v3.26.1
Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Interest income $ 120,986 $ 116,361 $ 238,813 $ 230,438  
Other revenues 18,246 17,090 35,278 33,163  
Interest expense 27,356 29,842 53,957 61,377  
Salaries and related benefits 38,972 38,286 75,117 75,141  
Other 23,953 22,845 46,860 45,575  
Provision for income taxes 12,127 10,271 24,323 19,210  
Segment net income/consolidated net income 34,169 27,542 67,854 53,905  
Total assets for reportable segment 9,930,763   9,930,763   $ 9,822,063
Total consolidated assets 9,930,763   9,930,763   $ 9,822,063
Reportable segment          
Segment Reporting [Line Items]          
Interest income 120,986 116,361 238,813 230,438  
Other revenues 18,246 17,090 35,278 33,163  
Total consolidated revenues 139,232 133,451 274,091 263,601  
Interest expense 27,356 29,842 53,957 61,377  
Segment net interest income and noninterest income 111,876 103,609 220,134 202,224  
Provision for credit losses 2,655 4,665 5,980 8,393  
Salaries and related benefits 38,972 38,286 75,117 75,141  
Other 23,953 22,845 46,860 45,575  
Provision for income taxes 12,127 10,271 24,323 19,210  
Segment net income/consolidated net income 34,169 27,542 67,854 53,905  
Total assets for reportable segment 9,930,763 9,923,983 9,930,763 9,923,983  
Other assets 0 0 0 0  
Total consolidated assets $ 9,930,763 $ 9,923,983 $ 9,930,763 $ 9,923,983