XML 79 R67.htm IDEA: XBRL DOCUMENT v3.24.1.u1
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 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2023
Goodwill        
Balance, beginning of period $ 1,398,253 $ 1,398,253   $ 1,398,253
Acquisitions 0     0
Balance, end of period 1,398,253   $ 1,398,253 1,398,253
Core Deposit Intangibles        
Balance, beginning of period 48,770 58,455 55,978 58,455
Amortization expense (2,140) (2,477) (7,208)  
Balance, end of year $ 46,630 $ 55,978 $ 48,770 $ 48,770