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Loans and Leases (Tables) | 3 Months Ended
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Mar. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |
Loans And Leases Outstanding | Loans and leases outstanding included the following at March 31, 2018 and December 31, 2017:
(Dollars in thousands) | March 31, 2018 |  | December 31, 2017
Non-PCI loans and leases: |  |  |
Commercial: |  |  |
Construction and land development | $ | 738,413 |  |  | $ | 669,215 |
Commercial mortgage | 9,859,136 |  |  | 9,729,022 |
Other commercial real estate | 386,734 |  |  | 473,433 |
Commercial and industrial | 2,695,205 |  |  | 2,730,407 |
Lease financing | 910,589 |  |  | 894,801 |
Other | 281,485 |  |  | 302,176 |
Total commercial loans | 14,871,562 |  |  | 14,799,054 |
Noncommercial: |  |  |
Residential mortgage | 3,587,791 |  |  | 3,523,786 |
Revolving mortgage | 2,651,648 |  |  | 2,701,525 |
Construction and land development | 243,114 |  |  | 248,289 |
Consumer | 1,554,025 |  |  | 1,561,173 |
Total noncommercial loans | 8,036,578 |  |  | 8,034,773 |
Total non-PCI loans and leases | 22,908,140 |  |  | 22,833,827 |
PCI loans: |  |  |
Commercial: |  |  |
Construction and land development | 9,316 |  |  | 10,135 |
Commercial mortgage | 325,073 |  |  | 358,103 |
Other commercial real estate | 16,179 |  |  | 17,124 |
Commercial and industrial | 3,732 |  |  | 6,374 |
Other | 1,628 |  |  | 1,683 |
Total commercial loans | 355,928 |  |  | 393,419 |
Noncommercial: |  |  |
Residential mortgage | 282,338 |  |  | 299,318 |
Revolving mortgage | 60,388 |  |  | 63,908 |
Construction and land development | 3,006 |  |  | 4,163 |
Consumer | 2,177 |  |  | 2,190 |
Total noncommercial loans | 347,909 |  |  | 369,579 |
Total PCI loans | 703,837 |  |  | 762,998 |
Total loans and leases | $ | 23,611,977 |  |  | $ | 23,596,825 |
Composition Of The Loans And Leases Outstanding By Credit Quality Indicator | Non-PCI loans and leases outstanding at March 31, 2018 and December 31, 2017 by credit quality indicator are provided below:
| March 31, 2018
(Dollars in thousands) | Non-PCI commercial loans and leases
Grade: | Construction and land development |  | Commercial mortgage |  | Other commercial real estate |  | Commercial and industrial |  | Lease financing |  | Other |  | Total non-PCI commercial loans and leases
Pass | $ | 733,253 |  |  | $ | 9,661,079 |  |  | $ | 382,679 |  |  | $ | 2,476,337 |  |  | $ | 900,464 |  |  | $ | 278,367 |  |  | $ | 14,432,179 |
Special mention | 483 |  |  | 81,680 |  |  | 1,187 |  |  | 37,571 |  |  | 3,347 |  |  | 1,107 |  |  | 125,375 |
Substandard | 4,639 |  |  | 115,039 |  |  | 2,868 |  |  | 19,357 |  |  | 6,734 |  |  | 1,889 |  |  | 150,526 |
Doubtful | — |  |  | 1,338 |  |  | — |  |  | 836 |  |  | — |  |  | 72 |  |  | 2,246 |
Ungraded | 38 |  |  | — |  |  | — |  |  | 161,104 |  |  | 44 |  |  | 50 |  |  | 161,236 |
Total | $ | 738,413 |  |  | $ | 9,859,136 |  |  | $ | 386,734 |  |  | $ | 2,695,205 |  |  | $ | 910,589 |  |  | $ | 281,485 |  |  | $ | 14,871,562 |
| December 31, 2017
| Non-PCI commercial loans and leases
| Construction and land development |  | Commercial mortgage |  | Other commercial real estate |  | Commercial and industrial |  | Lease financing |  | Other |  | Total non-PCI commercial loans and leases
Pass | $ | 665,197 |  |  | $ | 9,521,019 |  |  | $ | 468,942 |  |  | $ | 2,511,307 |  |  | $ | 883,779 |  |  | $ | 298,064 |  |  | $ | 14,348,308 |
Special mention | 691 |  |  | 78,643 |  |  | 1,260 |  |  | 44,130 |  |  | 4,340 |  |  | 2,919 |  |  | 131,983 |
Substandard | 3,327 |  |  | 128,848 |  |  | 3,224 |  |  | 18,617 |  |  | 6,585 |  |  | 1,193 |  |  | 161,794 |
