Fair Value Disclosures - Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 8,300		$ 540
Total assets	221	$ 349
Transfer of loans to other real estate owned	8,125	$ 0
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually analyzed loans held for investment	28,675		36,018
Other real estate owned	8,270		516
Total assets	36,945		36,811
Individually analyzed leases held for investment			277
Fair Value, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually analyzed loans held for investment	0		0
Other real estate owned	0		0
Total assets	0		0
Individually analyzed leases held for investment			0
Fair Value, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually analyzed loans held for investment	0		0
Other real estate owned	0		0
Total assets	0		0
Individually analyzed leases held for investment			0
Fair Value, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually analyzed loans held for investment	28,675		36,018
Other real estate owned	8,270		516
Total assets	$ 36,945		36,811
Individually analyzed leases held for investment			$ 277