Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)
Loans Modified as TDRs as of Period End [Abstract]
Accruing	$ 669,000		$ 669,000		$ 700,000
Nonaccrual	40,000		40,000		121,000
Total	$ 709,000		$ 709,000		821,000
Loans Modified as TDRs During the Period [Abstract]
Number of Loans | loan	0	1	2	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 131,000	$ 37,000	$ 131,000
Post-Modification Outstanding Recorded Investment	0	$ 131,000	37,000	$ 131,000
Number of commitments to lend to customers with outstanding loans that were classified as TDRs	0		0		0
Allowance for loan losses	$ 0		$ 0		4,000
Number of Loans | loan	0	0	1	0
Recorded Investment at Date of Default			$ 26,000	$ 0
Real Estate | Commercial property
Loans Modified as TDRs as of Period End [Abstract]
Accruing	$ 337,000		337,000		339,000
Nonaccrual	0		0		0
Total	337,000		337,000		339,000
Real Estate | SBA property
Loans Modified as TDRs as of Period End [Abstract]
Accruing	282,000		282,000		294,000
Nonaccrual	40,000		40,000		121,000
Total	$ 322,000		$ 322,000		415,000
Loans Modified as TDRs During the Period [Abstract]
Number of Loans | loan	0	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 131,000	$ 0	$ 131,000
Post-Modification Outstanding Recorded Investment	0	$ 131,000	0	$ 131,000
Commercial and Industrial | Commercial term
Loans Modified as TDRs as of Period End [Abstract]
Accruing	26,000		26,000		28,000
Nonaccrual	0		0		0
Total	26,000		26,000		28,000
Commercial and Industrial | SBA commercial term
Loans Modified as TDRs as of Period End [Abstract]
Accruing	24,000		24,000		39,000
Nonaccrual	0		0		0
Total	$ 24,000		$ 24,000		$ 39,000
Loans Modified as TDRs During the Period [Abstract]
Number of Loans | loan			2	0
Pre-Modification Outstanding Recorded Investment			$ 37,000	$ 0
Post-Modification Outstanding Recorded Investment			$ 37,000	$ 0
Number of Loans | loan			1	0
Recorded Investment at Date of Default			$ 26,000	$ 0