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Borrowings - Narrative (Details)
 1 Months Ended 12 Months Ended
Jun. 30, 2023
Oct. 29, 2021
USD ($)
extension_option
Oct. 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Oct. 28, 2021
USD ($)
Debt Instrument [Line Items]              
Line of credit outstanding, long-term         $ 0    
Overnight repurchase agreements with depositors              
Debt Instrument [Line Items]              
Daily average interest rate         2.62% 2.21%  
Line of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 145,000,000 $ 145,000,000  
Line of credit outstanding, short-term         0 0  
Amount held on deposit         250,000    
Secured repurchase line of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity         75,000,000 75,000,000  
FHLB advances              
Debt Instrument [Line Items]              
Subordinated indebtedness, net         6,198,000    
Line of credit | Revolving credit loans              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 100,000,000         $ 50,000,000.0
Incremental revolving loan maximum   $ 50,000,000.0          
Debt instrument, option to extend, term   364 days          
Number of options to extend term | extension_option   2          
Line of credit | Revolving credit loans | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Interest rate   3.35%          
Subordinated indebtedness, net              
Debt Instrument [Line Items]              
Interest Rate     4.50% 4.25%      
Interest rate     4.32%        
Subordinated indebtedness, net         159,943,000 194,279,000  
Principal amount     $ 80,000,000 $ 70,000,000      
Repurchased amount of notes         $ 1,000,000 5,000,000  
Subordinated indebtedness, net | BTH              
Debt Instrument [Line Items]              
Subordinated indebtedness, net           $ 34,700,000  
Debt instrument, redemption period, term threshold           5 years  
Subordinated indebtedness, net | Secured Overnight Financing Rate (SOFR)              
Debt Instrument [Line Items]              
Interest rate 3.08%            
Subordinated indebtedness, net | LIBOR              
Debt Instrument [Line Items]              
Interest rate       2.82%      
Minimum | FHLB advances              
Debt Instrument [Line Items]              
Interest Rate         1.99% 1.99%  
Minimum | Line of credit | Revolving credit loans              
Debt Instrument [Line Items]              
Written request prior to maturity, term   30 days          
Maximum | FHLB advances              
Debt Instrument [Line Items]              
Interest Rate         4.57% 4.57%  
Maximum | Line of credit | Revolving credit loans              
Debt Instrument [Line Items]              
Written request prior to maturity, term   60 days          
FHLB              
Debt Instrument [Line Items]              
Net amounts available under the blanket floating lien         $ 2,150,000,000 $ 2,010,000,000.00  
Federal Reserve Bank of Dallas | Line of credit              
Debt Instrument [Line Items]              
Current borrowing capacity         1,330,000,000 1,420,000,000  
Total Loans Receivable         1,570,000,000 1,690,000,000  
Line of credit outstanding, long-term         $ 0 $ 0