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Loans, Allowance for Loan Losses and Credit Quality (Tables) | 9 Months Ended
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Sep. 30, 2017
Loans, Allowance for Loan Losses and Credit Quality [Abstract] |
Tabular disclosure of financing receivables bifurcated by type of impairment evaluation [Table Text Block] | The following tables bifurcate the amount of loans and the allowance allocated to each loan category based on the type of impairment analysis as of the periods indicated:
| September 30, 2017 |
| (Dollars in thousands) |
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total |
Financing receivables ending balance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment | $ | 823,007 |  |  | $ | 3,060,211 |  |  | $ | 395,267 |  |  | $ | 129,676 |  |  | $ | 735,454 |  |  | $ | 1,045,445 |  |  | $ | 9,550 |  |  | $ | 6,198,610 |  |
Individually evaluated for impairment | $ | 35,515 |  |  | $ | 19,018 |  |  | $ | — |  |  | $ | 980 |  |  | $ | 13,649 |  |  | $ | 6,636 |  |  | $ | 322 |  |  | $ | 76,120 |  |
Purchased credit impaired loans | $ | — |  |  | $ | 7,931 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,027 |  |  | $ | 214 |  |  | $ | — |  |  | $ | 15,172 |  |
Total loans by group | $ | 858,522 |  |  | $ | 3,087,160 |  |  | $ | 395,267 |  |  | $ | 130,656 |  |  | $ | 756,130 |  |  | $ | 1,052,295 |  |  | $ | 9,872 |  |  | $ | 6,289,902 |  | (1 | )
| December 31, 2016 |
| (Dollars in thousands) |
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total |
Financing receivables ending balance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment | $ | 862,875 |  |  | $ | 2,983,642 |  |  | $ | 320,391 |  |  | $ | 121,855 |  |  | $ | 622,392 |  |  | $ | 982,095 |  |  | $ | 10,666 |  |  | $ | 5,903,916 |  |
Individually evaluated for impairment | $ | 39,178 |  |  | $ | 16,813 |  |  | $ | — |  |  | $ | 871 |  |  | $ | 14,175 |  |  | $ | 5,863 |  |  | $ | 397 |  |  | $ | 77,297 |  |
Purchased credit impaired loans | $ | — |  |  | $ | 10,343 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,859 |  |  | $ | 189 |  |  | $ | 1 |  |  | $ | 18,392 |  |
Total loans by group | $ | 902,053 |  |  | $ | 3,010,798 |  |  | $ | 320,391 |  |  | $ | 122,726 |  |  | $ | 644,426 |  |  | $ | 988,147 |  |  | $ | 11,064 |  |  | $ | 5,999,605 |  | (1 | )
(1) | The amount of net deferred costs on originated loans included in the ending balance was $5.6 million and $5.1 million at September 30, 2017 and December 31, 2016, respectively. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $9.8 million and $8.6 million at September 30, 2017 and December 31, 2016, respectively.
Summary of changes in allowance for loan losses | The following tables summarize changes in allowance for loan losses by loan category for the periods indicated:
| Three Months Ended September 30, 2017
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 13,544 |  |  | $ | 30,947 |  |  | $ | 4,814 |  |  | $ | 1,613 |  |  | $ | 2,693 |  |  | $ | 5,353 |  |  | $ | 515 |  |  | $ | 59,479 |
Charge-offs | (124 | ) |  | — |  |  | — |  |  | (164 | ) |  | (43 | ) |  | (81 | ) |  | (405 | ) |  | (817 | )
Recoveries | 404 |  |  | 286 |  |  | — |  |  | 17 |  |  | 15 |  |  | 65 |  |  | 261 |  |  | 1,048 |
Provision (benefit) | (994 | ) |  | (233 | ) |  | 806 |  |  | 140 |  |  | 111 |  |  | 89 |  |  | 81 |  |  | — |
Ending balance | $ | 12,830 |  |  | $ | 31,000 |  |  | $ | 5,620 |  |  | $ | 1,606 |  |  | $ | 2,776 |  |  | $ | 5,426 |  |  | $ | 452 |  |  | $ | 59,710 |
| Three Months Ended September 30, 2016
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 14,027 |  |  | $ | 29,011 |  |  | $ | 5,216 |  |  | $ | 1,441 |  |  | $ | 2,578 |  |  | $ | 4,986 |  |  | $ | 468 |  |  | $ | 57,727 |
Charge-offs | (27 | ) |  | (341 | ) |  | — |  |  | (98 | ) |  | — |  |  | (154 | ) |  | (523 | ) |  | (1,143 | )
