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Loans and Allowance for Loan Losses (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Loans, Net of Unearned Income |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | September 30, |  | December 31,
﻿(in thousands) |  | 2018 |  | 2017
﻿Commercial non-real estate |  | $ | 8,438,884 |  | $ | 8,297,937
﻿Commercial real estate - owner occupied |  |  | 2,300,271 |  |  | 2,142,439
﻿ Total commercial and industrial |  |  | 10,739,155 |  |  | 10,440,376
﻿Commercial real estate - income producing |  |  | 2,311,699 |  |  | 2,384,599
﻿Construction and land development |  |  | 1,523,419 |  |  | 1,373,421
﻿Residential mortgages |  |  | 2,846,916 |  |  | 2,690,472
﻿Consumer |  |  | 2,122,528 |  |  | 2,115,295
﻿Total loans |  | $ | 19,543,717 |  | $ | 19,004,163
﻿
Allowance for Loan Losses by Portfolio Class |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  | Commercial |  |  |  |  | Commercial |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Commercial |  | real estate- |  | Total |  | real estate- |  | Construction |  |  |  |  |  |  |  |  |
﻿ |  |  | non-real |  | owner |  | commercial |  | income |  | and land |  | Residential |  |  |  |  |  |
﻿(in thousands) |  | estate |  | occupied |  | and industrial |  | producing |  | development |  | mortgages |  | Consumer |  | Total
﻿ |  | Nine Months Ended September 30, 2018
﻿Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Beginning balance |  | $ | 127,918 |  | $ | 12,962 |  | $ | 140,880 |  | $ | 13,709 |  | $ | 7,372 |  | $ | 24,844 |  | $ | 30,503 |  | $ | 217,308
﻿Charge-offs |  |  | (15,401) |  |  | (7,330) |  |  | (22,731) |  |  | (1,633) |  |  | (265) |  |  | (585) |  |  | (18,599) |  |  | (43,813)
﻿Recoveries |  |  | 13,234 |  |  | 282 |  |  | 13,516 |  |  | 221 |  |  | 68 |  |  | 1,854 |  |  | 4,028 |  |  | 19,687
﻿Net provision for loan losses |  |  | (5,073) |  |  | 7,203 |  |  | 2,130 |  |  | 6,288 |  |  | 6,248 |  |  | (1,803) |  |  | 15,153 |  |  | 28,016
﻿Reduction as a result of sale of subsidiary |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6,648) |  |  | (6,648)
﻿Ending balance |  | $ | 120,678 |  | $ | 13,117 |  | $ | 133,795 |  | $ | 18,585 |  | $ | 13,423 |  | $ | 24,310 |  | $ | 24,437 |  | $ | 214,550
﻿Ending balance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Allowance: |  | September 30, 2018
﻿Individually evaluated for impairment |  | $ | 23,101 |  | $ | 225 |  | $ | 23,326 |  | $ | 285 |  | $ | 1 |  | $ | 163 |  | $ | 131 |  | $ | 23,906
﻿Amounts related to purchased credit impaired loans |  |  | 327 |  |  | 403 |  |  | 730 |  |  | 45 |  |  | 91 |  |  | 10,109 |  |  | 433 |  |  | 11,408
﻿Collectively evaluated for impairment |  |  | 97,250 |  |  | 12,489 |  |  | 109,739 |  |  | 18,255 |  |  | 13,331 |  |  | 14,038 |  |  | 23,873 |  |  | 179,236
﻿Total allowance |  | $ | 120,678 |  | $ | 13,117 |  | $ | 133,795 |  | $ | 18,585 |  | $ | 13,423 |  | $ | 24,310 |  | $ | 24,437 |  | $ | 214,550
