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Loans - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Aug. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
PCD loans $ 34,800,000 $ 48,100,000        
Accrued interest 35,100,000 27,100,000   $ 35,100,000 $ 27,100,000  
Declined amount of provision expense for loan credit losses       4,100,000    
Provision expense for loan credit losses       17,514,000 21,613,000 $ (10,798,000)
Collectively evaluated portion of increase (decrease) related to reserve 5,300,000     5,300,000    
Individually evaluated portion of increase (decrease) related to reserve 4,400,000     4,400,000    
Funding commitments 1,600,000 0   1,600,000 0  
Gross interest income that would have been recorded       12,049,000 8,759,000 12,234,000
Transfer from held for sale portfolio to held for investment portfolio       7,100,000    
Nonaccrual mortgage loans held for sale recorded at fair value $ 0 $ 3,900,000   0 3,900,000  
BTH            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
PCD loans     $ 47,127,000      
CECL loan provision     $ 14,900,000      
Nonperforming Financial Instruments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross interest income that would have been recorded       1,400,000 1,300,000 1,900,000
Interest income       $ 0 $ 0 $ 0