Recoveries | 63 |  |  | 124 |  |  | — |  |  | 28 |  |  | 130 |  |  | 24 |  |  | 302 |  |  | 671 |
Provision (benefit) | (189 | ) |  | 609 |  |  | 117 |  |  | 113 |  |  | (44 | ) |  | 196 |  |  | 148 |  |  | 950 |
Ending balance | $ | 13,874 |  |  | $ | 29,403 |  |  | $ | 5,333 |  |  | $ | 1,484 |  |  | $ | 2,664 |  |  | $ | 5,052 |  |  | $ | 395 |  |  | $ | 58,205 |
| Nine Months Ended September 30, 2017
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 16,921 |  |  | $ | 30,369 |  |  | $ | 4,522 |  |  | $ | 1,502 |  |  | $ | 2,621 |  |  | $ | 5,238 |  |  | $ | 393 |  |  | $ | 61,566 |
Charge-offs | (3,715 | ) |  | — |  |  | — |  |  | (258 | ) |  | (182 | ) |  | (217 | ) |  | (1,151 | ) |  | (5,523 | )
Recoveries | 604 |  |  | 343 |  |  | — |  |  | 96 |  |  | 29 |  |  | 167 |  |  | 778 |  |  | 2,017 |
Provision (benefit) | (980 | ) |  | 288 |  |  | 1,098 |  |  | 266 |  |  | 308 |  |  | 238 |  |  | 432 |  |  | 1,650 |
Ending balance | $ | 12,830 |  |  | $ | 31,000 |  |  | $ | 5,620 |  |  | $ | 1,606 |  |  | $ | 2,776 |  |  | $ | 5,426 |  |  | $ | 452 |  |  | $ | 59,710 |
Ending balance: individually evaluated for impairment | $ | 71 |  |  | $ | 49 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1,020 |  |  | $ | 257 |  |  | $ | 19 |  |  | $ | 1,417 |
Ending balance: collectively evaluated for impairment | $ | 12,759 |  |  | $ | 30,951 |  |  | $ | 5,620 |  |  | $ | 1,605 |  |  | $ | 1,756 |  |  | $ | 5,169 |  |  | $ | 433 |  |  | $ | 58,293 |
| Nine Months Ended September 30, 2016
| (Dollars in thousands)
| Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Residential Real Estate |  | Home Equity |  | Other Consumer |  | Total
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ | 13,802 |  |  | $ | 27,327 |  |  | $ | 5,366 |  |  | $ | 1,264 |  |  | $ | 2,590 |  |  | $ | 4,889 |  |  | $ | 587 |  |  | $ | 55,825 |
Charge-offs | (31 | ) |  | (365 | ) |  | — |  |  | (191 | ) |  | (27 | ) |  | (491 | ) |  | (1,152 | ) |  | (2,257 | )
Recoveries | 850 |  |  | 535 |  |  | — |  |  | 122 |  |  | 182 |  |  | 77 |  |  | 796 |  |  | 2,562 |
Provision (benefit) | (747 | ) |  | 1,906 |  |  | (33 | ) |  | 289 |  |  | (81 | ) |  | 577 |  |  | 164 |  |  | 2,075 |
Ending balance | $ | 13,874 |  |  | $ | 29,403 |  |  | $ | 5,333 |  |  | $ | 1,484 |  |  | $ | 2,664 |  |  | $ | 5,052 |  |  | $ | 395 |  |  | $ | 58,205 |
Ending balance: individually evaluated for impairment | $ | 134 |  |  | $ | 355 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1,156 |  |  | $ | 223 |  |  | $ | 23 |  |  | $ | 1,893 |
Ending balance: collectively evaluated for impairment | $ | 13,740 |  |  | $ | 29,048 |  |  | $ | 5,333 |  |  | $ | 1,482 |  |  | $ | 1,508 |  |  | $ | 4,829 |  |  | $ | 372 |  |  | $ | 56,312 |
Internal risk-rating categories for the Company's commercial portfolio | The following table details the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio:
|  |  | September 30, 2017
Category | Risk Rating |  | Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Total
|  |  | (Dollars in thousands)
Pass | 1 - 6 |  | $ | 764,946 |  |  | $ | 2,968,237 |  |  | $ | 393,836 |  |  | $ | 128,464 |  |  | $ | 4,255,483 |
Potential weakness | 7 |  | 23,477 |  |  | 73,219 |  |  | — |  |  | 1,543 |  |  | 98,239 |
Definite weakness-loss unlikely | 8 |  | 63,856 |  |  | 45,240 |  |  | 1,431 |  |  | 646 |  |  | 111,173 |
Partial loss probable | 9 |  | 6,243 |  |  | 464 |  |  | — |  |  | 3 |  |  | 6,710 |
Definite loss | 10 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total |  |  | $ | 858,522 |  |  | $ | 3,087,160 |  |  | $ | 395,267 |  |  | $ | 130,656 |  |  | $ | 4,471,605 |
|  |  | December 31, 2016
Category | Risk Rating |  | Commercial and Industrial |  | Commercial Real Estate |  | Commercial Construction |  | Small Business |  | Total
|  |  | (Dollars in thousands)
