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Allowance for Loan Losses and Reserve for Unfunded Loan Commitments - Allowance for Credit Losses on Financing Receivables on Basis of Impairment Method (Details) - USD ($)
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Total $ 13,113,000 $ 12,800,000 $ 12,579,000 $ 12,685,000 $ 12,758,000 $ 12,759,000
Total loans 1,075,149,000   958,641,000      
SBA loans held for investment            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 289,000   246,000      
Collectively evaluated for impairment 1,335,000   1,330,000      
Total 1,624,000 1,514,000 1,576,000 1,635,000 1,630,000 1,961,000
Individually evaluated for impairment 539,000   1,108,000      
Collectively evaluated for impairment 43,462,000   41,384,000      
Total loans 44,001,000   42,492,000      
SBA 504 loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 451,000   573,000      
Total 451,000 494,000 573,000 567,000 588,000 741,000
Individually evaluated for impairment 0   513,000      
Collectively evaluated for impairment 22,239,000   25,831,000      
Total loans 22,239,000   26,344,000      
Commercial loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   34,000      
Collectively evaluated for impairment 7,003,000   6,695,000      
Total 7,003,000 6,893,000 6,729,000 6,812,000 6,566,000 6,309,000
Individually evaluated for impairment 68,000   426,000      
Collectively evaluated for impairment 568,698,000   508,745,000      
Total loans 568,766,000   509,171,000      
Residential mortgage loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 2,894,000   2,593,000      
Total 2,894,000 2,816,000 2,593,000 2,516,000 2,964,000 2,769,000
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 330,787,000   289,093,000      
Total loans 330,787,000   289,093,000      
Consumer loans            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 1,141,000   925,000      
Total 1,141,000 1,083,000 925,000 892,000 861,000 817,000
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 109,356,000   91,541,000      
Total loans 109,356,000   91,541,000      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   183,000      
Total 0 $ 0 183,000 $ 263,000 $ 149,000 $ 162,000
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Total loans 0   0      
Total            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 289,000   280,000      
Collectively evaluated for impairment 12,824,000   12,299,000      
Total 13,113,000   12,579,000      
Individually evaluated for impairment 607,000   2,047,000      
Collectively evaluated for impairment 1,074,542,000   956,594,000      
Total loans $ 1,075,149,000   $ 958,641,000