﻿Loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Individually evaluated for impairment |  | $ | 275,966 |  | $ | 22,437 |  | $ | 298,403 |  | $ | 4,615 |  | $ | 112 |  | $ | 3,061 |  | $ | 890 |  | $ | 307,081
﻿Purchased credit impaired loans |  |  | 7,907 |  |  | 7,113 |  |  | 15,020 |  |  | 3,790 |  |  | 4,232 |  |  | 107,535 |  |  | 4,458 |  |  | 135,035
﻿Collectively evaluated for impairment |  |  | 8,155,011 |  |  | 2,270,721 |  |  | 10,425,732 |  |  | 2,303,294 |  |  | 1,519,075 |  |  | 2,736,320 |  |  | 2,117,180 |  |  | 19,101,601
﻿Total loans |  | $ | 8,438,884 |  | $ | 2,300,271 |  | $ | 10,739,155 |  | $ | 2,311,699 |  | $ | 1,523,419 |  | $ | 2,846,916 |  | $ | 2,122,528 |  | $ | 19,543,717
﻿ ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  | Commercial |  |  |  |  | Commercial |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Commercial |  | real estate- |  | Total |  | real estate- |  | Construction |  |  |  |  |  |  |  |  |
﻿ |  | non-real |  | owner |  | commercial |  | income |  | and land |  | Residential |  |  |  |  |  |
﻿(in thousands) |  | estate |  | occupied |  | and industrial |  | producing |  | development |  | mortgages |  | Consumer |  | Total
﻿ |  | Nine Months Ended September 30, 2017
﻿Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Beginning balance |  | $ | 147,052 |  | $ | 11,083 |  | $ | 158,135 |  | $ | 13,509 |  | $ | 6,271 |  | $ | 25,361 |  | $ | 26,142 |  | $ | 229,418
﻿Charge-offs |  |  | (35,247) |  |  | (527) |  |  | (35,774) |  |  | (160) |  |  | (670) |  |  | (2,485) |  |  | (22,844) |  |  | (61,933)
﻿Recoveries |  |  | 6,442 |  |  | 447 |  |  | 6,889 |  |  | 655 |  |  | 1,050 |  |  | 339 |  |  | 5,248 |  |  | 14,181
﻿Net provision for loan losses |  |  | 15,895 |  |  | 2,556 |  |  | 18,451 |  |  | 486 |  |  | (70) |  |  | 4,163 |  |  | 20,952 |  |  | 43,982
﻿Decrease in FDIC loss share receivable |  |  | (47) |  |  | — |  |  | (47) |  |  | — |  |  | — |  |  | (2,344) |  |  | (135) |  |  | (2,526)
﻿Ending balance |  | $ | 134,095 |  | $ | 13,559 |  | $ | 147,654 |  | $ | 14,490 |  | $ | 6,581 |  | $ | 25,034 |  | $ | 29,363 |  | $ | 223,122
﻿Ending balance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Individually evaluated for impairment |  | $ | 20,880 |  | $ | 477 |  | $ | 21,357 |  | $ | 1,321 |  | $ | 1 |  | $ | 406 |  | $ | 405 |  | $ | 23,490
﻿Amounts related to purchased credit impaired loans |  |  | 417 |  |  | 784 |  |  | 1,201 |  |  | 199 |  |  | 254 |  |  | 12,795 |  |  | 863 |  |  | 15,312
﻿Collectively evaluated for impairment |  |  | 112,798 |  |  | 12,298 |  |  | 125,096 |  |  | 12,970 |  |  | 6,326 |  |  | 11,833 |  |  | 28,095 |  |  | 184,320
﻿Total allowance |  | $ | 134,095 |  | $ | 13,559 |  | $ | 147,654 |  | $ | 14,490 |  | $ | 6,581 |  | $ | 25,034 |  | $ | 29,363 |  | $ | 223,122
﻿Loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Individually evaluated for impairment |  | $ | 271,024 |  | $ | 6,351 |  | $ | 277,375 |  | $ | 14,295 |  | $ | 480 |  | $ | 8,942 |  | $ | 1,306 |  | $ | 302,398
