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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | $ 342,065 | $ 450,177 |
Allowance for loan losses: Net provision for loan losses | (28,399) | (77,494) | $ 602,904
Allowance for loan losses: Ending balance | 307,789 | 342,065 | 450,177
Reserve for unfunded lending commitments: Beginning balance | 29,334 | 29,907 | 3,974
Reserve for unfunded lending commitments: Provision for losses | 3,975 | (573) |
Reserve for unfunded lending commitments: Ending balance | 33,309 | 29,334 | 29,907
Total allowance for credit losses | 341,098 | 371,399 |
Allowance for loan losses: Individually evaluated | 476 | 903 |
Allowance for loan losses: Collectively evaluated | 307,313 | 341,162 |
Reserve for unfunded lending commitments: Collectively evaluated | 33,309 | 29,334 |
Loans: Individually evaluated for impairment | 7,515 | 17,882 |
Loans: Collectively evaluated for impairment | 23,106,531 | 21,116,400 |
Total loans | 23,114,046 | 21,134,282 |
Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (22,590) | (50,836) |
Allowance for loan losses: Recoveries | 20,688 | 19,645 |
Allowance for loan losses: Net provision for loan losses | (32,374) | (76,921) |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 149,321 | 218,827 |
Allowance for loan losses: Ending balance | 144,745 | 149,321 | 218,827
Reserve for unfunded lending commitments: Beginning balance | 4,845 | 4,910 |
Reserve for unfunded lending commitments: Provision for losses | 441 | (65) |
Reserve for unfunded lending commitments: Ending balance | 5,286 | 4,845 | 4,910
Total allowance for credit losses | 150,031 | 154,166 |
Allowance for loan losses: Individually evaluated | 102 | 271 |
Allowance for loan losses: Collectively evaluated | 144,643 | 149,050 |
Reserve for unfunded lending commitments: Collectively evaluated | 5,286 | 4,845 |
Loans: Individually evaluated for impairment | 2,168 | 5,977 |
Loans: Collectively evaluated for impairment | 13,177,343 | 12,427,729 |
Total loans | 13,179,511 | 12,433,706 |
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (8,585) | (36,702) |
Allowance for loan losses: Recoveries | 12,545 | 9,627 |
Allowance for loan losses: Net provision for loan losses | (8,536) | (42,431) |
Total Commercial [Member] | Commercial Non-Real Estate [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 95,888 | 149,693 |
Allowance for loan losses: Ending balance | 96,461 | 95,888 | 149,693
Reserve for unfunded lending commitments: Beginning balance | 4,522 | 4,529 |
Reserve for unfunded lending commitments: Provision for losses | 462 | (7) |
Reserve for unfunded lending commitments: Ending balance | 4,984 | 4,522 | 4,529
Total allowance for credit losses | 101,445 | 100,410 |
Allowance for loan losses: Individually evaluated | 71 | 177 |
Allowance for loan losses: Collectively evaluated | 96,390 | 95,711 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,984 | 4,522 |
Loans: Individually evaluated for impairment | 1,248 | 3,431 |
Loans: Collectively evaluated for impairment | 10,145,205 | 9,609,029 |
Total loans | 10,146,453 | 9,612,460 |
Total Commercial [Member] | Commercial Non-Real Estate [Member] | Non-Purchased Credit Impaired Loans [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (7,637) | (33,523) |
Allowance for loan losses: Recoveries | 11,812 | 8,985 |
Allowance for loan losses: Net provision for loan losses | (3,602) | (29,267) |
Total Commercial [Member] | Commercial Real Estate - Owner Occupied | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 53,433 | 69,134 |
Allowance for loan losses: Ending balance | 48,284 | 53,433 | 69,134
Reserve for unfunded lending commitments: Beginning balance | 323 | 381 |
Reserve for unfunded lending commitments: Provision for losses | (21) | (58) |
Reserve for unfunded lending commitments: Ending balance | 302 | 323 | 381
Total allowance for credit losses | 48,586 | 53,756 |
Allowance for loan losses: Individually evaluated | 31 | 94 |
Allowance for loan losses: Collectively evaluated | 48,253 | 53,339 |
Reserve for unfunded lending commitments: Collectively evaluated | 302 | 323 |
Loans: Individually evaluated for impairment | 920 | 2,546 |
Loans: Collectively evaluated for impairment | 3,032,138 | 2,818,700 |
Total loans | 3,033,058 | 2,821,246 |
Total Commercial [Member] | Commercial Real Estate - Owner Occupied | Non-Purchased Credit Impaired Loans [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (948) | (3,179) |
