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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
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 | $ (9,761) | $ (17,229) | (32,288) | (22,140) |
Allowance for loan losses: Ending balance | 308,175 | 399,668 | 308,175 | 399,668 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 29,334 | 29,907 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 1,969 | 383 |
Reserve for unfunded lending commitments: Ending balance | 31,303 | 29,524 | 31,303 | 29,524 |
Total allowance for credit losses | 339,478 | 429,192 | 339,478 | 429,192 |
Allowance for loan losses: Individually evaluated | 636 | 4,027 | 636 | 4,027 |
Allowance for loan losses: Collectively evaluated | 307,539 | 395,641 | 307,539 | 395,641 |
Reserve for unfunded lending commitments: Individually evaluated |  | 241 |  | 241 |
Reserve for unfunded lending commitments: Collectively evaluated | 31,303 | 29,283 | 31,303 | 29,283 |
Loans: Individually evaluated for impairment | 8,801 | 33,878 | 8,801 | 33,878 |
Loans: Collectively evaluated for impairment | 21,837,267 | 21,114,652 | 21,837,267 | 21,114,652 |
Loans receivable | 21,846,068 | 21,148,530 | 21,846,068 | 21,148,530 | $ 21,134,282
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (11,360) | (37,926) |
Allowance for loan losses: Recoveries |  |  | 11,727 | 9,174 |
Allowance for loan losses: Net provision for loan losses |  |  | (34,257) | (21,757) |
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 | 82,951 | 123,780 | 82,951 | 123,780 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,694 | 1,099 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 274 | 244 |
Reserve for unfunded lending commitments: Ending balance | 1,420 | 1,343 | 1,420 | 1,343 |
Total allowance for credit losses | 84,371 | 125,123 | 84,371 | 125,123 |
Allowance for loan losses: Individually evaluated | 18 | 21 | 18 | 21 |
Allowance for loan losses: Collectively evaluated | 82,933 | 123,759 | 82,933 | 123,759 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,420 | 1,343 | 1,420 | 1,343 |
Loans: Individually evaluated for impairment | 1,289 | 4,018 | 1,289 | 4,018 |
Loans: Collectively evaluated for impairment | 3,639,954 | 3,415,010 | 3,639,954 | 3,415,010 |
Loans receivable | 3,641,243 | 3,419,028 | 3,641,243 | 3,419,028 | 3,464,626
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 | 24,703 | 26,728 | 24,703 | 26,728 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 21,907 | 22,694 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 1,598 | (1,470) |
Reserve for unfunded lending commitments: Ending balance | 23,505 | 21,224 | 23,505 | 21,224 |
Total allowance for credit losses | 48,208 | 47,952 | 48,208 | 47,952 |
Allowance for loan losses: Individually evaluated | 19 | 21 | 19 | 21 |
Allowance for loan losses: Collectively evaluated | 24,684 | 26,707 | 24,684 | 26,707 |
Reserve for unfunded lending commitments: Collectively evaluated | 23,505 | 21,224 | 23,505 | 21,224 |
Loans: Individually evaluated for impairment | 120 | 129 | 120 | 129 |
Loans: Collectively evaluated for impairment | 1,408,607 | 1,294,907 | 1,408,607 | 1,294,907 |
Loans receivable | 1,408,727 | 1,295,036 | 1,408,727 | 1,295,036 | 1,228,670
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 |  |  | (1,066) | (231) |
Allowance for loan losses: Recoveries |  |  | 878 |  |
Allowance for loan losses: Net provision for loan losses |  |  | (24,919) | 14,537 |
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 |  |  | (3) | (256) |
Allowance for loan losses: Recoveries |  |  | 126 | 1,164 |
Allowance for loan losses: Net provision for loan losses |  |  | (2,478) | (642) |
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 | 142,434 | 174,295 | 142,434 | 174,295 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,845 | 4,910 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (91) | 1,101 |
Reserve for unfunded lending commitments: Ending balance | 4,936 | 6,011 | 4,936 | 6,011 |
Total allowance for credit losses | 147,370 | 180,306 | 147,370 | 180,306 |
Allowance for loan losses: Individually evaluated | 107 | 3,344 | 107 | 3,344 |
Allowance for loan losses: Collectively evaluated | 142,327 | 170,951 | 142,327 | 170,951 |
Reserve for unfunded lending commitments: Individually evaluated |  | 241 |  | 241 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,936 | 5,770 | 4,936 | 5,770 |
Loans: Individually evaluated for impairment | 2,496 | 20,721 | 2,496 | 20,721 |
Loans: Collectively evaluated for impairment | 12,607,070 | 12,321,857 | 12,607,070 | 12,321,857 |
Loans receivable | 12,609,566 | 12,342,578 | 12,609,566 | 12,342,578 | 12,433,706
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 |  |  | 95,888 | 149,693 |