﻿Purchased credit impaired loans |  |  | 20,186 |  |  | 13,021 |  |  | 33,207 |  |  | 5,353 |  |  | 6,670 |  |  | 123,244 |  |  | 7,637 |  |  | 176,111
﻿Collectively evaluated for impairment |  |  | 7,838,219 |  |  | 2,056,642 |  |  | 9,894,861 |  |  | 2,492,160 |  |  | 1,365,898 |  |  | 2,464,506 |  |  | 2,090,351 |  |  | 18,307,776
﻿ Total loans |  | $ | 8,129,429 |  | $ | 2,076,014 |  | $ | 10,205,443 |  | $ | 2,511,808 |  | $ | 1,373,048 |  | $ | 2,596,692 |  | $ | 2,099,294 |  | $ | 18,786,285
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿
Composition of Nonaccrual Loans by Portfolio Class |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | September 30, |  | December 31,
﻿(in thousands) |  | 2018 |  | 2017
﻿Commercial non-real estate |  | $ | 126,429 |  | $ | 152,863
﻿Commercial real estate - owner occupied |  |  | 20,719 |  |  | 25,989
﻿ Total commercial and industrial |  |  | 147,148 |  |  | 178,852
﻿Commercial real estate - income producing |  |  | 3,941 |  |  | 14,574
﻿Construction and land development |  |  | 3,249 |  |  | 3,807
﻿Residential mortgages |  |  | 31,732 |  |  | 40,480
﻿Consumer |  |  | 15,576 |  |  | 15,087
﻿ Total loans |  | $ | 201,646 |  | $ | 252,800
﻿
Troubled Debt Restructurings Modified by Portfolio Class | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Three Months Ended
﻿($ in thousands) |  | September 30, 2018 |  |  |  | September 30, 2017 |
﻿ |  |  |  |  | Pre-Modification |  | Post-Modification |  |  |  |  |  | Pre-Modification |  | Post-Modification
﻿ |  | Number |  |  | Outstanding |  | Outstanding |  |  | Number |  |  | Outstanding |  | Outstanding |
﻿ |  | of |  |  | Recorded |  | Recorded |  |  | of |  |  | Recorded |  | Recorded
﻿Troubled Debt Restructurings: |  | Contracts |  |  | Investment |  | Investment |  | Contracts |  | Investment |  | Investment
﻿Commercial non-real estate |  | 11 |  |  | $ | 23,347 |  |  | $ | 23,347 |  |  |  | 13 |  |  |  | 42,148 |  |  |  | 42,148 |
﻿Commercial real estate - owner occupied |  | 1 |  |  |  | 229 |  |  |  | 229 |  |  |  | — |  |  |  | — |  |  |  | — |
﻿ Total commercial and industrial |  | 12 |  |  |  | 23,576 |  |  |  | 23,576 |  |  |  | 13 |  |  |  | 42,148 |  |  |  | 42,148 |
﻿Commercial real estate - income producing |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
﻿Construction and land development |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
﻿Residential mortgages |  | 8 |  |  |  | 930 |  |  |  | 930 |  |  |  | 7 |  |  |  | 970 |  |  |  | 970 |
﻿Consumer |  | 6 |  |  |  | 89 |  |  |  | 89 |  |  |  | — |  |  |  | — |  |  |  | — |
﻿Total loans |  | 26 |  |  | $ | 24,595 |  |  | $ | 24,595 |  |  |  | 20 |  |  |  | 43,118 |  |  |  | 43,118 |
﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | Nine Months Ended
﻿($ in thousands) |  | September 30, 2018 |  |  |  | September 30, 2017
﻿ |  |  |  |  | Pre-Modification |  | Post-Modification |  |  |  |  |  | Pre-Modification |  | Post-Modification
