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v3.20.1

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% |  |

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