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Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
location
segment
banking_center
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]              
Number of banking centers | banking_center         60    
Number of planned banking locations | location         2    
Number of segments | segment         1    
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]         Accrued interest receivable and other assets    
Equity investments       $ 15,800,000 $ 25,900,000 $ 15,800,000  
Mortgage servicing right impairment       2,000,000 4,089,000 (1,219,000) $ 2,593,000
MSR sold $ 1,800,000 $ 1,800,000 $ 1,800,000   1,806,000 0 0
Unpaid principal balance 453,300,000            
Liability to repurchase past due GNMA loans $ 24,600,000     24,600,000 0 24,600,000  
Other real estate owned       806,000 3,900,000 806,000  
Penalties and related interest         0 0 $ 0
Other investments       20,900,000 22,200,000 20,900,000  
Investments in tax credit entities       $ 9,400,000 $ 7,600,000 $ 9,400,000  
Tax Credit Entity              
Property, Plant and Equipment [Line Items]              
General partner ownership interest         0.10%    
Maximum | Buildings and improvements              
Property, Plant and Equipment [Line Items]              
Estimated useful lives         39 years    
Maximum | Furniture, fixtures and equipment              
Property, Plant and Equipment [Line Items]              
Estimated useful lives         7 years    
Minimum | Buildings and improvements              
Property, Plant and Equipment [Line Items]              
Estimated useful lives         15 years    
Minimum | Furniture, fixtures and equipment              
Property, Plant and Equipment [Line Items]              
Estimated useful lives         3 years