﻿ |  | Number |  |  | Outstanding |  | Outstanding |  |  | Number |  |  | Outstanding |  | Outstanding
﻿ |  | of |  |  | Recorded |  | Recorded |  |  | of |  |  | Recorded |  | Recorded
﻿Troubled Debt Restructurings: |  | Contracts |  |  | Investment |  | Investment |  | Contracts |  | Investment |  | Investment
﻿Commercial non-real estate |  | 29 |  |  | $ | 85,306 |  |  | $ | 85,306 |  |  |  | 50 |  |  | $ | 135,926 |  |  | $ | 135,926
﻿Commercial real estate - owner occupied |  | 2 |  |  |  | 6,138 |  |  |  | 6,138 |  |  |  | 4 |  |  |  | 3,734 |  |  |  | 3,734
﻿ Total commercial and industrial |  | 31 |  |  |  | 91,444 |  |  |  | 91,444 |  |  |  | 54 |  |  |  | 139,660 |  |  |  | 139,660
﻿Commercial real estate - income producing |  | 1 |  |  |  | 1,564 |  |  |  | 1,564 |  |  |  | 5 |  |  |  | 5,684 |  |  |  | 5,684
﻿Construction and land development |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | —
﻿Residential mortgages |  | 11 |  |  |  | 1,048 |  |  |  | 1,048 |  |  |  | 13 |  |  |  | 2,068 |  |  |  | 2,068
﻿Consumer |  | 7 |  |  |  | 311 |  |  |  | 311 |  |  |  | 1 |  |  |  | 40 |  |  |  | 42
﻿Total loans |  | 50 |  |  | $ | 94,367 |  |  | $ | 94,367 |  |  |  | 73 |  |  | $ | 147,452 |  |  | $ | 147,454
﻿
Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | September 30, 2018
﻿ |  | Recorded investment |  |  | Recorded investment |  |  | Unpaid |  |  |
﻿(in thousands) |  | without an allowance |  |  | with an allowance |  |  | principal balance |  |  | Related allowance
﻿Commercial non-real estate | $ | 140,504 |  | $ | 135,462 |  | $ | 293,012 |  | $ | 23,101
﻿Commercial real estate - owner occupied |  | 13,259 |  |  | 9,178 |  |  | 26,787 |  |  | 225
﻿ Total commercial and industrial |  | 153,763 |  |  | 144,640 |  |  | 319,799 |  |  | 23,326
﻿Commercial real estate - income producing |  | 2,977 |  |  | 1,638 |  |  | 5,474 |  |  | 285
﻿Construction and land development |  | 100 |  |  | 12 |  |  | 112 |  |  | 1
﻿Residential mortgages |  | 1,482 |  |  | 1,579 |  |  | 3,609 |  |  | 163
﻿Consumer |  | 279 |  |  | 611 |  |  | 1,136 |  |  | 131
﻿Total loans | $ | 158,601 |  | $ | 148,480 |  | $ | 330,130 |  | $ | 23,906
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | December 31, 2017
﻿ |  | Recorded investment |  |  | Recorded investment |  |  | Unpaid |  |  |
﻿(in thousands) |  | without an allowance |  |  | with an allowance |  |  | principal balance |  |  | Related allowance
﻿Commercial non-real estate | $ | 116,682 |  | $ | 151,199 |  | $ | 285,685 |  | $ | 16,129
﻿Commercial real estate - owner occupied |  | 16,927 |  |  | 4,564 |  |  | 24,829 |  |  | 793
﻿ Total commercial and industrial |  | 133,609 |  |  | 155,763 |  |  | 310,514 |  |  | 16,922
﻿Commercial real estate - income producing |  | 5,101 |  |  | 10,429 |  |  | 15,687 |  |  | 1,326
﻿Construction and land development |  | 100 |  |  | 263 |  |  | 363 |  |  | 11
﻿Residential mortgages |  | 8,245 |  |  | 2,395 |  |  | 13,855 |  |  | 189
﻿Consumer |  | — |  |  | 1,292 |  |  | 1,294 |  |  | 118
