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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 450,177 | $ 191,251 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 27,330 |
Allowance for loan losses: Net provision for loan losses | $ (26,955) | $ 24,999 | (49,095) | 578,690 |
Allowance for loan losses: Ending balance | 371,521 | 448,674 | 371,521 | 448,674 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 29,907 | 3,974 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (961) | 222 |
Reserve for unfunded lending commitments: Ending balance | 28,946 | 31,526 | 28,946 | 31,526 |
Total allowance for credit losses | 400,467 | 480,200 | 400,467 | 480,200 |
Allowance for loan losses: Individually evaluated | 835 | 29,713 | 835 | 29,713 |
Allowance for loan losses: Collectively evaluated | 370,686 | 418,961 | 370,686 | 418,961 |
Reserve for unfunded lending commitments: Individually evaluated |  | 997 |  | 997 |
Reserve for unfunded lending commitments: Collectively evaluated | 28,946 | 30,529 | 28,946 | 30,529 |
Loans: Individually evaluated for impairment | 22,076 | 101,637 | 22,076 | 101,637 |
Loans: Collectively evaluated for impairment | 20,863,939 | 22,138,567 | 20,863,939 | 22,138,567 |
Loans receivable | 20,886,015 | 22,240,204 | 20,886,015 | 22,240,204 | $ 21,789,931
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 49,411 |
Allowance for loan losses: Charge-offs |  |  | (44,681) | (381,979) |
Allowance for loan losses: Recoveries |  |  | 14,159 | 11,523 |
Allowance for loan losses: Net provision for loan losses |  |  | (48,134) | 578,468 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 109,474 | 20,869 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 449 |
Allowance for loan losses: Ending balance | 121,095 | 104,652 | 121,095 | 104,652 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,099 |  |
Reserve for unfunded lending commitments: Provision for losses |  |  | 124 | 1,599 |
Reserve for unfunded lending commitments: Ending balance | 1,223 | 2,048 | 1,223 | 2,048 |
Total allowance for credit losses | 122,318 | 106,700 | 122,318 | 106,700 |
Allowance for loan losses: Individually evaluated | 20 | 24 | 20 | 24 |
Allowance for loan losses: Collectively evaluated | 121,075 | 104,628 | 121,075 | 104,628 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,223 | 2,048 | 1,223 | 2,048 |
Loans: Individually evaluated for impairment | 4,004 | 5,549 | 4,004 | 5,549 |
Loans: Collectively evaluated for impairment | 3,463,935 | 3,401,005 | 3,463,935 | 3,401,005 |
Loans receivable | 3,467,939 | 3,406,554 | 3,467,939 | 3,406,554 | 3,357,939
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 26,462 | 9,350 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 15,658 |
Allowance for loan losses: Ending balance | 22,576 | 29,695 | 22,576 | 29,695 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 22,694 |  |
Reserve for unfunded lending commitments: Provision for losses |  |  | (383) | 6,046 |
Reserve for unfunded lending commitments: Ending balance | 22,311 | 21,704 | 22,311 | 21,704 |
Total allowance for credit losses | 44,887 | 51,399 | 44,887 | 51,399 |
Allowance for loan losses: Individually evaluated | 20 | 169 | 20 | 169 |
Allowance for loan losses: Collectively evaluated | 22,556 | 29,526 | 22,556 | 29,526 |
Reserve for unfunded lending commitments: Collectively evaluated | 22,311 | 21,704 | 22,311 | 21,704 |
Loans: Individually evaluated for impairment | 127 | 1,837 | 127 | 1,837 |
Loans: Collectively evaluated for impairment | 1,213,864 | 1,094,312 | 1,213,864 | 1,094,312 |
Loans receivable | 1,213,991 | 1,096,149 | 1,213,991 | 1,096,149 | 1,065,057
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: Cumulative effect of change in accounting principle |  |  |  | 7,287 |
Allowance for loan losses: Charge-offs |  |  | (231) | (2,211) |