Doubtful | — |  |  | 262 |  |  | — |  |  | 385 |  |  | — |  |  | — |  |  | 647 |
Ungraded | — |  |  | 250 |  |  | 7 |  |  | 155,968 |  |  | 97 |  |  | — |  |  | 156,322 |
Total | $ | 669,215 |  |  | $ | 9,729,022 |  |  | $ | 473,433 |  |  | $ | 2,730,407 |  |  | $ | 894,801 |  |  | $ | 302,176 |  |  | $ | 14,799,054 |
| March 31, 2018
| Non-PCI noncommercial loans and leases
(Dollars in thousands) | Residential mortgage |  | Revolving mortgage |  | Construction and land development |  | Consumer |  | Total non-PCI noncommercial loans and leases
Current | $ | 3,542,327 |  |  | $ | 2,628,122 |  |  | $ | 239,107 |  |  | $ | 1,541,749 |  |  | $ | 7,951,305 |
30-59 days past due | 23,833 |  |  | 9,364 |  |  | 2,885 |  |  | 6,935 |  |  | 43,017 |
60-89 days past due | 2,429 |  |  | 3,636 |  |  | — |  |  | 2,440 |  |  | 8,505 |
90 days or greater past due | 19,202 |  |  | 10,526 |  |  | 1,122 |  |  | 2,901 |  |  | 33,751 |
Total | $ | 3,587,791 |  |  | $ | 2,651,648 |  |  | $ | 243,114 |  |  | $ | 1,554,025 |  |  | $ | 8,036,578 |
| December 31, 2017
| Non-PCI noncommercial loans and leases
| Residential mortgage |  | Revolving mortgage |  | Construction and land development |  | Consumer |  | Total non-PCI noncommercial loans and leases
Current | $ | 3,465,935 |  |  | $ | 2,674,390 |  |  | $ | 239,648 |  |  | $ | 1,546,473 |  |  | $ | 7,926,446 |
30-59 days past due | 27,886 |  |  | 13,428 |  |  | 7,154 |  |  | 8,812 |  |  | 57,280 |
60-89 days past due | 8,064 |  |  | 3,485 |  |  | 108 |  |  | 2,893 |  |  | 14,550 |
90 days or greater past due | 21,901 |  |  | 10,222 |  |  | 1,379 |  |  | 2,995 |  |  | 36,497 |
Total | $ | 3,523,786 |  |  | $ | 2,701,525 |  |  | $ | 248,289 |  |  | $ | 1,561,173 |  |  | $ | 8,034,773 |
PCI loans outstanding at March 31, 2018 and December 31, 2017 by credit quality indicator are provided below:
| March 31, 2018
(Dollars in thousands) | PCI commercial loans
Grade: | Construction and land development |  | Commercial mortgage |  | Other commercial real estate |  | Commercial and industrial |  | Other |  | Total PCI commercial loans
Pass | $ | 3,691 |  |  | $ | 157,187 |  |  | $ | 12,739 |  |  | $ | 1,642 |  |  | $ | 254 |  |  | $ | 175,513 |
Special mention | 338 |  |  | 61,443 |  |  | 307 |  |  | 488 |  |  | 928 |  |  | 63,504 |
Substandard | 4,231 |  |  | 101,734 |  |  | 2,615 |  |  | 1,492 |  |  | 446 |  |  | 110,518 |
Doubtful | 1,056 |  |  | 4,709 |  |  | 518 |  |  | 81 |  |  | — |  |  | 6,364 |
Ungraded | — |  |  | — |  |  | — |  |  | 29 |  |  | — |  |  | 29 |
Total | $ | 9,316 |  |  | $ | 325,073 |  |  | $ | 16,179 |  |  | $ | 3,732 |  |  | $ | 1,628 |  |  | $ | 355,928 |
| December 31, 2017
| PCI commercial loans
| Construction and land development |  | Commercial mortgage |  | Other commercial real estate |  | Commercial and industrial |  | Other |  | Total PCI commercial loans
Pass | $ | 1,817 |  |  | $ | 181,353 |  |  | $ | 13,830 |  |  | $ | 4,057 |  |  | $ | 275 |  |  | $ | 201,332 |
Special mention | 320 |  |  | 61,295 |  |  | 323 |  |  | 374 |  |  | 945 |  |  | 63,257 |
Substandard | 5,792 |  |  | 106,807 |  |  | 2,163 |  |  | 1,843 |  |  | 463 |  |  | 117,068 |
Doubtful | 2,206 |  |  | 8,648 |  |  | 808 |  |  | 73 |  |  | — |  |  | 11,735 |
Ungraded | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | 27 |
Total | $ | 10,135 |  |  | $ | 358,103 |  |  | $ | 17,124 |  |  | $ | 6,374 |  |  | $ | 1,683 |  |  | $ | 393,419 |
| March 31, 2018
| PCI noncommercial loans
(Dollars in thousands) | Residential mortgage |  | Revolving mortgage |  | Construction and land development |  | Consumer |  | Total PCI noncommercial loans
Current | $ | 249,443 |  |  | $ | 53,885 |  |  | $ | 2,420 |  |  | $ | 2,095 |  |  | $ | 307,843 |
