Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Impaired loans:
Total impaired loans	$ 1,914	$ 1,678
Total assets measured at fair value on a recurring basis	1,914	1,678
Total liabilities measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Total impaired loans	0	0
Total assets measured at fair value on a recurring basis	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2)
Impaired loans:
Total impaired loans	0	0
Total assets measured at fair value on a recurring basis	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3)
Impaired loans:
Total impaired loans	1,914	1,678
Total assets measured at fair value on a recurring basis	1,914	1,678
Total liabilities measured at fair value on a recurring basis	0	0
SBA property
Impaired loans:
Total impaired loans	261	116
SBA property | Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Total impaired loans	0	0
SBA property | Significant Other Observable Inputs (Level 2)
Impaired loans:
Total impaired loans	0	0
SBA property | Significant Unobservable Inputs (Level 3)
Impaired loans:
Total impaired loans	261	116
Commercial lines of credit
Impaired loans:
Total impaired loans	1,642	1,562
Commercial lines of credit | Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Total impaired loans	0	0
Commercial lines of credit | Significant Other Observable Inputs (Level 2)
Impaired loans:
Total impaired loans	0	0
Commercial lines of credit | Significant Unobservable Inputs (Level 3)
Impaired loans:
Total impaired loans	1,642	$ 1,562
SBA commercial term
Impaired loans:
Total impaired loans	11
SBA commercial term | Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Total impaired loans	0
SBA commercial term | Significant Other Observable Inputs (Level 2)
Impaired loans:
Total impaired loans	0
SBA commercial term | Significant Unobservable Inputs (Level 3)
Impaired loans:
Total impaired loans	$ 11