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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 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 | $ 1,402 | $ (26,955) | (30,886) | (49,095) |
Allowance for loan losses: Ending balance | 306,116 | 371,521 | 306,116 | 371,521 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 29,334 | 29,907 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 4,134 | 961 |
Reserve for unfunded lending commitments: Ending balance | 33,468 | 28,946 | 33,468 | 28,946 |
Total allowance for credit losses | 339,584 | 400,467 | 339,584 | 400,467 |
Allowance for loan losses: Individually evaluated | 516 | 835 | 516 | 835 |
Allowance for loan losses: Collectively evaluated | 305,600 | 370,686 | 305,600 | 370,686 |
Reserve for unfunded lending commitments: Individually evaluated | 3 |  | 3 |  |
Reserve for unfunded lending commitments: Collectively evaluated | 33,465 | 28,946 | 33,465 | 28,946 |
Loans: Individually evaluated for impairment | 7,806 | 22,076 | 7,806 | 22,076 |
Loans: Collectively evaluated for impairment | 22,577,779 | 20,863,939 | 22,577,779 | 20,863,939 |
Loans receivable | 22,585,585 | 20,886,015 | 22,585,585 | 20,886,015 | $ 21,134,282
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (17,947) | (44,681) |
Allowance for loan losses: Recoveries |  |  | 17,018 | 14,159 |
Allowance for loan losses: Net provision for loan losses |  |  | (35,020) | (48,134) |
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 | 77,412 | 121,095 | 77,412 | 121,095 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,694 | 1,099 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 205 | 124 |
Reserve for unfunded lending commitments: Ending balance | 1,489 | 1,223 | 1,489 | 1,223 |
Total allowance for credit losses | 78,901 | 122,318 | 78,901 | 122,318 |
Allowance for loan losses: Individually evaluated | 17 | 20 | 17 | 20 |
Allowance for loan losses: Collectively evaluated | 77,395 | 121,075 | 77,395 | 121,075 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,489 | 1,223 | 1,489 | 1,223 |
Loans: Individually evaluated for impairment | 1,270 | 4,004 | 1,270 | 4,004 |
Loans: Collectively evaluated for impairment | 3,685,270 | 3,463,935 | 3,685,270 | 3,463,935 |
Loans receivable | 3,686,540 | 3,467,939 | 3,686,540 | 3,467,939 | 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 | 26,747 | 22,576 | 26,747 | 22,576 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 21,907 | 22,694 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 3,602 | (383) |
Reserve for unfunded lending commitments: Ending balance | 25,509 | 22,311 | 25,509 | 22,311 |
Total allowance for credit losses | 52,256 | 44,887 | 52,256 | 44,887 |
Allowance for loan losses: Individually evaluated | 19 | 20 | 19 | 20 |
Allowance for loan losses: Collectively evaluated | 26,728 | 22,556 | 26,728 | 22,556 |
Reserve for unfunded lending commitments: Collectively evaluated | 25,509 | 22,311 | 25,509 | 22,311 |
Loans: Individually evaluated for impairment | 118 | 127 | 118 | 127 |
Loans: Collectively evaluated for impairment | 1,541,139 | 1,213,864 | 1,541,139 | 1,213,864 |
Loans receivable | 1,541,257 | 1,213,991 | 1,541,257 | 1,213,991 | 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 | 100 |
Allowance for loan losses: Net provision for loan losses |  |  | (30,458) | 11,752 |
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) | (267) |
Allowance for loan losses: Recoveries |  |  | 132 | 1,548 |
Allowance for loan losses: Net provision for loan losses |  |  | (4,516) | (5,167) |
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 | 142,823 | 163,442 | 142,823 | 163,442 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,845 | 4,910 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (248) | 307 |
Reserve for unfunded lending commitments: Ending balance | 5,093 | 4,603 | 5,093 | 4,603 |
Total allowance for credit losses | 147,916 | 168,045 | 147,916 | 168,045 |
Allowance for loan losses: Individually evaluated | 102 | 146 | 102 | 146 |
Allowance for loan losses: Collectively evaluated | 142,721 | 163,296 | 142,721 | 163,296 |
Reserve for unfunded lending commitments: Individually evaluated | 3 |  | 3 |  |
Reserve for unfunded lending commitments: Collectively evaluated | 5,090 | 4,603 | 5,090 | 4,603 |
Loans: Individually evaluated for impairment | 2,211 | 11,547 | 2,211 | 11,547 |
Loans: Collectively evaluated for impairment | 12,936,349 | 12,218,369 | 12,936,349 | 12,218,369 |
Loans receivable | 12,938,560 | 12,229,916 | 12,938,560 | 12,229,916 | 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 | 94,806 | 106,309 | 94,806 | 106,309 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,522 | 4,529 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (238) | 176 |