Pass | 1 - 6 |  | $ | 783,825 |  |  | $ | 2,876,570 |  |  | $ | 317,099 |  |  | $ | 120,304 |  |  | $ | 4,097,798 |
Potential weakness | 7 |  | 46,176 |  |  | 84,641 |  |  | 1,363 |  |  | 1,859 |  |  | 134,039 |
Definite weakness-loss unlikely | 8 |  | 71,991 |  |  | 47,164 |  |  | 1,929 |  |  | 556 |  |  | 121,640 |
Partial loss probable | 9 |  | 61 |  |  | 2,423 |  |  | — |  |  | 7 |  |  | 2,491 |
Definite loss | 10 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total |  |  | $ | 902,053 |  |  | $ | 3,010,798 |  |  | $ | 320,391 |  |  | $ | 122,726 |  |  | $ | 4,355,968 |
Weighted average FICO scores and the weighted average combined LTV ratio | The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below:
| September 30, 2017 |  | December 31, 2016
Residential portfolio |  |  |
FICO score (re-scored)(1) | 745 |  |  | 743 |
LTV (re-valued)(2) | 61.0 | % |  | 63.2 | %
Home equity portfolio |  |  |
FICO score (re-scored)(1) | 766 |  |  | 767 |
LTV (re-valued)(2) | 55.9 | % |  | 55.9 | %
(1) | The average FICO scores for September 30, 2017 are based upon rescores available from August 31, 2017 and origination score data for loans booked between September 1, 2017 and September 30, 2017. The average FICO scores for December 31, 2016 are based upon rescores available from November 30, 2016 and origination score data for loans booked between December 1, 2016 and December 31, 2016.
(2) | The combined LTV ratios for September 30, 2017 and December 31, 2016 are based upon updated automated valuations as of March 31, 2015 and origination value data for loans booked between April 1, 2015 and through the dates indicated. For home equity loans and lines in a subordinate lien position, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.
Summary of nonaccrual loans | The following table shows information regarding nonaccrual loans at the dates indicated:
| September 30, 2017 |  | December 31, 2016
| (Dollars in thousands)
Commercial and industrial | $ | 32,556 |  |  | $ | 37,455 |
Commercial real estate | 3,052 |  |  | 6,266 |
Small business | 403 |  |  | 302 |
Residential real estate | 8,297 |  |  | 7,782 |
Home equity | 5,903 |  |  | 5,553 |
Other consumer | 59 |  |  | 47 |
Total nonaccrual loans (1) | $ | 50,270 |  |  | $ | 57,405 |
(1) | Included in these amounts were $5.8 million and $5.2 million of nonaccruing TDRs at September 30, 2017 and December 31, 2016, respectively.
Foreclosed Residential Real Estate Property [Table Text Block] | The following table shows information regarding foreclosed residential real estate property at the dates indicated:
| September 30, 2017 |  | December 31, 2016
| (Dollars in thousands)
Foreclosed residential real estate property held by the creditor | $ | 2,538 |  |  | $ | 3,775 |
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure | $ | 1,608 |  |  | $ | 1,715 |
Age analysis of past due financing receivables | The following table shows the age analysis of past due financing receivables as of the dates indicated:
| September 30, 2017
| 30-59 days |  | 60-89 days |  | 90 days or more |  | Total Past Due |  |  |  | Total Financing Receivables |  | Recorded Investment >90 Days and Accruing
| Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Current |
| (Dollars in thousands)
Loan Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | 12 |  |  | $ | 839 |  |  | 2 |  |  | $ | 315 |  |  | 45 |  |  | $ | 32,490 |  |  | 59 |  |  | $ | 33,644 |  |  | $ | 824,878 |  |  | $ | 858,522 |  |  | $ | — |
Commercial real estate | 10 |  |  | 4,413 |  |  | — |  |  | — |  |  | 8 |  |  | 1,755 |  |  | 18 |  |  | 6,168 |  |  | 3,080,992 |  |  | 3,087,160 |  |  | — |
Commercial construction | 1 |  |  | 566 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 566 |  |  | 394,701 |  |  | 395,267 |  |  | — |
