Receivable Recorded Investment [Line Items]    
Total loans 238,382 232,510
Real Estate | 1-4 Single Family Residential Loans | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 233,216 228,450
Real Estate | 1-4 Single Family Residential Loans | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans 935 1,090
Real Estate | 1-4 Single Family Residential Loans | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,231 2,970
Real Estate | Construction, Land and Development    
Financing Receivable Recorded Investment [Line Items]    
Total loans 143,646 139,470
Real Estate | Construction, Land and Development | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 141,647 137,760
Real Estate | Construction, Land and Development | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans 94 1,403
Real Estate | Construction, Land and Development | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,905 307
Real Estate | Commercial Real Estate Loans (Including Multifamily)    
Financing Receivable Recorded Investment [Line Items]    
Total loans 289,571 285,731
Real Estate | Commercial Real Estate Loans (Including Multifamily) | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 281,847 276,096
Real Estate | Commercial Real Estate Loans (Including Multifamily) | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,500 5,877
Real Estate | Commercial Real Estate Loans (Including Multifamily) | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,224 3,758
Consumer Loans and Leases    
Financing Receivable Recorded Investment [Line Items]    
Total loans 20,824 22,736
Consumer Loans and Leases | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans 20,660 22,528
Consumer Loans and Leases | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans 164 208
Municipal and Other Loans    
Financing Receivable Recorded Investment [Line Items]    
Total loans 52,278 53,632
Municipal and Other Loans | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 52,278 $ 53,632