Loans - Aging Analysis of Past Due and Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	$ 18,580	$ 17,517
Loans receivable, nonaccrual status	9,655	5,649
Loan receivable, current	1,421,065	1,408,041
Total loans held for investment	1,410,339	1,394,512
Total loans	1,428,919	1,412,029
SBA loans held for sale	10,726	13,529
Total loans	1,439,645	1,425,558
30-59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	7,923	7,163
60-89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	1,002	3,775
90 days and still accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	930
SBA loans held for investment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	1,912	2,212
Loans receivable, nonaccrual status	1,627	1,164
Loan receivable, current	35,162	33,555
Total loans	37,074	35,767
SBA loans held for investment \| 30-59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	131	1,048
SBA loans held for investment \| 60-89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	154	0
SBA loans held for investment \| 90 days and still accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
SBA 504 loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	1,808
Loans receivable, nonaccrual status	0	0
Loan receivable, current	25,185	24,918
Total loans	25,185	26,726
SBA 504 loans \| 30-59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
SBA 504 loans \| 60-89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	1,808
SBA 504 loans \| 90 days and still accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	786,078	765,032
Commercial loans \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	637	387
Loans receivable, nonaccrual status	0	316
Loan receivable, current	119,392	111,627
Total loans	120,029	112,014
Commercial loans \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	1,473	428
Loans receivable, nonaccrual status	613	213
Loan receivable, current	584,863	578,215
Total loans	586,336	578,643
Commercial loans \| Commercial real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Loans receivable, nonaccrual status	0	0
Loan receivable, current	54,528	47,649
Total loans	54,528	47,649
Commercial loans \| 30-59 days past due \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	566	71
Commercial loans \| 30-59 days past due \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	785	215
Commercial loans \| 30-59 days past due \| Commercial real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 60-89 days past due \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	71	0
Commercial loans \| 60-89 days past due \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	75	0
Commercial loans \| 60-89 days past due \| Commercial real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Commercial loans \| 90 days and still accruing \| Commercial real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	13,163	10,925
Loans receivable, nonaccrual status	6,910	3,936
Loan receivable, current	442,909	456,781
Total loans	456,072	467,706
Residential mortgage loans \| 30-59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	5,880	4,383
Residential mortgage loans \| 60-89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	373	1,676
Residential mortgage loans \| 90 days and still accruing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	930
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	149,695	143,524
Consumer loans \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	133
Loans receivable, nonaccrual status	0	20
Loan receivable, current	74,455	73,802
Total loans	74,455	73,935
Consumer loans \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	1,395	1,624
Loans receivable, nonaccrual status	505	0
Loan receivable, current	73,845	67,965
Total loans	75,240	69,589
Consumer loans \| 30-59 days past due \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 30-59 days past due \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	561	1,446
Consumer loans \| 60-89 days past due \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	113
Consumer loans \| 60-89 days past due \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	329	178
Consumer loans \| 90 days and still accruing \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Consumer loans \| 90 days and still accruing \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, past due	0	0
Collateral Pledged \| Small Business Administration
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable, nonaccrual status	$ 427	$ 59

Amount of financing receivable not past due.

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