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Loans and Loans Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Composition of Loans | The following table indicates the composition of the acquired and originated loans as of the dates presented:
| December 31,
(dollars in thousands) | 2017 |  | 2016
Commercial |  |  |
Commercial real estate | $ | 2,685,994 |  |  | $ | 2,498,476 |
Commercial and industrial | 1,433,266 |  |  | 1,401,035 |
Commercial construction | 384,334 |  |  | 455,884 |
Total Commercial Loans | 4,503,594 |  |  | 4,355,395 |
Consumer |  |  |
Residential mortgage | 698,774 |  |  | 701,982 |
Home equity | 487,326 |  |  | 482,284 |
Installment and other consumer | 67,204 |  |  | 65,852 |
Consumer construction | 4,551 |  |  | 5,906 |
Total Consumer Loans | 1,257,855 |  |  | 1,256,024 |
Total Portfolio Loans | 5,761,449 |  |  | 5,611,419 |
Loans held for sale | 4,485 |  |  | 3,793 |
Total Loans | $ | 5,765,934 |  |  | $ | 5,615,212 |
Restructured Loans for Periods Presented and Type of Concession | The following tables present the restructured loans by type of concession for the years ended December 31:
| 2017 |  | 2016
(dollars in thousands) | Number of Loans |  |  | Pre-Modification Outstanding Recorded Investment(1) |  |  | Post-Modification Outstanding Recorded Investment(1) |  |  | Total Difference in Recorded Investment |  |  | Number of Loans |  |  | Pre-Modification Outstanding Recorded Investment(1) |  |  | Post-Modification Outstanding Recorded Investment(1) |  |  | Total Difference in Recorded Investment |
Commercial real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 7 bankruptcy(2) | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | 1 |  |  | $ | 709 |  |  | $ | 646 |  |  | $ | (63 | )
Interest Rate Reduction | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 250 |  |  | 242 |  |  | (8 | )
Maturity date extension | 1 |  |  | 400 |  |  | 398 |  |  | (2 | ) |  | — |  |  | — |  |  | — |  |  | — |
Commercial and industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date extension | 1 |  |  | 274 |  |  | 777 |  |  | 503 |  |  | 4 |  |  | 4,756 |  |  | 3,334 |  |  | (1,422 | )
Maturity date extension and interest rate reduction | 2 |  |  | 1,800 |  |  | 1,805 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |
Principal deferral | 2 |  |  | 113 |  |  | 113 |  |  | — |  |  | 5 |  |  | 985 |  |  | 986 |  |  | 1 |
Commercial construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date extension | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | 1,251 |  |  | 1,151 |  |  | (100 | )
Principal forgiveness | 2 |  |  | 1,996 |  |  | 1,996 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Residential mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 7 bankruptcy(2) | 1 |  |  | 33 |  |  | 31 |  |  | (2 | ) |  | 7 |  |  | 439 |  |  | 413 |  |  | (26 | )
Maturity date extension | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 483 |  |  | 414 |  |  | (69 | )
Maturity date extension and interest rate reduction | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 280 |  |  | 279 |  |  | (1 | )
Principal deferral | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 3,273 |  |  | 3,133 |  |  | (140 | )
Home equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 7 bankruptcy(2) | 21 |  |  | 689 |  |  | 643 |  |  | (46 | ) |  | 19 |  |  | 676 |  |  | 643 |  |  | (33 | )
Maturity date extension | 1 |  |  | 231 |  |  | 231 |  |  | — |  |  | 5 |  |  | 305 |  |  | 298 |  |  | (7 | )
