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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, 2025 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Beginning balance | $ 318,882 | $ 307,907
Allowance for loan losses: Net provision for loan losses | 10,462 | 12,968
Allowance for loan losses: Ending balance | 318,119 | 313,726
Reserve for unfunded lending commitments: Beginning balance | 24,053 | 28,894
Reserve for unfunded lending commitments: Provision for losses | 978 | (1,831)
Reserve for unfunded lending commitments: Ending balance | 25,031 | 27,063
Total allowance for credit losses | 343,150 | 340,789
Allowance for credit losses: Individually evaluated | 11,404 |
Allowance for credit losses: Collectively evaluated | 331,746 | 340,789
Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (13,293) | (23,366)
Allowance for loan losses: Recoveries | 3,046 | 14,386
Allowance for loan losses: Net provision for loan losses | 9,484 | 14,799
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 | 70,379 | 77,877
Reserve for unfunded lending commitments: Beginning balance | 642 | 1,344
Reserve for unfunded lending commitments: Provision for losses | (198) | (352)
Reserve for unfunded lending commitments: Ending balance | 444 | 992
Total allowance for credit losses | 70,823 | 78,869
Allowance for credit losses: Collectively evaluated | 70,823 | 78,869
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 | 20,208 | 25,838
Reserve for unfunded lending commitments: Beginning balance | 14,639 | 20,019
Reserve for unfunded lending commitments: Provision for losses | 696 | (1,615)
Reserve for unfunded lending commitments: Ending balance | 15,335 | 18,404
Total allowance for credit losses | 35,543 | 44,242
Allowance for credit losses: Collectively evaluated | 35,543 | 44,242
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 |  | 3
Allowance for loan losses: Net provision for loan losses | (1,562) | 12,154
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 | (8) | (75)
Allowance for loan losses: Recoveries | 110 | 61
Allowance for loan losses: Net provision for loan losses | (1,052) | (1,187)
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 | 158,348 | 143,636
Reserve for unfunded lending commitments: Beginning balance | 6,750 | 5,834
Reserve for unfunded lending commitments: Provision for losses | 502 | 152
Reserve for unfunded lending commitments: Ending balance | 7,252 | 5,986
Total allowance for credit losses | 165,600 | 149,622
Allowance for credit losses: Individually evaluated | 10,455 |
Allowance for credit losses: Collectively evaluated | 155,145 | 149,622
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 | 122,215 | 104,358
Reserve for unfunded lending commitments: Beginning balance | 6,441 | 5,507
Reserve for unfunded lending commitments: Provision for losses | 515 | 192
Reserve for unfunded lending commitments: Ending balance | 6,956 | 5,699
Total allowance for credit losses | 129,171 | 110,057
Allowance for credit losses: Individually evaluated | 10,406 |
Allowance for credit losses: Collectively evaluated | 118,765 | 110,057
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 | 36,133 | 39,278
Reserve for unfunded lending commitments: Beginning balance | 309 | 327
Reserve for unfunded lending commitments: Provision for losses | (13) | (40)
Reserve for unfunded lending commitments: Ending balance | 296 | 287
Total allowance for credit losses | 36,429 | 39,565
Allowance for credit losses: Individually evaluated | 49 |
Allowance for credit losses: Collectively evaluated | 36,380 | 39,565
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 | (8,873) | (9,630)
Allowance for loan losses: Recoveries | 1,745 | 13,206
Allowance for loan losses: Net provision for loan losses | 8,122 | (1,874)
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 | (6,132) | (9,630)
Allowance for loan losses: Recoveries | 1,650 | 13,104
Allowance for loan losses: Net provision for loan losses | 5,607 | (853)
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 | (2,741) |
Allowance for loan losses: Recoveries | 95 | 102
Allowance for loan losses: Net provision for loan losses | 2,515 | (1,021)
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 | 43,200 | 41,158
Reserve for unfunded lending commitments: Beginning balance | 4 | 30
Reserve for unfunded lending commitments: Provision for losses | (1) | (8)
Reserve for unfunded lending commitments: Ending balance | 3 | 22
Total allowance for credit losses | 43,203 | 41,180
Allowance for credit losses: Individually evaluated | 752 |
Allowance for credit losses: Collectively evaluated | 42,451 | 41,180
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (167) | (56)
Allowance for loan losses: Recoveries | 387 | 202
Allowance for loan losses: Net provision for loan losses | 535 | 2,029
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 | 25,984 | 25,217
Reserve for unfunded lending commitments: Beginning balance | 2,018 | 1,667
Reserve for unfunded lending commitments: Provision for losses | (21) | (8)
Reserve for unfunded lending commitments: Ending balance | 1,997 | 1,659
Total allowance for credit losses | 27,981 | 26,876
Allowance for credit losses: Individually evaluated | 197 |
Allowance for credit losses: Collectively evaluated | 27,784 | 26,876
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for loan losses: Charge-offs | (4,211) | (4,786)
Allowance for loan losses: Recoveries | 804 | 914
Allowance for loan losses: Net provision for loan losses | $ 3,441 | $ 3,677

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