30-59 days past due | 9,196 |  |  | 1,662 |  |  | 19 |  |  | 40 |  |  | 10,917 |
60-89 days past due | 1,436 |  |  | 851 |  |  | — |  |  | — |  |  | 2,287 |
90 days or greater past due | 22,263 |  |  | 3,990 |  |  | 567 |  |  | 42 |  |  | 26,862 |
Total | $ | 282,338 |  |  | $ | 60,388 |  |  | $ | 3,006 |  |  | $ | 2,177 |  |  | $ | 347,909 |
| December 31, 2017
| PCI noncommercial loans
| Residential mortgage |  | Revolving mortgage |  | Construction and land development |  | Consumer |  | Total PCI noncommercial loans
Current | $ | 257,166 |  |  | $ | 55,871 |  |  | $ | 3,521 |  |  | $ | 2,074 |  |  | $ | 318,632 |
30-59 days past due | 10,525 |  |  | 2,767 |  |  | — |  |  | 51 |  |  | 13,343 |
60-89 days past due | 4,846 |  |  | 701 |  |  | 642 |  |  | 23 |  |  | 6,212 |
90 days or greater past due | 26,781 |  |  | 4,569 |  |  | — |  |  | 42 |  |  | 31,392 |
Total | $ | 299,318 |  |  | $ | 63,908 |  |  | $ | 4,163 |  |  | $ | 2,190 |  |  | $ | 369,579 |
Aging Of The Outstanding Loans And Leases By Class Excluding Loans Impaired At Acquisition Date | The aging of the outstanding non-PCI loans and leases, by class, at March 31, 2018 and December 31, 2017 is provided in the table below. The calculation of days past due begins on the day after payment is due and includes all days through which all required interest or principal has not been paid. Loans and leases 30 days or less past due are considered current as various grace periods allow borrowers to make payments within a stated period after the due date and still remain in compliance with the loan agreement.
| March 31, 2018
(Dollars in thousands) | 30-59 days past due |  | 60-89 days past due |  | 90 days or greater |  | Total past due |  | Current |  | Total loans and leases
Non-PCI loans and leases: |  |  |  |  |  |  |  |  |  |  |
Construction and land development - commercial | $ | 2,011 |  |  | $ | 771 |  |  | $ | 357 |  |  | $ | 3,139 |  |  | $ | 735,274 |  |  | $ | 738,413 |
Commercial mortgage | 9,813 |  |  | 4,738 |  |  | 7,058 |  |  | 21,609 |  |  | 9,837,527 |  |  | 9,859,136 |
Other commercial real estate | 94 |  |  | 22 |  |  | 73 |  |  | 189 |  |  | 386,545 |  |  | 386,734 |
Commercial and industrial | 8,273 |  |  | 1,844 |  |  | 1,503 |  |  | 11,620 |  |  | 2,683,585 |  |  | 2,695,205 |
Lease financing | 3,677 |  |  | 45 |  |  | 1,512 |  |  | 5,234 |  |  | 905,355 |  |  | 910,589 |
Residential mortgage | 23,833 |  |  | 2,429 |  |  | 19,202 |  |  | 45,464 |  |  | 3,542,327 |  |  | 3,587,791 |
Revolving mortgage | 9,364 |  |  | 3,636 |  |  | 10,526 |  |  | 23,526 |  |  | 2,628,122 |  |  | 2,651,648 |
Construction and land development - noncommercial | 2,885 |  |  | — |  |  | 1,122 |  |  | 4,007 |  |  | 239,107 |  |  | 243,114 |
Consumer | 6,935 |  |  | 2,440 |  |  | 2,901 |  |  | 12,276 |  |  | 1,541,749 |  |  | 1,554,025 |
Other | 46 |  |  | 47 |  |  | 129 |  |  | 222 |  |  | 281,263 |  |  | 281,485 |
Total non-PCI loans and leases | $ | 66,931 |  |  | $ | 15,972 |  |  | $ | 44,383 |  |  | $ | 127,286 |  |  | $ | 22,780,854 |  |  | $ | 22,908,140 |
| December 31, 2017
| 30-59 days past due |  | 60-89 days past due |  | 90 days or greater |  | Total past due |  | Current |  | Total loans and leases
Non-PCI loans and leases: |  |  |  |  |  |  |  |  |  |  |
Construction and land development - commercial | $ | 491 |  |  | $ | 442 |  |  | $ | 357 |  |  | $ | 1,290 |  |  | $ | 667,925 |  |  | $ | 669,215 |
Commercial mortgage | 12,288 |  |  | 2,375 |  |  | 6,490 |  |  | 21,153 |  |  | 9,707,869 |  |  | 9,729,022 |
Other commercial real estate | 107 |  |  | — |  |  | 75 |  |  | 182 |  |  | 473,251 |  |  | 473,433 |