Maturity date extension and interest rate reduction | 1 |  |  | 173 |  |  | 113 |  |  | (60 | ) |  | 2 |  |  | 604 |  |  | 598 |  |  | (6 | )
Principal deferral | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 47 |  |  | 45 |  |  | (2 | )
Installment and other consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 7 bankruptcy(2) | 4 |  |  | 48 |  |  | 35 |  |  | (13 | ) |  | 2 |  |  | 16 |  |  | 10 |  |  | (6 | )
Total by Concession Type |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 7 bankruptcy(2) | 26 |  |  | $ | 770 |  |  | $ | 709 |  |  | $ | (61 | ) |  | 29 |  |  | $ | 1,840 |  |  | $ | 1,712 |  |  | $ | (128 | )
Interest rate reduction | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 250 |  |  | 242 |  |  | (8 | )
Maturity date extension | 3 |  |  | 905 |  |  | 1,406 |  |  | 501 |  |  | 13 |  |  | 6,795 |  |  | 5,197 |  |  | (1,598 | )
Maturity date extension and interest rate reduction | 3 |  |  | 1,973 |  |  | 1,918 |  |  | (55 | ) |  | 3 |  |  | 884 |  |  | 877 |  |  | (7 | )
Principal deferral | 2 |  |  | 113 |  |  | 113 |  |  | — |  |  | 7 |  |  | 4,305 |  |  | 4,164 |  |  | (141 | )
Principal forgiveness | 2 |  |  | 1,996 |  |  | 1,996 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | 36 |  |  | $ | 5,757 |  |  | $ | 6,142 |  |  | $ | 385 |  |  | 53 |  |  | $ | 14,074 |  |  | $ | 12,192 |  |  | $ | (1,882 | )
(1)Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2)Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. The following table summarizes our restructured loans as of the dates presented:
| December 31, 2017 |  | December 31, 2016
(dollars in thousands) | Performing TDRs |  |  | Nonperforming TDRs |  |  | Total TDRs |  |  | Performing TDRs |  |  | Nonperforming TDRs |  |  | Total TDRs |
Commercial real estate | $ | 2,579 |  |  | $ | 967 |  |  | $ | 3,546 |  |  | $ | 2,994 |  |  | $ | 646 |  |  | $ | 3,640 |
Commercial and industrial | 3,946 |  |  | 3,197 |  |  | 7,143 |  |  | 1,387 |  |  | 4,493 |  |  | 5,880 |
Commercial construction | 2,420 |  |  | 2,413 |  |  | 4,833 |  |  | 2,966 |  |  | 430 |  |  | 3,396 |
Residential mortgage | 2,039 |  |  | 3,585 |  |  | 5,624 |  |  | 2,375 |  |  | 5,068 |  |  | 7,443 |
Home equity | 3,885 |  |  | 979 |  |  | 4,864 |  |  | 3,683 |  |  | 954 |  |  | 4,637 |
Installment and other consumer | 32 |  |  | 9 |  |  | 41 |  |  | 18 |  |  | 7 |  |  | 25 |
Total | $ | 14,901 |  |  | $ | 11,150 |  |  | $ | 26,051 |  |  | $ | 13,423 |  |  | $ | 11,598 |  |  | $ | 25,021 |
Schedule of Nonperforming Assets | The following table is a summary of nonperforming assets as of the dates presented:
| December 31,
(dollars in thousands) | 2017 |  | 2016
Nonperforming Assets |  |  |
Nonaccrual loans | $ | 12,788 |  |  | $ | 31,037 |
Nonaccrual TDRs | 11,150 |  |  | 11,598 |
Total nonaccrual loans | 23,938 |  |  | 42,635 |
OREO | 469 |  |  | 679 |
Total Nonperforming Assets | $ | 24,407 |  |  | $ | 43,314 |
Summary of Aggregate Amount of Loans to Officers and Directors | The following table presents a summary of the aggregate amount of loans to certain officers, directors of S&T or any affiliates of such persons as of December 31:
(dollars in thousands) | 2017 |  | 2016
Balance at beginning of year | $ | 25,167 |  |  | $ | 24,517 |
New loans | 25,203 |  |  | 22,740 |
Repayments or no longer considered a related party | (40,300 | ) |  | (22,090 | )
| $ | 10,070 |  |  | $ | 25,167 |

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