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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Net Loans and Leases |  |  |  | $ 28,656,355 | $ 25,299,564 |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases acquired with deteriorated credit quality |  |  |  | 225,141 | 223,712 |  |
PCI Loans |  |  |  | 558,716 | 606,576 | $ 762,998 | $ 809,169
Commercial |  |  |  |  |  |  |
Loan and Lease Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |  |
PCI Loans |  |  |  | 284,329 | 296,672 |  |
Non-PCI Loans |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 214,568 | $ 211,867 | $ 205,026 |  |  |  |
Provisions | 33,049 | 29,232 | 29,139 |  |  |  |
Charge-offs | (43,027) | (39,554) | (36,386) |  |  |  |
Recoveries | 13,015 | 13,023 | 14,088 |  |  |  |
Ending balance | 217,605 | 214,568 | 211,867 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 12,915 | 9,827 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 204,690 | 204,741 |  |
Total allowance for loan and lease losses | 217,605 | 214,568 | 211,867 | 217,605 | 214,568 | 211,867 | 205,026
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 185,599 | 146,430 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 28,137,181 | 24,770,270 |  |
Net Loans and Leases |  |  |  | 28,322,780 | 24,916,700 |  |
Non-PCI Loans | Commercial |  |  |  |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 5,634 | 4,445 |  |
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 88,893 | 68,641 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 35,270 | 24,470 | 28,877 |  |  |  |
Provisions | (2,171) | 10,533 | (4,329) |  |  |  |
Charge-offs | (196) | (44) | (599) |  |  |  |
Recoveries | 310 | 311 | 521 |  |  |  |
Ending balance | 33,213 | 35,270 | 24,470 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 463 | 490 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 32,750 | 34,780 |  |
Total allowance for loan and lease losses | 33,213 | 35,270 | 24,470 | 33,213 | 35,270 | 24,470 | 28,877
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 4,655 | 2,175 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 1,008,799 | 755,679 |  |
Net Loans and Leases |  |  |  | 1,013,454 | 757,854 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 43,451 | 45,005 | 48,278 |  |  |  |
Provisions | 2,384 | (1,490) | (5,694) |  |  |  |
Charge-offs | (1,096) | (1,140) | (421) |  |  |  |
Recoveries | 596 | 1,076 | 2,842 |  |  |  |
Ending balance | 45,335 | 43,451 | 45,005 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 3,650 | 2,671 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 41,685 | 40,780 |  |
Total allowance for loan and lease losses | 45,335 | 43,451 | 45,005 | 45,335 | 43,451 | 45,005 | 48,278
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 70,149 | 55,447 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 12,212,486 | 10,661,787 |  |
Net Loans and Leases |  |  |  | 12,282,635 | 10,717,234 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2,481 | 4,571 | 3,269 |  |  |  |
Provisions | (285) | (2,171) | 1,280 |  |  |  |
Charge-offs | 0 | (69) | (5) |  |  |  |
Recoveries | 15 | 150 | 27 |  |  |  |
Ending balance | 2,211 | 2,481 | 4,571 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 39 | 42 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 2,172 | 2,439 |  |
Total allowance for loan and lease losses | 2,211 | 2,481 | 4,571 | 2,211 | 2,481 | 4,571 | 3,269
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 1,268 | 860 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 540,760 | 426,125 |  |
Net Loans and Leases |  |  |  | 542,028 | 426,985 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 55,620 | 59,824 | 56,132 |  |  |  |
Provisions | 14,212 | 2,511 | 11,624 |  |  |  |
Charge-offs | (13,352) | (10,211) | (11,921) |  |  |  |
Recoveries | 2,894 | 3,496 | 3,989 |  |  |  |
Ending balance | 59,374 | 55,620 | 59,824 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 1,379 | 1,137 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 57,995 | 54,483 |  |
Total allowance for loan and lease losses | 55,620 | 55,620 | 59,824 | 59,374 | 55,620 | 59,824 | 56,132
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 12,182 | 9,868 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 4,391,610 | 3,928,862 |  |
Net Loans and Leases |  |  |  | 4,403,792 | 3,938,730 |  |
Non-PCI Loans | Commercial | Other |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2,221 | 4,689 | 3,127 |  |  |  |
Provisions | (754) | (2,827) | 2,189 |  |  |  |
