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Loans - Impaired Loans with Associated Allowance Amount (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
Financing Receivable, Impaired [Line Items]    
Unpaid principal balance, with no related allowance $ 1,583 $ 203
Unpaid principal balance, with related allowance 1,743 1,534
Unpaid principal balance, total 3,326 1,737
Recorded investment, with no related allowance 1,577 120
Recorded investment, with related allowance 1,605 1,339
Recorded investment 3,182 1,459
Impaired financing receivable, related allowance 447 332
Loans receivable, nonaccrual status 6,195 2,994
Increase in impaired loans 1,600  
SBA loans held for investment    
Financing Receivable, Impaired [Line Items]    
Unpaid principal balance, with no related allowance 364 135
Unpaid principal balance, with related allowance 973 748
Unpaid principal balance, total 1,337 883
Recorded investment, with no related allowance 358 52
Recorded investment, with related allowance 835 553
Recorded investment 1,193 605
Impaired financing receivable, related allowance 325 194
Loans receivable, nonaccrual status 1,297 632
SBA 504 loans    
Financing Receivable, Impaired [Line Items]    
Loans receivable, nonaccrual status 0 0
Commercial loans    
Financing Receivable, Impaired [Line Items]    
Unpaid principal balance, with no related allowance 1,219 68
Unpaid principal balance, with related allowance 770 786
Unpaid principal balance, total 1,989 854
Recorded investment, with no related allowance 1,219 68
Recorded investment, with related allowance 770 786
Recorded investment 1,989 854
Impaired financing receivable, related allowance 122 138
Loans receivable, nonaccrual status $ 1,000  
Number of loans | loan 1  
Commercial loans | Other    
Financing Receivable, Impaired [Line Items]    
Unpaid principal balance, with no related allowance   25
Unpaid principal balance, with related allowance $ 15  
Unpaid principal balance, total 15 25
Recorded investment, with no related allowance   25
Recorded investment, with related allowance 15  
Recorded investment 15 25
Impaired financing receivable, related allowance 15 0
Loans receivable, nonaccrual status 15 25
Commercial loans | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Unpaid principal balance, with no related allowance 1,219 43
Unpaid principal balance, with related allowance 755 786
Unpaid principal balance, total 1,974 829
Recorded investment, with no related allowance 1,219 43
Recorded investment, with related allowance 755 786
Recorded investment 1,974 829
Impaired financing receivable, related allowance 107 138
Loans receivable, nonaccrual status 1,219 43
Commercial loans | Commercial real estate construction    
Financing Receivable, Impaired [Line Items]    
Loans receivable, nonaccrual status 0 $ 0
Small Business Administration    
Financing Receivable, Impaired [Line Items]    
Loans receivable, nonaccrual status $ 573  
Number of loans | loan 2