Subordinated Debentures - Additional Information (Details) - USD ($)			1 Months Ended	12 Months Ended
	Feb. 19, 2016	Mar. 15, 2012	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, face amount				$ 105,000,000	$ 105,000,000
Interest expenses, paid				6,649,000	3,552,000
Debt aggregate amortization expense				$ 167,000	$ 106,000	$ 90,000
Subordinated Debentures
Debt Instrument [Line Items]
Percentage of principal amount redeemed		100.00%
Debt instrument redemption period				Mar. 15, 2012
Debt instrument maturity period				Mar. 15, 2037
Defer interest payments maximum period				5 years
Debt instrument interest rate description				three month London Interbank Offered Rate (LIBOR) plus 1.65%, which was 3.54% as of December 31, 2019 and 4.66% at December 31, 2018.
Debt instrument interest percentage				3.54%	4.66%
Interest expenses, paid				$ 540,000	$ 263,000	$ 144,000
TFC Statutory Trust | Private Offering
Debt Instrument [Line Items]
Number of trust preferred securities	5,000
Trust preferred securities liquidation amount per preferred security	$ 1,000
TFC Statutory Trust | Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, face amount	$ 5,000,000
Debt valuation reserve				1,900,000
TFC Statutory Trust | Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Subordinated debenture liability	$ 3,300,000
First American International Statutory Trust I
Debt Instrument [Line Items]
Number of units issued			7,000
Aggregate liquidation amount of units issued			$ 7,000,000
Floating rate maturity period			30 years
First American International Statutory Trust I | Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, face amount			$ 7,000,000
Debt valuation reserve				$ 1,200,000
Debt instrument maturity period				Dec. 15, 2034
Defer interest payments maximum period				5 years
Debt instrument interest rate description				the three-month LIBOR plus 2.25% through final maturity on December 15, 2034. The rate at December 31, 2019, was 4.14% and 5.04% at December 31, 2018.
Debt instrument interest percentage				4.14%	5.04%
Other Assets
Debt Instrument [Line Items]
Investment in common stock				$ 155,000
Other Assets | First American International Statutory Trust I
Debt Instrument [Line Items]
Investment in common stock				$ 217,000
London Interbank Offered Rate | Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, basis points				1.65%
London Interbank Offered Rate | First American International Statutory Trust I | Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, basis points				2.25%