v3.26.1
SEGMENT INFORMATION (Details) - 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 Information [Line Items]          
Net interest income from external customers $ 139,144 $ 124,748 $ 273,856 $ 244,960  
Noninterest revenues from external segments 84,011 74,508 162,585 150,544  
Total segment operating revenues 219,815 200,497 435,051 397,841  
Equity in net loss of investees accounted for by the equity method (463) 0 (789) 0  
Other revenues 4,710 (1) 4,309 244  
Revenue 223,155 199,256 436,441 395,504  
Provision for credit losses 4,607 4,117 10,243 10,807  
Salaries and employee benefits 82,431 79,021 162,753 155,463  
Data processing and communications 19,686 16,699 37,557 32,821  
Occupancy and equipment 13,885 11,486 28,767 24,184  
Legal and professional fees 4,314 4,368 9,384 9,217  
Business development and marketing 2,556 4,001 5,091 7,131  
Reconciliation of operating profit loss from segment to consolidated          
Net (loss) gain recognized on equity securities 4,710 (1) 4,309 244  
Amortization of intangible assets (4,408) (3,369) (8,654) (6,851)  
Restructuring expenses       (1,525)  
Acquisition expenses (231) (1,525) (664) (68)  
Acquisition-related contingent consideration adjustment 103   (103)    
Litigation accrual (335) (67) (335) 50  
Operating income before income taxes 80,815 66,037 155,429 130,305  
Information about reportable segments          
Interest income 184,352 172,878 364,339 340,525  
Interest expense 45,208 48,130 90,483 95,565  
Depreciation 6,086 3,657 11,341 7,301  
Amortization of intangible assets 4,408 3,369 8,654 6,851  
Goodwill 900,650 854,817 900,650 854,817 $ 887,975
Core deposit intangibles, net 15,732 3,963 15,732 3,963 14,754
Other intangibles, net 47,312 39,601 47,312 39,601 39,987
Segment assets 17,763,770 16,665,018 17,763,770 16,665,018 $ 17,303,296
Banking and Corporate          
Segment Reporting Information [Line Items]          
Total segment operating revenues 159,426 143,922 314,957 282,394  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets (1,057) (585)      
Information about reportable segments          
Depreciation 5,707 3,328      
Amortization of intangible assets 1,057 585      
Goodwill 764,714 732,598 764,714 732,598  
Core deposit intangibles, net 12,689 3,963 12,689 3,963  
Other intangibles, net 435 621 435 621  
Employee Benefit Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues 36,360 33,892 72,671 68,008  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets (1,827) (1,774)      
Information about reportable segments          
Depreciation 235 176      
Amortization of intangible assets 1,827 1,774      
Goodwill 91,046 90,959 91,046 90,959  
Core deposit intangibles, net 0 0 0 0  
Other intangibles, net 16,445 21,992 16,445 21,992  
Insurance Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues 12,811 13,464 25,142 27,734  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets (1,191) (883)      
Information about reportable segments          
Depreciation 85 102      
Amortization of intangible assets 1,191 883      
Goodwill 30,816 27,822 30,816 27,822  
Core deposit intangibles, net 0 0 0 0  
Other intangibles, net 21,167 16,082 21,167 16,082  
Wealth Management Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues 11,218 9,219 22,281 19,705  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets (333) (127)      
Information about reportable segments          
Depreciation 59 51      
Amortization of intangible assets 333 127      
Goodwill 14,074 3,438 14,074 3,438  
Core deposit intangibles, net 3,043 0 3,043 0  
Other intangibles, net 9,265 906 9,265 906  
Operating segment          
Segment Reporting Information [Line Items]          
Net interest income from external customers 139,144 124,748 273,856 244,960  
Noninterest revenues from external segments 79,764 74,509 159,065 150,300  
Total segment operating revenues 218,908 199,257 432,921 395,260  
Equity in net loss of investees accounted for by the equity method (463)   (789)    
Segment adjusted income before income taxes 80,976 70,999 160,670 138,455  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets     (8,654) (6,851)  
Information about reportable segments          
Interest income 185,544 173,520 366,559 341,815  
Interest expense 46,400 48,772 92,703 96,855  
Depreciation     11,341 7,301  
Amortization of intangible assets     8,654 6,851  
Segment assets 17,984,281 16,764,993 17,984,281 16,764,993  
Operating segment | Banking and Corporate          
Segment Reporting Information [Line Items]          
Net interest income from external customers 139,089 124,615 273,668 244,702  
Noninterest revenues from external segments 21,239 19,728 42,991 38,544  
Total segment operating revenues 160,328 144,343 316,659 283,246  
Equity in net loss of investees accounted for by the equity method 0   0    
Provision for credit losses 4,607 4,117 10,243 10,807  
Salaries and employee benefits 52,003 48,647 102,133 95,772  
Data processing and communications 16,640 13,953 31,588 27,440  
