v3.19.1
Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) $ 1,338,682 $ 1,189,999
Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 1,328,146 1,177,695
Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 3,671 7,303
Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 6,865 5,001
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 1,091,487 985,448
Real Estate | Commercial property    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 709,409 662,031
Real Estate | Commercial property | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 708,742 656,711
Real Estate | Commercial property | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 4,812
Real Estate | Commercial property | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 667 508
Real Estate | Commercial property | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate | Residential property    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 233,816 168,560
Real Estate | Residential property | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 233,514 167,830
Real Estate | Residential property | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate | Residential property | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 302 730
Real Estate | Residential property | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate | SBA loan pool securities    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 120,939 131,740
Real Estate | SBA loan pool securities | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 115,543 126,069
Real Estate | SBA loan pool securities | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 74 2,487
Real Estate | SBA loan pool securities | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 5,322 3,184
Real Estate | SBA loan pool securities | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate | Construction    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 27,323 23,117
Real Estate | Construction | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 24,325 23,117
Real Estate | Construction | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 2,998 0
Real Estate | Construction | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Real Estate | Construction | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 221,274 170,529
Commercial and Industrial | Commercial term    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 102,133 77,402
Commercial and Industrial | Commercial term | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 102,106 77,227
Commercial and Industrial | Commercial term | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | Commercial term | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 27 175
Commercial and Industrial | Commercial term | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | Commercial lines of credit    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 80,473 60,822
Commercial and Industrial | Commercial lines of credit | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 79,874 60,812
Commercial and Industrial | Commercial lines of credit | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 599 0
Commercial and Industrial | Commercial lines of credit | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 10
Commercial and Industrial | Commercial lines of credit | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | SBA commercial term    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 27,147 30,376
Commercial and Industrial | SBA commercial term | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 26,616 30,003
Commercial and Industrial | SBA commercial term | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 4
Commercial and Industrial | SBA commercial term | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 531 369
Commercial and Industrial | SBA commercial term | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | Trade finance    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 11,521 1,929
Commercial and Industrial | Trade finance | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 11,521 1,929
Commercial and Industrial | Trade finance | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | Trade finance | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Commercial and Industrial | Trade finance | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 25,921 34,022
Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 25,905 33,997
Consumer | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 0 0
Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) 16 25
Consumer | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Loans held-for-investment, net of deferred loan costs (fees) $ 0 $ 0