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Allowance for Loan and Lease Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Net loans and leases |  |  | $ 25,235,010 | $ 25,299,564 |  |
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |
Loans and leases acquired with deteriorated credit quality |  |  | 557,356 | 606,576 | $ 703,837 | $ 762,998
Commercial |  |  |  |  |  |
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |
Loans and leases acquired with deteriorated credit quality |  |  | 269,913 | 296,672 |  |
Noncommercial |  |  |  |  |  |
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |
Loans and leases acquired with deteriorated credit quality |  |  | 287,443 |  |  |
Noncommercial | Mortgage |  |  |  |  |  |
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |
Loans and leases acquired with deteriorated credit quality |  |  |  | 309,904 |  |
Non-PCI Loans |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 214,568 | $ 211,867 |  |  |  |
Provision for Loan, Lease, and Other Losses | 11,914 | 5,251 |  |  |  |
Charge-offs | (10,154) | (9,613) |  |  |  |
Recoveries | 3,467 | 3,315 |  |  |  |
Ending balance | 219,795 | 210,820 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 150,001 | 146,430 |  |
Loans and leases collectively evaluated for impairment |  |  | 24,756,428 | 24,770,270 |  |
Net loans and leases |  |  | 24,906,429 | 24,916,700 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 11,965 | 9,827 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 207,830 | 204,741 |  |
Total allowance for loan and lease losses | 214,568 | 211,867 | 219,795 | 214,568 | 210,820 | 211,867
Non-PCI Loans | Commercial | Construction and land development |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 35,270 | 24,470 |  |  |  |
Provision for Loan, Lease, and Other Losses | 2,119 | 2,225 |  |  |  |
Charge-offs | (44) | 0 |  |  |  |
Recoveries | 131 | 23 |  |  |  |
Ending balance | 37,476 | 26,718 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 2,123 | 2,175 |  |
Loans and leases collectively evaluated for impairment |  |  | 802,340 | 755,679 |  |
Net loans and leases |  |  | 804,463 | 757,854 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 533 | 490 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 36,943 | 34,780 |  |
Total allowance for loan and lease losses | 35,270 | 24,470 | 37,476 | 35,270 | 26,718 | 24,470
Non-PCI Loans | Commercial | Mortgage |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 43,451 | 45,005 |  |  |  |
Provision for Loan, Lease, and Other Losses | 2,371 | (1,365) |  |  |  |
Charge-offs | (761) | (46) |  |  |  |
Recoveries | 220 | 239 |  |  |  |
Ending balance | 45,281 | 43,833 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 56,157 | 55,447 |  |
Loans and leases collectively evaluated for impairment |  |  | 10,691,558 | 10,661,787 |  |
Net loans and leases |  |  | 10,747,715 | 10,717,234 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 2,949 | 2,671 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 42,332 | 40,780 |  |
Total allowance for loan and lease losses | 43,451 | 45,005 | 45,281 | 43,451 | 43,833 | 45,005
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 2,481 | 4,571 |  |  |  |
Provision for Loan, Lease, and Other Losses | (83) | (1,293) |  |  |  |
Charge-offs | 0 | 0 |  |  |  |
Recoveries | 1 | 145 |  |  |  |
Ending balance | 2,399 | 3,423 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 541 | 860 |  |
Loans and leases collectively evaluated for impairment |  |  | 426,878 | 426,125 |  |
Net loans and leases |  |  | 427,419 | 426,985 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 16 | 42 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,383 | 2,439 |  |
Total allowance for loan and lease losses | 2,481 | 4,571 | 2,399 | 2,481 | 3,423 | 4,571
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 55,620 | 59,824 |  |  |  |
Provision for Loan, Lease, and Other Losses | 2,725 | 562 |  |  |  |
Charge-offs | (1,858) | (2,329) |  |  |  |
Recoveries | 538 | 1,260 |  |  |  |
Ending balance | 57,025 | 59,317 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 9,987 | 9,868 |  |
Loans and leases collectively evaluated for impairment |  |  | 3,869,588 | 3,928,862 |  |
Net loans and leases |  |  | 3,879,575 | 3,938,730 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 1,420 | 1,137 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 55,605 | 54,483 |  |
Total allowance for loan and lease losses | 55,620 | 59,824 | 57,025 | 55,620 | 59,317 | 59,824
