Securities - Realized Gains and Losses (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Investments [Line Items]
Other than temporary impairment		$ 0
Realized gains	$ 35,000	0	$ 127,000
Realized losses	0	4,000	$ 65,000
Available-for-sale securities pledged as collateral	$ 4,000,000	$ 4,300,000
2 Mortgage Backed Securities | Mortgage-backed securities
Schedule of Investments [Line Items]
Number of securities sold | security	2		2
Book value	$ 3,500,000		$ 1,600,000
Securities realized gain (loss)	$ 64,000		$ (58,000)
2 SBA Securities | SBA Securities
Schedule of Investments [Line Items]
Number of securities sold | security	2
Book value	$ 2,100,000
Securities realized gain (loss)	$ (29,000)
1 Security Sold | Municipal Securities
Schedule of Investments [Line Items]
Number of securities sold | security		1
Book value		$ 174,000
Securities realized gain (loss)		$ (4,000)
3 Mortgage Backed Securities | Mortgage-backed securities
Schedule of Investments [Line Items]
Number of securities sold | security			3
Book value			$ 1,200,000
Securities realized gain (loss)			$ 71,000
1 SBA Security | SBA Securities
Schedule of Investments [Line Items]
Number of securities sold | security			1
Book value			$ 529,000
Securities realized gain (loss)			$ 38,000
2 Asset-Backed Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Number of securities sold | security			2
Book value			$ 3,500,000
Securities realized gain (loss)			$ 3,000
4 Securities Sold | Municipal Securities
Schedule of Investments [Line Items]
Number of securities sold | security			4
Book value			$ 500,000
Securities realized gain (loss)			$ 15,000
2 Corporate Bonds | Corporate Bond Securities
Schedule of Investments [Line Items]
Number of securities sold | security			2
Book value			$ 3,000,000
Securities realized gain (loss)			$ (7,000)