﻿Total loans | $ | 147,055 |  | $ | 170,142 |  | $ | 341,713 |  | $ | 18,566
﻿ ﻿ The tables below present the average balances and interest income for total impaired loans for the three and nine months ended September 30, 2018 and 2017. Interest income recognized represents interest on accruing loans modified in a TDR. ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended
﻿ |  | September 30, 2018 |  | September 30, 2017
﻿(in thousands) |  | Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
﻿Commercial non-real estate |  | $ | 283,519 |  | $ | 2,275 |  | $ | 260,640 |  | $ | 872
﻿Commercial real estate - owner occupied |  |  | 24,702 |  |  | 90 |  |  | 6,916 |  |  | 24
﻿Total commercial and industrial |  |  | 308,221 |  |  | 2,365 |  |  | 267,556 |  |  | 896
﻿Commercial real estate - income producing |  |  | 6,718 |  |  | 15 |  |  | 14,604 |  |  | 35
﻿Construction and land development |  |  | 113 |  |  | — |  |  | 663 |  |  | 1
﻿Residential mortgages |  |  | 3,397 |  |  | 4 |  |  | 6,204 |  |  | 7
﻿Consumer |  |  | 745 |  |  | 10 |  |  | 1,179 |  |  | 4
﻿Total loans |  | $ | 319,194 |  | $ | 2,394 |  | $ | 290,206 |  | $ | 943
﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Nine Months Ended
﻿ |  | September 30, 2018 |  | September 30, 2017
﻿(in thousands) |  | Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
﻿Commercial non-real estate |  | $ | 295,636 |  | $ | 5,863 |  | $ | 251,129 |  | $ | 1,806
﻿Commercial real estate - owner occupied |  |  | 26,416 |  |  | 258 |  |  | 5,895 |  |  | 46
﻿Total commercial and industrial |  |  | 322,052 |  |  | 6,121 |  |  | 257,024 |  |  | 1,852
﻿Commercial real estate - income producing |  |  | 10,988 |  |  | 64 |  |  | 14,449 |  |  | 112
﻿Construction and land development |  |  | 155 |  |  | — |  |  | 1,216 |  |  | 1
﻿Residential mortgages |  |  | 6,307 |  |  | 14 |  |  | 4,449 |  |  | 12
﻿Consumer |  |  | 769 |  |  | 28 |  |  | 1,644 |  |  | 9
﻿Total loans |  | $ | 340,271 |  | $ | 6,227 |  | $ | 278,782 |  | $ | 1,986
﻿
Age Analysis of Past Due Loans by Portfolio Class | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Recorded
﻿ |  |  |  |  |  | Greater than |  |  |  |  |  |  |  |  | investment
﻿ |  | 30-59 days |  | 60-89 days |  | 90 days |  | Total |  |  |  | Total |  | > 90 days and
﻿September 30, 2018 |  | past due |  | past due |  | past due |  | past due |  | Current |  | Loans |  | still accruing
﻿(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commercial non-real estate |  | $ | 10,752 |  | $ | 26,454 |  | $ | 116,791 |  | $ | 153,997 |  | $ | 8,284,887 |  | $ | 8,438,884 |  | $ | 27,606
﻿Commercial real estate - owner occupied |  |  | 2,001 |  |  | 459 |  |  | 16,377 |  |  | 18,837 |  |  | 2,281,434 |  |  | 2,300,271 |  |  | 641
﻿ Total commercial and industrial |  |  | 12,753 |  |  | 26,913 |  |  | 133,168 |  |  | 172,834 |  |  | 10,566,321 |  |  | 10,739,155 |  |  | 28,247
﻿Commercial real estate - income producing |  |  | 1,541 |  |  | 198 |  |  | 6,371 |  |  | 8,110 |  |  | 2,303,589 |  |  | 2,311,699 |  |  | 1,830
