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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATING INCOME      
Interest on interest-bearing deposits $ 134,908 $ 119,260 $ 58,848
OPERATING EXPENSE      
Other 51,741 50,009 53,258
Allocated income tax benefit (58,927) (57,483) (44,332)
Amortization of stock-based compensation arrangements of subsidiaries (3,452) (2,999) (1,941)
Net income 216,354 212,465 193,100
Parent Company [Member]      
OPERATING INCOME      
Dividends from subsidiaries 128,478 137,275 93,139
Interest on interest-bearing deposits 4,229 1,178 94
Other 549 726 1,338
Total operating income 133,256 139,179 94,571
OPERATING EXPENSE      
Interest 4,122 4,122 4,122
Other 3,918 3,206 7,190
Total operating expense 8,040 7,328 11,312
Income before taxes 125,216 131,851 83,259
Allocated income tax benefit 2,112 2,249 5,857
Income before equity in undistributed earnings of subsidiaries 127,328 134,100 89,116
Equity in undistributed earnings of subsidiaries 92,315 81,275 105,817
Amortization of stock-based compensation arrangements of subsidiaries (3,289) (2,910) (1,833)
Net income $ 216,354 $ 212,465 $ 193,100