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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 422,125 $ 381,601 $ 414,494 $ 353,055
Loans charged-off to the allowance for credit losses 22,088 23,139 63,118 72,773
Recovery of previously charged-off loans 5,300 4,791 13,601 15,315
Financing Receivable, Credit Loss, Expense (Reversal) 29,113 28,281 69,473 95,937
Ending Balance 434,450 391,534 434,450 391,534
Commercial real estate - owner occupied        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 37,070 29,847 36,997 28,690
Loans charged-off to the allowance for credit losses 334 0 602 8,904
Recovery of previously charged-off loans 0 11 14 153
Financing Receivable, Credit Loss, Expense (Reversal) 3,454 1,842 3,781 11,761
Ending Balance 40,190 31,700 40,190 31,700
Commercial and Industrial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 187,020 154,014 174,799 148,212
Loans charged-off to the allowance for credit losses 18,167 19,842 52,619 50,611
Recovery of previously charged-off loans 3,727 3,281 9,069 10,030
Financing Receivable, Credit Loss, Expense (Reversal) 19,874 24,918 61,205 54,740
Ending Balance 192,454 162,371 192,454 162,371
Consumer real estate – mortgage        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 87,296 80,247 80,042 71,354
Loans charged-off to the allowance for credit losses 621 126 1,707 788
Recovery of previously charged-off loans 368 168 776 849
Financing Receivable, Credit Loss, Expense (Reversal) 1,013 (4,102) 8,945 4,772
Ending Balance 88,056 76,187 88,056 76,187
Construction and land development        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 32,753 30,035 33,620 39,142
Loans charged-off to the allowance for credit losses 274 0 274 0
Recovery of previously charged-off loans 11 0 13 9
Financing Receivable, Credit Loss, Expense (Reversal) 2,606 2,340 1,737 (6,776)
Ending Balance 35,096 32,375 35,096 32,375
Consumer and other        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 8,325 8,494 8,382 7,970
Loans charged-off to the allowance for credit losses 2,470 2,905 7,601 9,123
Recovery of previously charged-off loans 1,185 1,319 3,702 4,234
Financing Receivable, Credit Loss, Expense (Reversal) 3,099 1,230 5,656 5,057
Ending Balance 10,139 8,138 10,139 8,138
Commercial real estate - non-owner occupied        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 69,661 78,964 80,654 57,687
Loans charged-off to the allowance for credit losses 222 266 315 3,347
Recovery of previously charged-off loans 9 12 27 40
Financing Receivable, Credit Loss, Expense (Reversal) (933) 2,053 (11,851) 26,383
Ending Balance $ 68,515 $ 80,763 $ 68,515 $ 80,763