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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (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 Losses [Line Items]        
Allowance for loan losses: Beginning balance     $ 318,882 $ 307,907
Allowance for loan losses: provision for loan losses $ 12,651 $ 18,564 38,038 40,255
Allowance for loan losses: Ending balance 313,636 317,271 313,636 317,271
Reserve for unfunded lending commitments: Beginning balance     24,053 28,894
Reserve for unfunded lending commitments: Provision for losses     3,821 (3,401)
Reserve for unfunded lending commitments: Ending balance 27,874 25,493 27,874 25,493
Total allowance for credit losses 341,510 342,764 341,510 342,764
Allowance for credit losses: Individually evaluated 12,769 5,994 12,769 5,994
Allowance for credit losses: Collectively evaluated 328,741 336,770 328,741 336,770
Non-Purchased Credit Impaired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (51,357) (56,430)
Allowance for loan losses: Recoveries     11,894 22,138
Allowance for loan losses: provision for loan losses     34,217 43,656
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     71,975 74,539
Allowance for loan losses: Ending balance 62,155 78,467 62,155 78,467
Reserve for unfunded lending commitments: Beginning balance     642 1,344
Reserve for unfunded lending commitments: Provision for losses     3 (353)
Reserve for unfunded lending commitments: Ending balance 645 991 645 991
Total allowance for credit losses 62,800 79,458 62,800 79,458
Allowance for credit losses: Collectively evaluated 62,800 79,458 62,800 79,458
Total Commercial [Member] | Construction and Land Development [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     21,158 27,039
Allowance for loan losses: Ending balance 17,211 24,793 17,211 24,793
Reserve for unfunded lending commitments: Beginning balance     14,639 20,019
Reserve for unfunded lending commitments: Provision for losses     168 (4,250)
Reserve for unfunded lending commitments: Ending balance 14,807 15,769 14,807 15,769
Total allowance for credit losses 32,018 40,562 32,018 40,562
Allowance for credit losses: Collectively evaluated 32,018 40,562 32,018 40,562
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Income Producing [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (34) (8,819)
Allowance for loan losses: Recoveries       7
Allowance for loan losses: provision for loan losses     (9,798) 12,740
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (1,291) (264)
Allowance for loan losses: Recoveries     123 62
Allowance for loan losses: provision for loan losses     (2,779) (2,044)
Total Commercial [Member] | Total Commercial And Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     157,354 141,934
Allowance for loan losses: Ending balance 165,890 146,283 165,890 146,283
Reserve for unfunded lending commitments: Beginning balance     6,750 5,834
Reserve for unfunded lending commitments: Provision for losses     3,784 709
Reserve for unfunded lending commitments: Ending balance 10,534 6,543 10,534 6,543
Total allowance for credit losses 176,424 152,826 176,424 152,826
Allowance for credit losses: Individually evaluated 11,735 5,047 11,735 5,047
Allowance for credit losses: Collectively evaluated 164,689 147,779 164,689 147,779
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     121,090 101,737
Allowance for loan losses: Ending balance 125,854 108,743 125,854 108,743
Reserve for unfunded lending commitments: Beginning balance     6,441 5,507
Reserve for unfunded lending commitments: Provision for losses     3,785 752
Reserve for unfunded lending commitments: Ending balance 10,226 6,259 10,226 6,259
Total allowance for credit losses 136,080 115,002 136,080 115,002
Allowance for credit losses: Individually evaluated 11,131 4,996 11,131 4,996
Allowance for credit losses: Collectively evaluated 124,949 110,006 124,949 110,006
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     36,264 40,197
Allowance for loan losses: Ending balance 40,036 37,540 40,036 37,540
Reserve for unfunded lending commitments: Beginning balance     309 327
Reserve for unfunded lending commitments: Provision for losses     (1) (43)
Reserve for unfunded lending commitments: Ending balance 308 284 308 284
Total allowance for credit losses 40,344 37,824 40,344 37,824
Allowance for credit losses: Individually evaluated 604 51 604 51
Allowance for credit losses: Collectively evaluated 39,740 37,773 39,740 37,773
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (37,071) (33,869)
Allowance for loan losses: Recoveries     9,025 19,053
Allowance for loan losses: provision for loan losses     36,582 19,165
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Non-Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (32,445) (33,869)
Allowance for loan losses: Recoveries     8,484 18,067
Allowance for loan losses: provision for loan losses     28,725 22,808
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Owner Occupied        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (4,626)  
Allowance for loan losses: Recoveries     541 986
Allowance for loan losses: provision for loan losses     7,857 (3,643)
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Income Producing [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Recoveries     12  
Residential Mortgages [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     42,445 38,983
Allowance for loan losses: Ending balance 42,631 42,857 42,631 42,857
Reserve for unfunded lending commitments: Beginning balance     4 30
Reserve for unfunded lending commitments: Provision for losses     (3) (27)
Reserve for unfunded lending commitments: Ending balance 1 3 1 3
Total allowance for credit losses 42,632 42,860 42,632 42,860
Allowance for credit losses: Individually evaluated 841 750 841 750
Allowance for credit losses: Collectively evaluated 41,791 42,110 41,791 42,110
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (678) (229)
Allowance for loan losses: Recoveries     521 430
Allowance for loan losses: provision for loan losses     343 3,673
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Beginning balance     25,950 25,412
Allowance for loan losses: Ending balance 25,749 24,871 25,749 24,871
Reserve for unfunded lending commitments: Beginning balance     2,018 1,667
Reserve for unfunded lending commitments: Provision for losses     (131) 520
Reserve for unfunded lending commitments: Ending balance 1,887 2,187 1,887 2,187
Total allowance for credit losses 27,636 27,058 27,636 27,058
Allowance for credit losses: Individually evaluated 193 197 193 197
Allowance for credit losses: Collectively evaluated $ 27,443 $ 26,861 27,443 26,861
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan losses: Charge-offs     (12,283) (13,249)
Allowance for loan losses: Recoveries     2,213 2,586
Allowance for loan losses: provision for loan losses     $ 9,869 $ 10,122