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Borrowings - Summary of Terms of Current Debentures (Details) - Junior subordinated debt
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]  
Amount Outstanding $ 10,826
CTB Statutory Trust I  
Debt Instrument [Line Items]  
Amount Outstanding $ 6,702
Current Rate 3.43%
CTB Statutory Trust I | Maximum  
Debt Instrument [Line Items]  
Maximum Rate 12.50%
CTB Statutory Trust I | LIBOR  
Debt Instrument [Line Items]  
Basis spread on variable rate 3.30%
First Louisiana Statutory Trust I  
Debt Instrument [Line Items]  
Amount Outstanding $ 4,124
Current Rate 2.00%
First Louisiana Statutory Trust I | Maximum  
Debt Instrument [Line Items]  
Maximum Rate 16.00%
First Louisiana Statutory Trust I | LIBOR  
Debt Instrument [Line Items]  
Basis spread on variable rate 1.80%