Allowance for loan losses: Recoveries | 733 | 642 |
Allowance for loan losses: Net provision for loan losses | (4,934) | (13,164) |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 108,058 | 109,474 |
Allowance for loan losses: Ending balance | 71,961 | 108,058 | 109,474
Reserve for unfunded lending commitments: Beginning balance | 1,694 | 1,099 |
Reserve for unfunded lending commitments: Provision for losses | (299) | 595 |
Reserve for unfunded lending commitments: Ending balance | 1,395 | 1,694 | 1,099
Total allowance for credit losses | 73,356 | 109,752 |
Allowance for loan losses: Individually evaluated | 16 | 20 |
Allowance for loan losses: Collectively evaluated | 71,945 | 108,038 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,395 | 1,694 |
Loans: Individually evaluated for impairment | 1,240 | 5,288 |
Loans: Collectively evaluated for impairment | 3,559,751 | 3,459,338 |
Total loans | 3,560,991 | 3,464,626 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (1,073) | (425) |
Allowance for loan losses: Recoveries | 878 | 105 |
Allowance for loan losses: Net provision for loan losses | (35,902) | (1,096) |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 22,102 | 26,462 |
Allowance for loan losses: Ending balance | 30,498 | 22,102 | 26,462
Reserve for unfunded lending commitments: Beginning balance | 21,907 | 22,694 |
Reserve for unfunded lending commitments: Provision for losses | 3,203 | (787) |
Reserve for unfunded lending commitments: Ending balance | 25,110 | 21,907 | 22,694
Total allowance for credit losses | 55,608 | 44,009 |
Allowance for loan losses: Individually evaluated | 18 | 20 |
Allowance for loan losses: Collectively evaluated | 30,480 | 22,082 |
Reserve for unfunded lending commitments: Collectively evaluated | 25,110 | 21,907 |
Loans: Individually evaluated for impairment | 116 | 125 |
Loans: Collectively evaluated for impairment | 1,703,476 | 1,228,545 |
Total loans | 1,703,592 | 1,228,670 |
Total Commercial [Member] | Construction and Land Development [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (3) | (274) |
Allowance for loan losses: Recoveries | 134 | 2,172 |
Allowance for loan losses: Net provision for loan losses | 8,265 | (6,258) |
Residential Mortgages [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 30,623 | 48,842 |
Allowance for loan losses: Ending balance | 32,464 | 30,623 | 48,842
Reserve for unfunded lending commitments: Beginning balance | 22 | 19 |
Reserve for unfunded lending commitments: Provision for losses | 9 | 3 |
Reserve for unfunded lending commitments: Ending balance | 31 | 22 | 19
Total allowance for credit losses | 32,495 | 30,645 |
Allowance for loan losses: Individually evaluated | 239 | 408 |
Allowance for loan losses: Collectively evaluated | 32,225 | 30,215 |
Reserve for unfunded lending commitments: Collectively evaluated | 31 | 22 |
Loans: Individually evaluated for impairment | 3,476 | 5,260 |
Loans: Collectively evaluated for impairment | 3,089,129 | 2,418,630 |
Total loans | 3,092,605 | 2,423,890 |
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (137) | (713) |
Allowance for loan losses: Recoveries | 1,749 | 1,459 |
Allowance for loan losses: Net provision for loan losses | 229 | (18,965) |
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 31,961 | 46,572 |
Allowance for loan losses: Ending balance | 28,121 | 31,961 | 46,572
Reserve for unfunded lending commitments: Beginning balance | 866 | 1,185 |
Reserve for unfunded lending commitments: Provision for losses | 621 | (319) |
Reserve for unfunded lending commitments: Ending balance | 1,487 | 866 | $ 1,185
Total allowance for credit losses | 29,608 | 32,827 |
Allowance for loan losses: Individually evaluated | 101 | 184 |
Allowance for loan losses: Collectively evaluated | 28,020 | 31,777 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,487 | 866 |
Loans: Individually evaluated for impairment | 515 | 1,232 |
Loans: Collectively evaluated for impairment | 1,576,832 | 1,582,158 |
Total loans | 1,577,347 | 1,583,390 |
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Charge-offs | (12,792) | (12,722) |
Allowance for loan losses: Recoveries | 5,382 | 6,282 |
Allowance for loan losses: Net provision for loan losses | $ 3,570 | $ (8,171) |

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