Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Securities available-for-sale:
Total securities available-for-sale	$ 128,049	$ 97,566
Residential mortgage-backed securities
Securities available-for-sale:
Total securities available-for-sale	73,158	38,738
Residential collateralized mortgage obligations
Securities available-for-sale:
Total securities available-for-sale	35,646	43,894
Municipal bonds
Securities available-for-sale:
Total securities available-for-sale	6,124	782
Recurring
Securities available-for-sale:
Total securities available-for-sale	128,049	97,566
Total assets measured at fair value on a recurring basis	128,049	97,566
Total liabilities measured at fair value on a recurring basis	0	0
Recurring | Residential mortgage-backed securities
Securities available-for-sale:
Total securities available-for-sale	73,158	38,738
Recurring | Residential collateralized mortgage obligations
Securities available-for-sale:
Total securities available-for-sale	35,646	43,894
Recurring | SBA loan pool securities
Securities available-for-sale:
Total securities available-for-sale	13,121	14,152
Recurring | Municipal bonds
Securities available-for-sale:
Total securities available-for-sale	6,124	782
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities available-for-sale:
Total securities available-for-sale	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
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential collateralized mortgage obligations
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | SBA loan pool securities
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Securities available-for-sale:
Total securities available-for-sale	128,049	97,566
Total assets measured at fair value on a recurring basis	128,049	97,566
Total liabilities measured at fair value on a recurring basis	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Securities available-for-sale:
Total securities available-for-sale	73,158	38,738
Recurring | Significant Other Observable Inputs (Level 2) | Residential collateralized mortgage obligations
Securities available-for-sale:
Total securities available-for-sale	35,646	43,894
Recurring | Significant Other Observable Inputs (Level 2) | SBA loan pool securities
Securities available-for-sale:
Total securities available-for-sale	13,121	14,152
Recurring | Significant Other Observable Inputs (Level 2) | Municipal bonds
Securities available-for-sale:
Total securities available-for-sale	6,124	782
Recurring | Significant Unobservable Inputs (Level 3)
Securities available-for-sale:
Total securities available-for-sale	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
Recurring | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Residential collateralized mortgage obligations
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | SBA loan pool securities
Securities available-for-sale:
Total securities available-for-sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Municipal bonds
Securities available-for-sale:
Total securities available-for-sale	$ 0	$ 0