Allowance for loan losses: Recoveries |  |  | 100 | 46 |
Allowance for loan losses: Net provision for loan losses |  |  | 11,752 | 78,661 |
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: Cumulative effect of change in accounting principle |  |  |  | 7,478 |
Allowance for loan losses: Charge-offs |  |  | (267) | (7) |
Allowance for loan losses: Recoveries |  |  | 1,548 | 549 |
Allowance for loan losses: Net provision for loan losses |  |  | (5,167) | 12,325 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 218,827 | 117,409 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 6,060 |
Allowance for loan losses: Ending balance | 163,442 | 214,072 | 163,442 | 214,072 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,910 | 3,974 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (307) | (3,599) |
Reserve for unfunded lending commitments: Ending balance | 4,603 | 6,435 | 4,603 | 6,435 |
Total allowance for credit losses | 168,045 | 220,507 | 168,045 | 220,507 |
Allowance for loan losses: Individually evaluated | 146 | 28,648 | 146 | 28,648 |
Allowance for loan losses: Collectively evaluated | 163,296 | 185,424 | 163,296 | 185,424 |
Reserve for unfunded lending commitments: Individually evaluated |  | 992 |  | 992 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,603 | 5,443 | 4,603 | 5,443 |
Loans: Individually evaluated for impairment | 11,547 | 84,263 | 11,547 | 84,263 |
Loans: Collectively evaluated for impairment | 12,218,369 | 12,952,932 | 12,218,369 | 12,952,932 |
Loans receivable | 12,229,916 | 13,037,195 | 12,229,916 | 13,037,195 | 12,844,428
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 |  |  | 149,693 | 106,432 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 5,772 |
Allowance for loan losses: Ending balance | 106,309 | 148,051 | 106,309 | 148,051 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,529 | 3,974 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (176) | (3,786) |
Reserve for unfunded lending commitments: Ending balance | 4,353 | 5,960 | 4,353 | 5,960 |
Total allowance for credit losses | 110,662 | 154,011 | 110,662 | 154,011 |
Allowance for loan losses: Individually evaluated | 113 | 27,304 | 113 | 27,304 |
Allowance for loan losses: Collectively evaluated | 106,196 | 120,747 | 106,196 | 120,747 |
Reserve for unfunded lending commitments: Individually evaluated |  | 992 |  | 992 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,353 | 4,968 | 4,353 | 4,968 |
Loans: Individually evaluated for impairment | 5,929 | 73,139 | 5,929 | 73,139 |
Loans: Collectively evaluated for impairment | 9,411,061 | 10,184,649 | 9,411,061 | 10,184,649 |
Loans receivable | 9,416,990 | 10,257,788 | 9,416,990 | 10,257,788 | 9,986,983
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 |  |  | 69,134 | 10,977 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 288 |
Allowance for loan losses: Ending balance | 57,133 | 66,021 | 57,133 | 66,021 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 381 |  |
Reserve for unfunded lending commitments: Provision for losses |  |  | (131) | 187 |
Reserve for unfunded lending commitments: Ending balance | 250 | 475 | 250 | 475 |
Total allowance for credit losses | 57,383 | 66,496 | 57,383 | 66,496 |
Allowance for loan losses: Individually evaluated | 33 | 1,344 | 33 | 1,344 |
Allowance for loan losses: Collectively evaluated | 57,100 | 64,677 | 57,100 | 64,677 |
Reserve for unfunded lending commitments: Collectively evaluated | 250 | 475 | 250 | 475 |
Loans: Individually evaluated for impairment | 5,618 | 11,124 | 5,618 | 11,124 |
Loans: Collectively evaluated for impairment | 2,807,308 | 2,768,283 | 2,807,308 | 2,768,283 |
Loans receivable | 2,812,926 | 2,779,407 | 2,812,926 | 2,779,407 | 2,857,445
