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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | $ 191,251 | $ 194,514 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 27,330 |  |
Allowance for loan losses: Net provision for loan losses | 602,904 | 47,708 | $ 36,116
Allowance for loan losses: Ending balance | 450,177 | 191,251 | 194,514
Reserve for unfunded lending commitments: Beginning balance | 3,974 |  |
Reserve for unfunded lending commitments: Provision for losses | (1,397) | 3,974 |
Reserve for unfunded lending commitments: Ending balance | 29,907 | 3,974 |
Total allowance for credit losses | 480,084 | 195,225 |
Allowance for loan losses: Individually evaluated | 13,880 | 22,385 |
Allowance for loan losses: Collectively evaluated | 436,297 | 160,609 |
Reserve for unfunded lending commitments: Individually evaluated | 241 | 3,974 |
Reserve for unfunded lending commitments: Collectively evaluated | 29,666 |  |
Loans: Individually evaluated for impairment | 68,144 | 245,651 |
Loans: Collectively evaluated for impairment | 21,721,787 | 20,751,859 |
Loans receivable | 21,789,931 | 21,212,755 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 8,257 |
Loans: Purchased credit impaired loans |  | 215,245 |
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 | (409,457) | (59,077) |
Allowance for loan losses: Recoveries | 14,671 | 12,080 |
Allowance for loan losses: Net provision for loan losses | 604,301 | 43,734 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 20,869 | 17,638 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 449 |  |
Allowance for loan losses: Ending balance | 109,474 | 20,869 | 17,638
Reserve for unfunded lending commitments: Provision for losses | 650 |  |
Reserve for unfunded lending commitments: Ending balance | 1,099 |  |
Total allowance for credit losses | 110,573 | 20,869 |
Allowance for loan losses: Individually evaluated | 44 | 18 |
Allowance for loan losses: Collectively evaluated | 109,430 | 20,812 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,099 |  |
Loans: Individually evaluated for impairment | 4,542 | 1,898 |
Loans: Collectively evaluated for impairment | 3,353,397 | 2,957,197 |
Loans receivable | 3,357,939 | 2,994,448 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 39 |
Loans: Purchased credit impaired loans |  | 35,353 |
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: Cumulative effect of change in accounting principle | 7,287 |  |
Allowance for loan losses: Charge-offs | (2,512) | (32) |
Allowance for loan losses: Recoveries | 46 | 569 |
Allowance for loan losses: Net provision for loan losses | 83,784 | 2,694 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 9,350 | 15,647 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 15,658 |  |
Allowance for loan losses: Ending balance | 26,462 | 9,350 | 15,647
Reserve for unfunded lending commitments: Provision for losses | 7,036 |  |
Reserve for unfunded lending commitments: Ending balance | 22,694 |  |
Total allowance for credit losses | 49,156 | 9,350 |
Allowance for loan losses: Individually evaluated | 22 | 21 |
Allowance for loan losses: Collectively evaluated | 26,440 | 9,193 |
Reserve for unfunded lending commitments: Collectively evaluated | 22,694 |  |
Loans: Individually evaluated for impairment | 1,250 | 277 |
Loans: Collectively evaluated for impairment | 1,063,807 | 1,136,658 |
Loans receivable | 1,065,057 | 1,157,451 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 136 |
Loans: Purchased credit impaired loans |  | 20,516 |
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: Cumulative effect of change in accounting principle | 7,478 |  |
Allowance for loan losses: Charge-offs | (400) | (7) |
Allowance for loan losses: Recoveries | 846 | 140 |
Allowance for loan losses: Net provision for loan losses | 9,188 | (6,430) |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 117,409 | 111,509 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 6,060 |  |
Allowance for loan losses: Ending balance | 218,827 | 117,409 | 111,509
Reserve for unfunded lending commitments: Beginning balance | 3,974 |  |
Reserve for unfunded lending commitments: Provision for losses | (5,124) | 3,974 |
Reserve for unfunded lending commitments: Ending balance | 4,910 | 3,974 |
Total allowance for credit losses | 223,737 | 121,383 |
Allowance for loan losses: Individually evaluated | 12,753 | 21,837 |
Allowance for loan losses: Collectively evaluated | 206,074 | 95,239 |
Reserve for unfunded lending commitments: Individually evaluated | 241 | 3,974 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,669 |  |
Loans: Individually evaluated for impairment | 53,981 | 236,819 |
Loans: Collectively evaluated for impairment | 12,790,447 | 11,601,315 |
Loans receivable | 12,844,428 | 11,905,407 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 333 |
Loans: Purchased credit impaired loans |  | 67,273 |
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 | (389,000) | (39,737) |
Allowance for loan losses: Recoveries | 6,795 | 7,246 |
Allowance for loan losses: Net provision for loan losses | 468,990 | 38,391 |
