Loans - Aging Analysis of Past Due and Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	$ 19,806	$ 12,973
Loans receivable, nonaccrual status	7,274	6,873
Loan receivable, current	1,293,188	1,291,593
Total loans held for investment	1,285,178	1,280,422
Total loans	1,304,984	1,293,395
SBA loans held for sale	8,010	11,171
Total loans	1,312,994	1,304,566
30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	9,889	4,798
60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	2,604	1,204
90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	39	98
SBA loans held for investment
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	2,463	1,560
Loans receivable, nonaccrual status	814	1,560
Loan receivable, current	36,352	37,773
Total loans	38,815	39,333
SBA loans held for investment \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	1,649	0
SBA loans held for investment \| 60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	0
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, past due	219	0
Loans receivable, nonaccrual status	0	0
Loan receivable, current	26,910	29,155
Total loans	27,129	29,155
SBA 504 loans \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	219	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	702,235	694,102
Commercial loans \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	222	30
Loans receivable, nonaccrual status	0	30
Loan receivable, current	98,553	104,557
Total loans	98,775	104,587
Commercial loans \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	3,501	1,347
Loans receivable, nonaccrual status	1,046	1,046
Loan receivable, current	519,010	509,023
Total loans	522,511	510,370
Commercial loans \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	39	0
Loans receivable, nonaccrual status	0	0
Loan receivable, current	53,781	49,990
Total loans	53,820	49,990
Commercial loans \| 30-59 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	222	0
Commercial loans \| 30-59 days past due \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	1,140	301
Commercial loans \| 30-59 days past due \| Commercial real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	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	1,315	0
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	39	0
Residential mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	12,958	9,314
Loans receivable, nonaccrual status	5,243	4,211
Loan receivable, current	425,473	426,742
Total loans	438,431	436,056
Residential mortgage loans \| 30-59 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	6,474	3,801
Residential mortgage loans \| 60-89 days past due
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	1,241	1,204
Residential mortgage loans \| 90 days and still accruing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	98
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	125,503	123,904
Consumer loans \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	300
Loans receivable, nonaccrual status	0	0
Loan receivable, current	64,558	63,717
Total loans	64,558	64,017
Consumer loans \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	404	422
Loans receivable, nonaccrual status	171	26
Loan receivable, current	60,541	59,465
Total loans	60,945	59,887
Consumer loans \| 30-59 days past due \| Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	0	300
Consumer loans \| 30-59 days past due \| Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, past due	185	396
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	48	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
Collateral Pledged \| Small Business Administration
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, nonaccrual status	$ 68	$ 89

Financing receivables that are current.

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