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: Cumulative effect of change in accounting principle |  |  |  | 14,633 |
Allowance for loan losses: Charge-offs |  |  | (34,091) | (365,951) |
Allowance for loan losses: Recoveries |  |  | 6,942 | 5,490 |
Allowance for loan losses: Net provision for loan losses |  |  | (28,236) | 442,491 |
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: Cumulative effect of change in accounting principle |  |  |  | (244) |
Allowance for loan losses: Charge-offs |  |  | (32,369) | (364,123) |
Allowance for loan losses: Recoveries |  |  | 6,579 | 4,831 |
Allowance for loan losses: Net provision for loan losses |  |  | (17,594) | 401,155 |
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: Cumulative effect of change in accounting principle |  |  |  | 14,877 |
Allowance for loan losses: Charge-offs |  |  | (1,722) | (1,828) |
Allowance for loan losses: Recoveries |  |  | 363 | 659 |
Allowance for loan losses: Net provision for loan losses |  |  | (10,642) | 41,336 |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 48,842 | 20,331 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 17 |
Allowance for loan losses: Ending balance | 31,073 | 51,773 | 31,073 | 51,773 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 19 |  |
Reserve for unfunded lending commitments: Provision for losses |  |  | (8) | (11) |
Reserve for unfunded lending commitments: Ending balance | 11 | 6 | 11 | 6 |
Total allowance for credit losses | 31,084 | 51,779 | 31,084 | 51,779 |
Allowance for loan losses: Individually evaluated | 447 | 416 | 447 | 416 |
Allowance for loan losses: Collectively evaluated | 30,626 | 51,357 | 30,626 | 51,357 |
Reserve for unfunded lending commitments: Collectively evaluated | 11 | 6 | 11 | 6 |
Loans: Individually evaluated for impairment | 5,083 | 6,064 | 5,083 | 6,064 |
Loans: Collectively evaluated for impairment | 2,345,970 | 2,748,324 | 2,345,970 | 2,748,324 |
Loans receivable | 2,351,053 | 2,754,388 | 2,351,053 | 2,754,388 | 2,665,212
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 12,921 |
Allowance for loan losses: Charge-offs |  |  | (218) | (170) |
Allowance for loan losses: Recoveries |  |  | 933 | 1,078 |
Allowance for loan losses: Net provision for loan losses |  |  | (18,484) | 17,613 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 46,572 | 23,292 |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 5,146 |
Allowance for loan losses: Ending balance | 33,335 | 48,482 | 33,335 | 48,482 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,185 |  |
Reserve for unfunded lending commitments: Provision for losses |  |  | (387) | (3,813) |
Reserve for unfunded lending commitments: Ending balance | 798 | 1,333 | 798 | 1,333 |
Total allowance for credit losses | 34,133 | 49,815 | 34,133 | 49,815 |
Allowance for loan losses: Individually evaluated | 202 | 456 | 202 | 456 |
Allowance for loan losses: Collectively evaluated | 33,133 | 48,026 | 33,133 | 48,026 |
Reserve for unfunded lending commitments: Individually evaluated |  | 5 |  | 5 |
Reserve for unfunded lending commitments: Collectively evaluated | 798 | 1,328 | 798 | 1,328 |
Loans: Individually evaluated for impairment | 1,315 | 3,924 | 1,315 | 3,924 |
Loans: Collectively evaluated for impairment | 1,621,801 | 1,941,994 | 1,621,801 | 1,941,994 |
Loans receivable | $ 1,623,116 | $ 1,945,918 | 1,623,116 | 1,945,918 | $ 1,857,295
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Cumulative effect of change in accounting principle |  |  |  | 7,092 |
Allowance for loan losses: Charge-offs |  |  | (9,874) | (13,640) |
Allowance for loan losses: Recoveries |  |  | 4,636 | 4,360 |
Allowance for loan losses: Net provision for loan losses |  |  | $ (7,999) | $ 27,378 |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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