Reserve for unfunded lending commitments: Ending balance | 4,760 | 4,353 | 4,760 | 4,353 |
Total allowance for credit losses | 99,566 | 110,662 | 99,566 | 110,662 |
Allowance for loan losses: Individually evaluated | 71 | 113 | 71 | 113 |
Allowance for loan losses: Collectively evaluated | 94,735 | 106,196 | 94,735 | 106,196 |
Reserve for unfunded lending commitments: Individually evaluated | 3 |  | 3 |  |
Reserve for unfunded lending commitments: Collectively evaluated | 4,757 | 4,353 | 4,757 | 4,353 |
Loans: Individually evaluated for impairment | 1,282 | 5,929 | 1,282 | 5,929 |
Loans: Collectively evaluated for impairment | 9,904,145 | 9,411,061 | 9,904,145 | 9,411,061 |
Loans receivable | 9,905,427 | 9,416,990 | 9,905,427 | 9,416,990 | 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 | 48,017 | 57,133 | 48,017 | 57,133 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 323 | 381 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 10 | 131 |
Reserve for unfunded lending commitments: Ending balance | 333 | 250 | 333 | 250 |
Total allowance for credit losses | 48,350 | 57,383 | 48,350 | 57,383 |
Allowance for loan losses: Individually evaluated | 31 | 33 | 31 | 33 |
Allowance for loan losses: Collectively evaluated | 47,986 | 57,100 | 47,986 | 57,100 |
Reserve for unfunded lending commitments: Collectively evaluated | 333 | 250 | 333 | 250 |
Loans: Individually evaluated for impairment | 929 | 5,618 | 929 | 5,618 |
Loans: Collectively evaluated for impairment | 3,032,204 | 2,807,308 | 3,032,204 | 2,807,308 |
Loans receivable | 3,033,133 | 2,812,926 | 3,033,133 | 2,812,926 | 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 |  |  | (7,312) | (34,091) |
Allowance for loan losses: Recoveries |  |  | 10,066 | 6,942 |
Allowance for loan losses: Net provision for loan losses |  |  | (9,252) | (28,236) |
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 |  |  | (6,366) | (32,369) |
Allowance for loan losses: Recoveries |  |  | 9,460 | 6,579 |
Allowance for loan losses: Net provision for loan losses |  |  | (4,176) | (17,594) |
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 |  |  | (946) | (1,722) |
Allowance for loan losses: Recoveries |  |  | 606 | 363 |
Allowance for loan losses: Net provision for loan losses |  |  | (5,076) | (10,642) |
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 | 30,947 | 31,073 | 30,947 | 31,073 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 22 | 19 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (5) | 8 |
Reserve for unfunded lending commitments: Ending balance | 17 | 11 | 17 | 11 |
Total allowance for credit losses | 30,964 | 31,084 | 30,964 | 31,084 |
Allowance for loan losses: Individually evaluated | 276 | 447 | 276 | 447 |
Allowance for loan losses: Collectively evaluated | 30,671 | 30,626 | 30,671 | 30,626 |
Reserve for unfunded lending commitments: Collectively evaluated | 17 | 11 | 17 | 11 |
Loans: Individually evaluated for impairment | 3,680 | 5,083 | 3,680 | 5,083 |
Loans: Collectively evaluated for impairment | 2,840,043 | 2,345,970 | 2,840,043 | 2,345,970 |
Loans receivable | 2,843,723 | 2,351,053 | 2,843,723 | 2,351,053 | 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 |  |  | (102) | (218) |
Allowance for loan losses: Recoveries |  |  | 1,463 | 933 |
Allowance for loan losses: Net provision for loan losses |  |  | (1,037) | (18,484) |
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 | 28,187 | 33,335 | 28,187 | 33,335 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 866 | 1,185 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 494 | 387 |
Reserve for unfunded lending commitments: Ending balance | 1,360 | 798 | 1,360 | 798 |
Total allowance for credit losses | 29,547 | 34,133 | 29,547 | 34,133 |
Allowance for loan losses: Individually evaluated | 102 | 202 | 102 | 202 |
Allowance for loan losses: Collectively evaluated | 28,085 | 33,133 | 28,085 | 33,133 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,360 | 798 | 1,360 | 798 |
Loans: Individually evaluated for impairment | 527 | 1,315 | 527 | 1,315 |
Loans: Collectively evaluated for impairment | 1,574,978 | 1,621,801 | 1,574,978 | 1,621,801 |
Loans receivable | $ 1,575,505 | $ 1,623,116 | 1,575,505 | 1,623,116 | $ 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 |  |  | (9,464) | (9,874) |
Allowance for loan losses: Recoveries |  |  | 4,479 | 4,636 |
Allowance for loan losses: Net provision for loan losses |  |  | $ (1,211) | $ 7,999 |

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