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Subordinated Debt and Debentures - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
qtr
Dec. 31, 2021
USD ($)
Mar. 31, 2018
USD ($)
Subordinated Debt [Abstract]        
Subordinated debt   $ 39,433 $ 39,357  
Trust preferred securities   $ 38,400 38,400  
Distribution deferral period, maximum quarters | qtr   20    
Subordinated Debentures | TCSB Statutory Trust I        
Subordinated Debt [Abstract]        
Debt instrument, discount   $ 1,064 1,132 $ 1,400
Subordinated Debt        
Subordinated Debt [Abstract]        
Trust Preferred Securities Issued $ 40,000      
Debt instrument, term 10 years      
Call option period 5 years      
Debt instrument, interest rate, stated percentage 5.95%      
Fixed coupon rate percentage, period 5 years      
Subordinated debt   39,430 39,400  
Debt Instrument, unamortized discount (premium) and debt issuance costs, net   $ 570 $ 640  
Subordinated Debt | SOFR        
Subordinated Debt [Abstract]        
Interest rate spread 5.825%