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 | 106,432 | 97,752 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 5,772 |  |
Allowance for loan losses: Ending balance | 149,693 | 106,432 | 97,752
Reserve for unfunded lending commitments: Beginning balance | 3,974 |  |
Reserve for unfunded lending commitments: Provision for losses | (5,217) | 3,974 |
Reserve for unfunded lending commitments: Ending balance | 4,529 | 3,974 |
Total allowance for credit losses | 154,222 | 110,406 |
Allowance for loan losses: Individually evaluated | 11,517 | 21,733 |
Allowance for loan losses: Collectively evaluated | 138,176 | 84,535 |
Reserve for unfunded lending commitments: Individually evaluated | 241 | 3,974 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,288 |  |
Loans: Individually evaluated for impairment | 43,775 | 232,438 |
Loans: Collectively evaluated for impairment | 9,943,208 | 8,903,436 |
Loans receivable | 9,986,983 | 9,166,947 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 164 |
Loans: Purchased credit impaired loans |  | 31,073 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [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 | (244) |  |
Allowance for loan losses: Charge-offs | (387,172) | (39,600) |
Allowance for loan losses: Recoveries | 6,032 | 6,940 |
Allowance for loan losses: Net provision for loan losses | 424,645 | 41,340 |
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 | 10,977 | 13,757 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 288 |  |
Allowance for loan losses: Ending balance | 69,134 | 10,977 | 13,757
Reserve for unfunded lending commitments: Provision for losses | 93 |  |
Reserve for unfunded lending commitments: Ending balance | 381 |  |
Total allowance for credit losses | 69,515 | 10,977 |
Allowance for loan losses: Individually evaluated | 1,236 | 104 |
Allowance for loan losses: Collectively evaluated | 67,898 | 10,704 |
Reserve for unfunded lending commitments: Collectively evaluated | 381 |  |
Loans: Individually evaluated for impairment | 10,206 | 4,381 |
Loans: Collectively evaluated for impairment | 2,847,239 | 2,697,879 |
Loans receivable | 2,857,445 | 2,738,460 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 169 |
Loans: Purchased credit impaired loans |  | 36,200 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate Owner Occupied | 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 | 14,877 |  |
Allowance for loan losses: Charge-offs | (1,828) | (137) |
Allowance for loan losses: Recoveries | 763 | 306 |
Allowance for loan losses: Net provision for loan losses | 44,345 | (2,949) |
Residential Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 20,331 | 23,782 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 17 |  |
Allowance for loan losses: Ending balance | 48,842 | 20,331 | 23,782
Reserve for unfunded lending commitments: Provision for losses | 2 |  |
Reserve for unfunded lending commitments: Ending balance | 19 |  |
Total allowance for credit losses | 48,861 | 20,331 |
Allowance for loan losses: Individually evaluated | 546 | 217 |
Allowance for loan losses: Collectively evaluated | 48,296 | 12,640 |
Reserve for unfunded lending commitments: Collectively evaluated | 19 |  |
Loans: Individually evaluated for impairment | 5,850 | 5,174 |
Loans: Collectively evaluated for impairment | 2,659,362 | 2,898,700 |
Loans receivable | 2,665,212 | 2,990,631 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 7,474 |
Loans: Purchased credit impaired loans |  | 86,757 |
Residential Portfolio Segment | 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 | (326) | (846) |
Allowance for loan losses: Recoveries | 1,400 | 480 |
Allowance for loan losses: Net provision for loan losses | 14,516 | (3,085) |
Consumer Portfolio Segment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses: Beginning balance | 23,292 | 25,938 |
Allowance for loan losses: Cumulative effect of change in accounting principle | 5,146 |  |
Allowance for loan losses: Ending balance | 46,572 | 23,292 | $ 25,938
Reserve for unfunded lending commitments: Provision for losses | (3,961) |  |
Reserve for unfunded lending commitments: Ending balance | 1,185 |  |
Total allowance for credit losses | 47,757 | 23,292 |
Allowance for loan losses: Individually evaluated | 515 | 292 |
Allowance for loan losses: Collectively evaluated | 46,057 | 22,725 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,185 |  |
Loans: Individually evaluated for impairment | 2,521 | 1,483 |
Loans: Collectively evaluated for impairment | 1,854,774 | 2,157,989 |
Loans receivable | 1,857,295 | 2,164,818 |
Allowance for loan losses: Amounts related to purchased credit impaired loans |  | 275 |
Loans: Purchased credit impaired loans |  | 5,346 |
Consumer Portfolio Segment | 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 | (17,219) | (18,455) |
Allowance for loan losses: Recoveries | 5,584 | 3,645 |
Allowance for loan losses: Net provision for loan losses | $ 27,823 | $ 12,164 |

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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