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Goodwill and Core Deposits and Other Intangibles - Summary of Changes in Carrying Amount and Accumulated Amortization of Company's Goodwill and Core Deposits and Other Intangibles (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Goodwill        
Goodwill $ 1,398,253   $ 1,398,253 $ 1,398,253
Core Deposit Intangibles        
Balance, beginning of period 40,327 $ 48,770 46,630  
Amortization expense (2,047) (2,140) (6,303)  
Balance, end of year $ 38,280 $ 46,630 $ 40,327