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Nature of Operations and Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives for Book Purposes (Detail)
Dec. 31, 2023
Bank premises | Minimum  
Property Plant And Equipment Estimated Useful Lives [Line Items]  
Useful lives 15 years
Bank premises | Maximum  
Property Plant And Equipment Estimated Useful Lives [Line Items]  
Useful lives 40 years
Furniture, fixtures, and equipment | Minimum  
Property Plant And Equipment Estimated Useful Lives [Line Items]  
Useful lives 3 years
Furniture, fixtures, and equipment | Maximum  
Property Plant And Equipment Estimated Useful Lives [Line Items]  
Useful lives 15 years