﻿Construction and land development |  |  | 11,976 |  |  | 1,532 |  |  | 2,044 |  |  | 15,552 |  |  | 1,507,867 |  |  | 1,523,419 |  |  | 78
﻿Residential mortgages |  |  | 36,632 |  |  | 11,976 |  |  | 18,006 |  |  | 66,614 |  |  | 2,780,302 |  |  | 2,846,916 |  |  | —
﻿Consumer |  |  | 14,582 |  |  | 4,919 |  |  | 9,162 |  |  | 28,663 |  |  | 2,093,865 |  |  | 2,122,528 |  |  | 371
﻿Total |  | $ | 77,484 |  | $ | 45,538 |  | $ | 168,751 |  | $ | 291,773 |  | $ | 19,251,944 |  | $ | 19,543,717 |  | $ | 30,526
﻿ ﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Recorded
﻿ |  |  |  |  |  |  | Greater than |  |  |  |  |  |  |  |  | investment
﻿ |  | 30-59 days |  | 60-89 days |  | 90 days |  | Total |  |  |  | Total |  | > 90 days and
﻿December 31, 2017 |  | past due |  | past due |  | past due |  | past due |  | Current |  | Loans |  | still accruing
﻿(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commercial non-real estate |  | $ | 62,766 |  | $ | 10,761 |  | $ | 92,982 |  | $ | 166,509 |  | $ | 8,131,428 |  | $ | 8,297,937 |  | $ | 21,989
﻿Commercial real estate - owner occupied |  |  | 8,493 |  |  | 648 |  |  | 15,517 |  |  | 24,658 |  |  | 2,117,781 |  |  | 2,142,439 |  |  | 2,032
﻿ Total commercial and industrial |  |  | 71,259 |  |  | 11,409 |  |  | 108,499 |  |  | 191,167 |  |  | 10,249,209 |  |  | 10,440,376 |  |  | 24,021
﻿Commercial real estate - income producing |  |  | 5,315 |  |  | 2,165 |  |  | 6,081 |  |  | 13,561 |  |  | 2,371,038 |  |  | 2,384,599 |  |  | 489
﻿Construction and land development |  |  | 4,113 |  |  | 1,056 |  |  | 3,412 |  |  | 8,581 |  |  | 1,364,840 |  |  | 1,373,421 |  |  | 477
﻿Residential mortgages |  |  | 33,621 |  |  | 10,554 |  |  | 30,537 |  |  | 74,712 |  |  | 2,615,760 |  |  | 2,690,472 |  |  | 2,208
﻿Consumer |  |  | 22,959 |  |  | 7,816 |  |  | 8,553 |  |  | 39,328 |  |  | 2,075,967 |  |  | 2,115,295 |  |  | 571
﻿Total |  | $ | 137,267 |  | $ | 33,000 |  | $ | 157,082 |  | $ | 327,349 |  | $ | 18,676,814 |  | $ | 19,004,163 |  | $ | 27,766
﻿
Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | September 30, 2018 |  | December 31, 2017
﻿ |  | Carrying |  |  |  |  | Carrying |  |  |
﻿ |  | Amount |  | Accretable |  |  | Amount |  | Accretable |
﻿(in thousands) |  | of Loans |  | Yield |  |  | of Loans |  | Yield |
﻿Balance at beginning of period |  | $ | 153,403 |  | $ | 62,517 |  |  | $ | 190,915 |  | $ | 113,686 |
﻿Addition of cost recovery loans - FNBC I |  |  | — |  |  | — |  |  |  | 15,000 |  |  | — |
﻿Payments received, net |  |  | (30,448) |  |  | (4,564) |  |  |  | (69,591) |  |  | (7,412) |
﻿Accretion |  |  | 12,080 |  |  | (12,080) |  |  |  | 17,079 |  |  | (17,079) |
﻿Decrease in expected cash flows based on actual cash flows and changes in cash flow assumptions |  |  | — |  |  | (2,801) |  |  |  | — |  |  | (30,379) |
﻿Net transfers from nonaccretable difference to accretable yield |  |  | — |  |  | — |  |  |  | — |  |  | 3,701 |
