Loans - Aging Analysis of Past Due and Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	$ 7,758	$ 7,237
Loans receivable, past due	14,683	13,279
Loan receivable, current	985,994	960,135
Total loans held for investment	973,831	945,362
Total loans	988,514	958,641
SBA loans held for sale	12,163	14,773
Total loans	1,000,677	973,414
Troubled Debt Restructuring (TDR) \| Non Accrual
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status		153
30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	3,025	4,808
60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	3,900	1,234
90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
SBA loans held for investment
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	1,239	1,168
Loans receivable, past due	1,520	2,056
Loan receivable, current	40,883	40,436
Total loans	42,403	42,492
SBA loans held for investment \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	281	491
SBA loans held for investment \| 60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	397
SBA loans held for investment \| 90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
SBA 504 loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	237	513
Loans receivable, past due	237	513
Loan receivable, current	24,874	25,831
Total loans	25,111	26,344
SBA 504 loans \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
SBA 504 loans \| 60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
SBA 504 loans \| 90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	519,338	509,171
Commercial loans \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	25	25
Loans receivable, past due	95	75
Loan receivable, current	60,286	58,372
Total loans	60,381	58,447
Commercial loans \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	1,474	401
Loans receivable, past due	3,520	2,083
Loan receivable, current	422,061	420,335
Total loans	425,581	422,418
Commercial loans \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	0	0
Loans receivable, past due	28	0
Loan receivable, current	33,348	28,306
Total loans	33,376	28,306
Commercial loans \| 30-59 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	70	50
Commercial loans \| 30-59 days past due \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	1,108
Commercial loans \| 30-59 days past due \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	28	0
Commercial loans \| 60-89 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 60-89 days past due \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	2,046	574
Commercial loans \| 60-89 days past due \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Residential mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	2,514	2,672
Loans receivable, past due	6,529	5,867
Loan receivable, current	299,049	283,226
Total loans	305,578	289,093
Residential mortgage loans \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	2,161	2,932
Residential mortgage loans \| 60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	1,854	263
Residential mortgage loans \| 90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	96,084	91,541
Consumer loans \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	1,975	1,976
Loans receivable, past due	1,975	1,976
Loan receivable, current	44,814	42,154
Total loans	46,789	44,130
Consumer loans \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	294	482
Loans receivable, past due	779	709
Loan receivable, current	48,516	46,702
Total loans	49,295	47,411
Consumer loans \| 30-59 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 30-59 days past due \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	485	227
Consumer loans \| 60-89 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 60-89 days past due \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 90 days and still accruing \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 90 days and still accruing \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
Small Business Administration
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	$ 60	$ 60

Financing receivables that are current.

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