Allowance for loan losses: Ending balance | 92,819 | 112,523 | 92,819 | 112,523 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,522 | 4,529 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (51) | 1,174 |
Reserve for unfunded lending commitments: Ending balance | 4,573 | 5,703 | 4,573 | 5,703 |
Total allowance for credit losses | 97,392 | 118,226 | 97,392 | 118,226 |
Allowance for loan losses: Individually evaluated | 76 | 2,675 | 76 | 2,675 |
Allowance for loan losses: Collectively evaluated | 92,743 | 109,848 | 92,743 | 109,848 |
Reserve for unfunded lending commitments: Individually evaluated |  | 241 |  | 241 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,573 | 5,462 | 4,573 | 5,462 |
Loans: Individually evaluated for impairment | 1,559 | 13,642 | 1,559 | 13,642 |
Loans: Collectively evaluated for impairment | 9,643,533 | 9,519,068 | 9,643,533 | 9,519,068 |
Loans receivable | 9,645,092 | 9,532,710 | 9,645,092 | 9,532,710 | 9,612,460
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [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 | 49,615 | 61,772 | 49,615 | 61,772 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 323 | 381 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 40 | 73 |
Reserve for unfunded lending commitments: Ending balance | 363 | 308 | 363 | 308 |
Total allowance for credit losses | 49,978 | 62,080 | 49,978 | 62,080 |
Allowance for loan losses: Individually evaluated | 31 | 669 | 31 | 669 |
Allowance for loan losses: Collectively evaluated | 49,584 | 61,103 | 49,584 | 61,103 |
Reserve for unfunded lending commitments: Collectively evaluated | 363 | 308 | 363 | 308 |
Loans: Individually evaluated for impairment | 937 | 7,079 | 937 | 7,079 |
Loans: Collectively evaluated for impairment | 2,963,537 | 2,802,789 | 2,963,537 | 2,802,789 |
Loans receivable | 2,964,474 | 2,809,868 | 2,964,474 | 2,809,868 | 2,821,246
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 |  |  | (4,604) | (30,614) |
Allowance for loan losses: Recoveries |  |  | 7,094 | 4,474 |
Allowance for loan losses: Net provision for loan losses |  |  | (9,377) | (18,392) |
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 |  |  | (3,747) | (28,932) |
Allowance for loan losses: Recoveries |  |  | 6,603 | 4,187 |
Allowance for loan losses: Net provision for loan losses |  |  | (5,925) | (12,425) |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (857) | (1,682) |
Allowance for loan losses: Recoveries |  |  | 491 | 287 |
Allowance for loan losses: Net provision for loan losses |  |  | (3,452) | (5,967) |
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 | 28,584 | 36,465 | 28,584 | 36,465 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 22 | 19 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (2) | 6 |
Reserve for unfunded lending commitments: Ending balance | 24 | 13 | 24 | 13 |
Total allowance for credit losses | 28,608 | 36,478 | 28,608 | 36,478 |
Allowance for loan losses: Individually evaluated | 322 | 437 | 322 | 437 |
Allowance for loan losses: Collectively evaluated | 28,262 | 36,028 | 28,262 | 36,028 |
Reserve for unfunded lending commitments: Collectively evaluated | 24 | 13 | 24 | 13 |
Loans: Individually evaluated for impairment | 3,991 | 6,347 | 3,991 | 6,347 |
Loans: Collectively evaluated for impairment | 2,611,816 | 2,406,112 | 2,611,816 | 2,406,112 |
Loans receivable | 2,615,807 | 2,412,459 | 2,615,807 | 2,412,459 | 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 |  |  | (60) | (207) |
Allowance for loan losses: Recoveries |  |  | 527 | 437 |
Allowance for loan losses: Net provision for loan losses |  |  | (2,506) | (12,607) |
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 | 29,503 | 38,400 | 29,503 | 38,400 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 866 | 1,185 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 552 | 252 |
Reserve for unfunded lending commitments: Ending balance | 1,418 | 933 | 1,418 | 933 |
Total allowance for credit losses | 30,921 | 39,333 | 30,921 | 39,333 |
Allowance for loan losses: Individually evaluated | 170 | 204 | 170 | 204 |
Allowance for loan losses: Collectively evaluated | 29,333 | 38,196 | 29,333 | 38,196 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,418 | 933 | 1,418 | 933 |
Loans: Individually evaluated for impairment | 905 | 2,663 | 905 | 2,663 |
Loans: Collectively evaluated for impairment | 1,569,820 | 1,676,766 | 1,569,820 | 1,676,766 |
Loans receivable | $ 1,570,725 | $ 1,679,429 | 1,570,725 | 1,679,429 | $ 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 |  |  | (5,627) | (6,618) |
Allowance for loan losses: Recoveries |  |  | 3,102 | 3,099 |
Allowance for loan losses: Net provision for loan losses |  |  | $ (67) | $ 4,653 |

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