Non-PCI Loans | Commercial | Other |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 2,221 | 4,689 |  |  |  |
Provision for Loan, Lease, and Other Losses | (498) | 114 |  |  |  |
Charge-offs | 0 | (3) |  |  |  |
Recoveries | 444 | 42 |  |  |  |
Ending balance | 2,167 | 4,842 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 337 | 291 |  |
Loans and leases collectively evaluated for impairment |  |  | 280,511 | 296,133 |  |
Net loans and leases |  |  | 280,848 | 296,424 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 151 | 105 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,016 | 2,116 |  |
Total allowance for loan and lease losses | 2,221 | 4,689 | 2,167 | 2,221 | 4,842 | 4,689
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 2,350 | 3,962 |  |  |  |
Provision for Loan, Lease, and Other Losses | 123 | 107 |  |  |  |
Charge-offs | 0 | (182) |  |  |  |
Recoveries | 0 | 26 |  |  |  |
Ending balance | 2,473 | 3,913 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 3,742 | 3,749 |  |
Loans and leases collectively evaluated for impairment |  |  | 255,217 | 253,281 |  |
Net loans and leases |  |  | 258,959 | 257,030 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 99 | 81 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 2,374 | 2,269 |  |
Total allowance for loan and lease losses | 2,350 | 3,962 | 2,473 | 2,350 | 3,913 | 3,962
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 15,472 | 15,706 |  |  |  |
Provision for Loan, Lease, and Other Losses | 1,508 | 1,512 |  |  |  |
Charge-offs | (166) | (806) |  |  |  |
Recoveries | 173 | 77 |  |  |  |
Ending balance | 16,987 | 16,489 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 44,944 | 42,168 |  |
Loans and leases collectively evaluated for impairment |  |  | 4,258,193 | 4,223,519 |  |
Net loans and leases |  |  | 4,303,137 | 4,265,687 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 3,149 | 1,901 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 13,838 | 13,571 |  |
Total allowance for loan and lease losses | 15,472 | 15,706 | 16,987 | 15,472 | 16,489 | 15,706
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 21,862 | 22,436 |  |  |  |
Provision for Loan, Lease, and Other Losses | 209 | 466 |  |  |  |
Charge-offs | (963) | (992) |  |  |  |
Recoveries | 387 | 194 |  |  |  |
Ending balance | 21,495 | 22,104 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 29,216 | 28,852 |  |
Loans and leases collectively evaluated for impairment |  |  | 2,440,682 | 2,514,123 |  |
Net loans and leases |  |  | 2,469,898 | 2,542,975 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 2,742 | 2,515 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 18,753 | 19,347 |  |
Total allowance for loan and lease losses | 21,862 | 22,436 | 21,495 | 21,862 | 22,104 | 22,436
Non-PCI Loans | Noncommercial | Consumer |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 35,841 | 31,204 |  |  |  |
Provision for Loan, Lease, and Other Losses | 3,440 | 2,923 |  |  |  |
Charge-offs | (6,362) | (5,255) |  |  |  |
Recoveries | 1,573 | 1,309 |  |  |  |
Ending balance | 34,492 | 30,181 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Loans and leases individually evaluated for impairment |  |  | 2,954 | 3,020 |  |
Loans and leases collectively evaluated for impairment |  |  | 1,731,461 | 1,710,761 |  |
Net loans and leases |  |  | 1,734,415 | 1,713,781 |  |
ALLL for loans and leases individually evaluated for impairment |  |  | 906 | 885 |  |
ALLL for loans and leases collectively evaluated for impairment |  |  | 33,586 | 34,956 |  |
Total allowance for loan and lease losses | 35,841 | 31,204 | 34,492 | 35,841 | 30,181 | 31,204
PCI Loans |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 9,144 | 10,026 |  |  |  |
Provision for Loan, Lease, and Other Losses | (164) | 2,354 |  |  |  |
Charge-offs | 0 | (84) |  |  |  |
Recoveries | 0 | 0 |  |  |  |
Ending balance | 8,980 | 12,296 |  |  |  |
Allowance for Loans and Leases Evaluated for Impairment [Abstract] |  |  |  |  |  |
Total allowance for loan and lease losses | $ 9,144 | $ 10,026 | 8,980 | $ 9,144 | $ 12,296 | $ 10,026
Loan and Leases Acquired with Deteriorated Credit Quality [Abstract] |  |  |  |  |  |
Loans and leases acquired with deteriorated credit quality |  |  | $ 557,356 |  |  |

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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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