Occupancy and equipment 12,383 10,107 25,675 21,292  
Legal and professional fees 2,513 2,600 5,509 6,070  
Business development and marketing 2,036 3,644 4,259 6,567  
Other segment items 7,556 6,362 14,251 13,681  
Segment adjusted income before income taxes 61,688 54,492 121,299 100,765  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets     (2,152) (1,288)  
Information about reportable segments          
Interest income 184,178 172,745 364,031 340,267  
Interest expense 46,280 48,772 92,583 96,855  
Depreciation     10,629 6,628  
Amortization of intangible assets     2,152 1,288  
Segment assets 17,436,748 16,429,774 17,436,748 16,429,774  
Operating segment | Employee Benefit Services          
Segment Reporting Information [Line Items]          
Net interest income from external customers 139 133 272 258  
Noninterest revenues from external segments 34,885 32,681 69,476 65,565  
Total segment operating revenues 35,024 32,814 69,748 65,823  
Equity in net loss of investees accounted for by the equity method 0   0    
Provision for credit losses 0 0 0 0  
Salaries and employee benefits 16,182 16,574 32,828 32,629  
Data processing and communications 1,254 1,196 2,471 2,279  
Occupancy and equipment 987 881 2,016 1,837  
Legal and professional fees 1,812 1,570 3,882 2,996  
Business development and marketing 159 71 263 87  
Other segment items 2,125 1,689 3,043 2,829  
Segment adjusted income before income taxes 13,841 11,911 28,168 25,351  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets     (3,661) (3,491)  
Information about reportable segments          
Interest income 831 595 1,777 1,196  
Interest expense 0 0 0 0  
Depreciation     435 364  
Amortization of intangible assets     3,661 3,491  
Segment assets 228,872 223,464 228,872 223,464  
Operating segment | Insurance Services          
Segment Reporting Information [Line Items]          
Net interest income from external customers 0 0 0 0  
Noninterest revenues from external segments 13,195 13,388 25,781 27,589  
Total segment operating revenues 13,195 13,388 25,781 27,589  
Equity in net loss of investees accounted for by the equity method (463)   (789)    
Provision for credit losses 0 0 0 0  
Salaries and employee benefits 8,638 8,884 17,220 17,231  
Data processing and communications 947 855 1,918 1,728  
Occupancy and equipment 412 391 854 832  
Legal and professional fees 88 179 167 279  
Business development and marketing 272 260 412 446  
Other segment items 449 648 717 863  
Segment adjusted income before income taxes 2,005 2,247 3,854 6,355  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets     (2,379) (1,807)  
Information about reportable segments          
Interest income 54 50 99 94  
Interest expense 0 0 0 0  
Depreciation     173 208  
Amortization of intangible assets     2,379 1,807  
Segment assets 114,278 72,623 114,278 72,623  
Operating segment | Wealth Management Services          
Segment Reporting Information [Line Items]          
Net interest income from external customers (84) 0 (84) 0  
Noninterest revenues from external segments 10,445 8,712 20,817 18,602  
Total segment operating revenues 10,361 8,712 20,733 18,602  
Equity in net loss of investees accounted for by the equity method 0   0    
Provision for credit losses 0 0 0 0  
Salaries and employee benefits 6,439 5,699 12,360 11,429  
Data processing and communications 845 694 1,580 1,373  
Occupancy and equipment 129 133 273 275  
Legal and professional fees 88 202 312 310  
Business development and marketing 89 27 157 31  
Other segment items 186 115 250 303  
Segment adjusted income before income taxes 3,442 2,349 7,349 5,984  
Reconciliation of operating profit loss from segment to consolidated          
Amortization of intangible assets     (462) (265)  
Information about reportable segments          
Interest income 481 130 652 258  
Interest expense 120 0 120 0  
Depreciation     104 101  
Amortization of intangible assets     462 265  
Segment assets 204,383 39,132 204,383 39,132  
Inter segment elimination          
Segment Reporting Information [Line Items]          
Noninterest revenues from external segments (1,370) (1,240) (2,919) (2,581)  
Total segment operating revenues 1,370 1,240 2,919 2,581  
Information about reportable segments          
Interest income (1,192) (642) (2,220) (1,290)  
Interest expense (1,192) (642) (2,220) (1,290)  
Segment assets (220,511) (99,975) (220,511) (99,975)  
Inter segment elimination | Banking and Corporate          
Segment Reporting Information [Line Items]          
Total segment operating revenues (902) (421) (1,702) (852)  
Inter segment elimination | Employee Benefit Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues 1,336 1,078 2,923 2,185  
Inter segment elimination | Insurance Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues 79 76 150 145  
Inter segment elimination | Wealth Management Services          
Segment Reporting Information [Line Items]          
Total segment operating revenues $ 857 $ 507 $ 1,548 $ 1,103