Commercial and industrial | 6,694 |  |  | 1,510 |  |  | 1,266 |  |  | 9,470 |  |  | 2,720,937 |  |  | 2,730,407 |
Lease financing | 2,983 |  |  | 167 |  |  | 973 |  |  | 4,123 |  |  | 890,678 |  |  | 894,801 |
Residential mortgage | 27,886 |  |  | 8,064 |  |  | 21,901 |  |  | 57,851 |  |  | 3,465,935 |  |  | 3,523,786 |
Revolving mortgage | 13,428 |  |  | 3,485 |  |  | 10,222 |  |  | 27,135 |  |  | 2,674,390 |  |  | 2,701,525 |
Construction and land development - noncommercial | 7,154 |  |  | 108 |  |  | 1,379 |  |  | 8,641 |  |  | 239,648 |  |  | 248,289 |
Consumer | 8,812 |  |  | 2,893 |  |  | 2,995 |  |  | 14,700 |  |  | 1,546,473 |  |  | 1,561,173 |
Other | 188 |  |  | 6 |  |  | 133 |  |  | 327 |  |  | 301,849 |  |  | 302,176 |
Total non-PCI loans and leases | $ | 80,031 |  |  | $ | 19,050 |  |  | $ | 45,791 |  |  | $ | 144,872 |  |  | $ | 22,688,955 |  |  | $ | 22,833,827 |
Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing | The recorded investment, by class, in loans and leases on nonaccrual status, and loans and leases greater than 90 days past due and still accruing at March 31, 2018 and December 31, 2017 for non-PCI loans and leases, were as follows:
| March 31, 2018 |  | December 31, 2017
(Dollars in thousands) | Nonaccrual loans and leases |  | Loans and leases > 90 days and accruing |  | Nonaccrual loans and leases |  | Loans and leases > 90 days and accruing
Non-PCI loans and leases: |  |  |  |  |  |  |
Construction and land development - commercial | $ | 1,059 |  |  | $ | — |  |  | $ | 1,040 |  |  | $ | — |
Commercial mortgage | 20,505 |  |  | 32 |  |  | 22,625 |  |  | 397 |
Other commercial real estate | 616 |  |  | — |  |  | 916 |  |  | — |
Commercial and industrial | 2,928 |  |  | 721 |  |  | 2,884 |  |  | 428 |
Lease financing | 1,687 |  |  | — |  |  | 1,992 |  |  | — |
Residential mortgage | 37,038 |  |  | — |  |  | 38,942 |  |  | — |
Revolving mortgage | 21,421 |  |  | — |  |  | 19,990 |  |  | — |
Construction and land development - noncommercial | 1,722 |  |  | — |  |  | 1,989 |  |  | — |
Consumer | 2,082 |  |  | 2,277 |  |  | 1,992 |  |  | 2,153 |
Other | 202 |  |  | — |  |  | 164 |  |  | — |
Total non-PCI loans and leases | $ | 89,260 |  |  | $ | 3,030 |  |  | $ | 92,534 |  |  | $ | 2,978 |
Schedule of Contractually Required Payments Including Principal and Interest Expected Cash Flows to be Collected and Fair Values [Table Text Block] |
Changes In Carrying Value Of PCI Loans | The following table provides changes in the carrying value of PCI loans during the three months ended March 31, 2018 and March 31, 2017:
(Dollars in thousands) | 2018 |  | 2017
Balance at January 1 | $ | 762,998 |  |  | $ | 809,169 |
Fair value of acquired loans | — |  |  | 85,149 |
Accretion | 17,973 |  |  | 19,351 |
Payments received and other changes, net | (77,134 | ) |  | (64,853 | )
Balance at March 31 | $ | 703,837 |  |  | $ | 848,816 |
Unpaid principal balance at March 31 | $ | 1,108,379 |  |  | $ | 1,155,034 |
Changes in Carrying Value of Accretable Yield for PCI Loans | The following table documents changes to the amount of accretable yield for the first three months of 2018 and 2017.
(Dollars in thousands) | 2018 |  | 2017
Balance at January 1 | $ | 316,679 |  |  | $ | 335,074 |
Additions from acquisitions | — |  |  | 16,653 |
Accretion | (17,973 | ) |  | (19,351 | )
Reclassifications (to) from nonaccretable difference | (929 | ) |  | 11,277 |
Changes in expected cash flows that do not affect nonaccretable difference | 11,568 |  |  | (2,179 | )
Balance at March 31 | $ | 309,345 |  |  | $ | 341,474 |
Changes In Carrying Value of Accretable Yield for PCI Loans |

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