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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | $ 307,731 | $ 318,882
Allowance for loan losses: Net provision for loan losses | 13,172 | 10,462
Allowance for loan losses: Ending balance | 311,316 | 318,119
Reserve for unfunded lending commitments: Beginning balance | 33,928 | 24,053
Reserve for unfunded lending commitments: Provision for losses | 1,549 | (978)
Reserve for unfunded lending commitments: Ending balance | 32,379 | 25,031
Total allowance for credit losses | 343,695 | 343,150
Allowance for credit losses: Individually evaluated | 11,233 | 11,404
Allowance for credit losses: Collectively evaluated | 332,462 | 331,746
Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (13,393) | (13,293)
Allowance for loan losses: Recoveries | 2,257 | 3,046
Allowance for loan losses: Net provision for loan losses | 14,721 | 9,484
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | 60,475 | 71,975
Allowance for loan losses: Ending balance | 57,115 | 70,379
Reserve for unfunded lending commitments: Beginning balance | 1,005 | 642
Reserve for unfunded lending commitments: Provision for losses | 183 | (198)
Reserve for unfunded lending commitments: Ending balance | 822 | 444
Total allowance for credit losses | 57,937 | 70,823
Allowance for credit losses: Collectively evaluated | 57,937 | 70,823
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | 17,450 | 21,158
Allowance for loan losses: Ending balance | 17,710 | 20,208
Reserve for unfunded lending commitments: Beginning balance | 17,949 | 14,639
Reserve for unfunded lending commitments: Provision for losses | 86 | (696)
Reserve for unfunded lending commitments: Ending balance | 18,035 | 15,335
Total allowance for credit losses | 35,745 | 35,543
Allowance for credit losses: Collectively evaluated | 35,745 | 35,543
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 | 0 | (34)
Allowance for loan losses: Recoveries | 3 | 0
Allowance for loan losses: Net provision for loan losses | (3,363) | 1,562
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 | (219) | (8)
Allowance for loan losses: Recoveries | 1 | 110
Allowance for loan losses: Net provision for loan losses | (478) | (1,052)
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | 162,134 | 157,354
Allowance for loan losses: Ending balance | 171,219 | 158,348
Reserve for unfunded lending commitments: Beginning balance | 13,010 | 6,750
Reserve for unfunded lending commitments: Provision for losses | 1,340 | 502
Reserve for unfunded lending commitments: Ending balance | 11,670 | 7,252
Total allowance for credit losses | 182,889 | 165,600
Allowance for credit losses: Individually evaluated | 10,947 | 10,455
Allowance for credit losses: Collectively evaluated | 171,942 | 155,145
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 | 121,439 | 121,090
Allowance for loan losses: Net provision for loan losses | 13,433 |
Allowance for loan losses: Ending balance | 127,489 | 122,215
Reserve for unfunded lending commitments: Beginning balance | 12,639 | 6,441
Reserve for unfunded lending commitments: Provision for losses | (1,292) | 515
Reserve for unfunded lending commitments: Ending balance | 11,347 | 6,956
Total allowance for credit losses | 138,836 | 129,171
Allowance for credit losses: Individually evaluated | 10,947 | 10,406
Allowance for credit losses: Collectively evaluated | 127,889 | 118,765
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 | 40,695 | 36,264
Allowance for loan losses: Ending balance | 43,730 | 36,133
Reserve for unfunded lending commitments: Beginning balance | 371 | 309
Reserve for unfunded lending commitments: Provision for losses | (48) | (13)
Reserve for unfunded lending commitments: Ending balance | 323 | 296
Total allowance for credit losses | 44,053 | 36,429
Allowance for credit losses: Individually evaluated |  | 49
Allowance for credit losses: Collectively evaluated | 44,053 | 36,380
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 | (8,514) | (8,873)
Allowance for loan losses: Recoveries | 1,265 | 1,745
Allowance for loan losses: Net provision for loan losses | 16,334 | 8,122
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 | (8,506) | (6,132)
Allowance for loan losses: Recoveries | 1,123 | 1,650
Allowance for loan losses: Net provision for loan losses |  | 5,607
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 | (8) |
Allowance for loan losses: Recoveries | 142 | 95
Allowance for loan losses: Net provision for loan losses | 2,901 | (2,515)
Residential Mortgages [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | 42,834 | 42,445
Allowance for loan losses: Ending balance | 41,566 | 43,200
Reserve for unfunded lending commitments: Beginning balance | 3 | 4
Reserve for unfunded lending commitments: Provision for losses | (2) | (1)
Reserve for unfunded lending commitments: Ending balance | 1 | 3
Total allowance for credit losses | 41,567 | 43,203
Allowance for credit losses: Individually evaluated | 234 | 752
Allowance for credit losses: Collectively evaluated | 41,333 | 42,451
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (250) | (167)
Allowance for loan losses: Recoveries | 71 | 387
Allowance for loan losses: Net provision for loan losses | 1,089 | 535
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | 24,838 | 25,950
Allowance for loan losses: Ending balance | 23,706 | 25,984
Reserve for unfunded lending commitments: Beginning balance | 1,961 | 2,018
Reserve for unfunded lending commitments: Provision for losses | (110) | 21
Reserve for unfunded lending commitments: Ending balance | 1,851 | 1,997
Total allowance for credit losses | 25,557 | 27,981
Allowance for credit losses: Individually evaluated | 52 | 197
Allowance for credit losses: Collectively evaluated | 25,505 | 27,784
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (4,410) | (4,211)
Allowance for loan losses: Recoveries | 917 | 804
Allowance for loan losses: Net provision for loan losses | $ 2,361 | $ 3,441

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