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Goodwill and Core Deposits and Other Intangibles - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization of intangibles $ 2,047,000 $ 2,140,000 $ 6,303,000    
Amortization expense remainder for this year 8,000,000.0        
Amortization expense for year 2026 7,800,000        
Amortization expense for year 2027 6,600,000        
Amortization expense for year 2028 4,200,000        
Amortization expense for year 2029 4,200,000        
Carrying amount of Company's goodwill $ 1,398,253,000   $ 1,398,253,000 $ 1,398,253,000 $ 1,398,253,000
Impairment of goodwill       $ 0