﻿Balance at end of period |  | $ | 135,035 |  | $ | 43,072 |  |  | $ | 153,403 |  | $ | 62,517 |
﻿
Total Commercial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Credit Quality Indicators by Segments and Portfolio Class |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | September 30, 2018
﻿(in thousands) |  | Commercial non-real estate |  | Commercial real estate - owner-occupied |  | Total commercial and industrial |  | Commercial real estate - income producing |  | Construction and land development |  | Total commercial |
﻿Grade: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Pass |  | $ | 7,593,629 |  | $ | 2,106,568 |  | $ | 9,700,197 |  | $ | 2,211,829 |  | $ | 1,473,080 |  | $ | 13,385,106 |
﻿Pass-Watch |  |  | 201,226 |  |  | 70,831 |  |  | 272,057 |  |  | 46,155 |  |  | 37,100 |  |  | 355,312 |
﻿Special Mention |  |  | 89,825 |  |  | 34,133 |  |  | 123,958 |  |  | 26,086 |  |  | 952 |  |  | 150,996 |
﻿Substandard |  |  | 554,184 |  |  | 88,739 |  |  | 642,923 |  |  | 27,629 |  |  | 12,287 |  |  | 682,839 |
﻿Doubtful |  |  | 20 |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
﻿Total |  | $ | 8,438,884 |  | $ | 2,300,271 |  | $ | 10,739,155 |  | $ | 2,311,699 |  | $ | 1,523,419 |  | $ | 14,574,273 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017
﻿(in thousands) |  | Commercial non-real estate |  | Commercial real estate - owner-occupied |  | Total commercial and industrial |  | Commercial real estate - income producing |  | Construction and land development |  | Total commercial |
﻿Grade: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Pass |  | $ | 7,190,604 |  | $ | 1,896,366 |  | $ | 9,086,970 |  | $ | 2,223,245 |  | $ | 1,291,638 |  | $ | 12,601,853 |
﻿Pass-Watch |  |  | 293,069 |  |  | 82,913 |  |  | 375,982 |  |  | 83,444 |  |  | 60,804 |  |  | 520,230 |
﻿Special Mention |  |  | 80,649 |  |  | 27,456 |  |  | 108,105 |  |  | 13,244 |  |  | 4,788 |  |  | 126,137 |
﻿Substandard |  |  | 733,558 |  |  | 135,704 |  |  | 869,262 |  |  | 64,658 |  |  | 16,191 |  |  | 950,111 |
﻿Doubtful |  |  | 57 |  |  | — |  |  | 57 |  |  | 8 |  |  | — |  |  | 65 |
﻿Total |  | $ | 8,297,937 |  | $ | 2,142,439 |  | $ | 10,440,376 |  | $ | 2,384,599 |  | $ | 1,373,421 |  | $ | 14,198,396 |
﻿
Residential Mortgage and Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Credit Quality Indicators by Segments and Portfolio Class |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | September 30, 2018 |  | December 31, 2017
﻿(in thousands) |  | Residential mortgage |  | Consumer |  | Total |  | Residential mortgage |  | Consumer |  | Total |
﻿Performing |  | $ | 2,815,184 |  | $ | 2,106,581 |  | $ | 4,921,765 |  | $ | 2,647,784 |  | $ | 2,099,637 |  | $ | 4,747,421 |
﻿Nonperforming |  |  | 31,732 |  |  | 15,947 |  |  | 47,679 |  |  | 42,688 |  |  | 15,658 |  |  | 58,346 |
﻿Total |  | $ | 2,846,916 |  | $ | 2,122,528 |  | $ | 4,969,444 |  | $ | 2,690,472 |  | $ | 2,115,295 |  | $ | 4,805,767 |
﻿

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