Charge-offs | (100) | (130) | (912) |  |  |  |
Recoveries | 869 | 489 | 285 |  |  |  |
Ending balance | 2,236 | 2,221 | 4,689 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 103 | 105 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 2,133 | 2,116 |  |
Total allowance for loan and lease losses | 2,236 | 2,221 | 4,689 | 2,236 | 2,221 | 4,689 | 3,127
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 639 | 291 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 309,454 | 296,133 |  |
Net Loans and Leases |  |  |  | 310,093 | 296,424 |  |
Non-PCI Loans | Noncommercial |  |  |  |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 7,281 | 5,382 |  |
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 96,706 | 77,789 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2,350 | 3,962 | 1,596 |  |  |  |
Provisions | 359 | (1,520) | 2,366 |  |  |  |
Charge-offs | 0 | (219) | 0 |  |  |  |
Recoveries | 0 | 127 | 0 |  |  |  |
Ending balance | 2,709 | 2,350 | 3,962 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 174 | 81 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 2,535 | 2,269 |  |
Total allowance for loan and lease losses | 2,709 | 2,350 | 3,962 | 2,709 | 2,350 | 3,962 | 1,596
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 3,882 | 3,749 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 353,503 | 253,281 |  |
Net Loans and Leases |  |  |  | 357,385 | 257,030 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 15,472 | 15,706 | 14,447 |  |  |  |
Provisions | 3,481 | 897 | 2,096 |  |  |  |
Charge-offs | (1,137) | (1,689) | (1,376) |  |  |  |
Recoveries | 416 | 558 | 539 |  |  |  |
Ending balance | 18,232 | 15,472 | 15,706 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 3,278 | 1,901 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 14,954 | 13,571 |  |
Total allowance for loan and lease losses | 15,472 | 15,472 | 15,706 | 18,232 | 15,472 | 15,706 | 14,447
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 60,442 | 42,168 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 5,233,475 | 4,223,519 |  |
Net Loans and Leases |  |  |  | 5,293,917 | 4,265,687 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 21,862 | 22,436 | 21,013 |  |  |  |
Provisions | (788) | 1,112 | 2,509 |  |  |  |
Charge-offs | (2,584) | (3,235) | (2,368) |  |  |  |
Recoveries | 1,212 | 1,549 | 1,282 |  |  |  |
Ending balance | 19,702 | 21,862 | 22,436 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 2,722 | 2,515 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 16,980 | 19,347 |  |
Total allowance for loan and lease losses | 21,862 | 21,862 | 22,436 | 19,702 | 21,862 | 22,436 | 21,013
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 28,869 | 28,852 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 2,310,203 | 2,514,123 |  |
Net Loans and Leases |  |  |  | 2,339,072 | 2,542,975 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 35,841 | 31,204 | 28,287 |  |  |  |
Provisions | 16,611 | 22,187 | 17,098 |  |  |  |
Charge-offs | (24,562) | (22,817) | (18,784) |  |  |  |
Recoveries | 6,703 | 5,267 | 4,603 |  |  |  |
Ending balance | 34,593 | 35,841 | 31,204 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
ALLL for loans and leases individually evaluated for impairment |  |  |  | 1,107 | 885 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  |  | 33,486 | 34,956 |  |
Total allowance for loan and lease losses | 35,841 | 35,841 | 31,204 | 34,593 | 35,841 | 31,204 | 28,287
Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  |  | 3,513 | 3,020 |  |
Loans and leases collectively evaluated for impairment |  |  |  | 1,776,891 | 1,710,761 |  |
Net Loans and Leases |  |  |  | 1,780,404 | 1,713,781 |  |
PCI Loans |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 9,144 | 10,026 | 13,769 |  |  |  |
Provisions | (1,608) | (765) | (3,447) |  |  |  |
Charge-offs | 0 | (117) | (296) |  |  |  |
Recoveries | 0 | 0 | 0 |  |  |  |
Ending balance | 7,536 | 9,144 | 10,026 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |  |
Total allowance for loan and lease losses | $ 7,536 | $ 10,026 | $ 10,026 | $ 7,536 | $ 9,144 | $ 10,026 | $ 13,769

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were 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=82894507&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 (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: 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=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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