v3.19.1
Loans and Allowance for Loan Losses - Loans Held-For-Investment (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) $ 1,338,682,000 $ 1,189,999,000    
Allowance for loan losses (13,167,000) (12,224,000) $ (11,320,000) $ (9,345,000)
Net loans held-for-investment 1,325,515,000 1,177,775,000    
Loans receivable from related parties 2,400,000 0    
Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 1,091,487,000 985,448,000    
Allowance for loan losses (9,104,000) (8,507,000) (7,497,000) (4,974,000)
Real Estate | Commercial property        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 709,409,000 662,031,000    
Real Estate | Residential property        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 233,816,000 168,560,000    
Real Estate | SBA loan pool securities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 120,939,000 131,740,000    
Real Estate | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 27,323,000 23,117,000    
Commercial and Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 221,274,000 170,529,000    
Allowance for loan losses (3,877,000) (3,548,000) (3,657,000) (4,152,000)
Commercial and Industrial | Commercial term        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 102,133,000 77,402,000    
Commercial and Industrial | Commercial lines of credit        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 80,473,000 60,822,000    
Commercial and Industrial | SBA commercial term        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 27,147,000 30,376,000    
Commercial and Industrial | Trade finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 11,521,000 1,929,000    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held-for-investment, net of deferred loan costs (fees) 25,921,000 34,022,000    
Allowance for loan losses $ (186,000) $ (169,000) $ (166,000) $ (219,000)