Small business | 11 |  |  | 130 |  |  | 5 |  |  | 14 |  |  | 17 |  |  | 107 |  |  | 33 |  |  | 251 |  |  | 130,405 |  |  | 130,656 |  |  | — |
Residential real estate | 12 |  |  | 1,125 |  |  | 10 |  |  | 2,392 |  |  | 20 |  |  | 2,843 |  |  | 42 |  |  | 6,360 |  |  | 749,770 |  |  | 756,130 |  |  | — |
Home equity | 20 |  |  | 1,016 |  |  | 9 |  |  | 516 |  |  | 20 |  |  | 2,559 |  |  | 49 |  |  | 4,091 |  |  | 1,048,204 |  |  | 1,052,295 |  |  | — |
Other consumer (1) | 229 |  |  | 226 |  |  | 10 |  |  | 38 |  |  | 12 |  |  | 14 |  |  | 251 |  |  | 278 |  |  | 9,594 |  |  | 9,872 |  |  | 7 |
Total | 295 |  |  | $ | 8,315 |  |  | 36 |  |  | $ | 3,275 |  |  | 122 |  |  | $ | 39,768 |  |  | 453 |  |  | $ | 51,358 |  |  | $ | 6,238,544 |  |  | $ | 6,289,902 |  |  | $ | 7 |
| December 31, 2016
| 30-59 days |  | 60-89 days |  | 90 days or more |  | Total Past Due |  |  |  | Total Financing Receivables |  | Recorded Investment >90 Days and Accruing
| Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Number of Loans |  | Principal Balance |  | Current |
| (Dollars in thousands)
Loan Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | 8 |  |  | $ | 100 |  |  | 32 |  |  | $ | 253 |  |  | 6 |  |  | $ | 2,480 |  |  | 46 |  |  | $ | 2,833 |  |  | $ | 899,220 |  |  | $ | 902,053 |  |  | $ | — |
Commercial real estate | 5 |  |  | 1,518 |  |  | 8 |  |  | 1,957 |  |  | 8 |  |  | 3,105 |  |  | 21 |  |  | 6,580 |  |  | 3,004,218 |  |  | 3,010,798 |  |  | — |
Commercial construction | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 320,391 |  |  | 320,391 |  |  | — |
Small business | 9 |  |  | 323 |  |  | — |  |  | — |  |  | 19 |  |  | 140 |  |  | 28 |  |  | 463 |  |  | 122,263 |  |  | 122,726 |  |  | — |
Residential real estate | 11 |  |  | 1,277 |  |  | 9 |  |  | 1,950 |  |  | 27 |  |  | 3,507 |  |  | 47 |  |  | 6,734 |  |  | 637,692 |  |  | 644,426 |  |  | — |
Home equity | 19 |  |  | 1,117 |  |  | 11 |  |  | 767 |  |  | 16 |  |  | 1,209 |  |  | 46 |  |  | 3,093 |  |  | 985,054 |  |  | 988,147 |  |  | — |
Other consumer (1) | 249 |  |  | 184 |  |  | 12 |  |  | 17 |  |  | 15 |  |  | 7 |  |  | 276 |  |  | 208 |  |  | 10,856 |  |  | 11,064 |  |  | 2 |
Total | 301 |  |  | $ | 4,519 |  |  | 72 |  |  | $ | 4,944 |  |  | 91 |  |  | $ | 10,448 |  |  | 464 |  |  | $ | 19,911 |  |  | $ | 5,979,694 |  |  | $ | 5,999,605 |  |  | $ | 2 |
(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.
Summary of Troubled Debt Restructuring and other pertinent information | The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated:
| September 30, 2017 |  | December 31, 2016
| (Dollars in thousands)
TDRs on accrual status | $ | 26,731 |  |  | $ | 27,093 |
TDRs on nonaccrual | 5,776 |  |  | 5,199 |
Total TDRs | $ | 32,507 |  |  | $ | 32,292 |
Amount of specific reserves included in the allowance for loan losses associated with TDRs | $ | 1,417 |  |  | $ | 1,417 |
Additional commitments to lend to a borrower who has been a party to a TDR | $ | 1,084 |  |  | $ | 1,378 |
Change in investment recorded subsequent to modifications | The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring:
| Three Months Ended |  | Nine Months Ended
| September 30, 2017 |  | September 30, 2017
| Number of Contracts |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment (1) |  | Number of Contracts |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment (1)
| (Dollars in thousands)
Troubled debt restructurings |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | 1 |  |  | $ | 196 |  |  | $ | 196 |  |  | 9 |  |  | $ | 1,575 |  |  | $ | 1,575 |
Commercial real estate | — |  |  | — |  |  | — |  |  | 6 |  |  | 1,884 |  |  | 1,884 |
Small business | 2 |  |  | 183 |  |  | 183 |  |  | 10 |  |  | 447 |  |  | 447 |
Residential real estate | — |  |  | — |  |  | — |  |  | 5 |  |  | 889 |  |  | 900 |
Home equity | 4 |  |  | 436 |  |  | 436 |  |  | 14 |  |  | 1,427 |  |  | 1,430 |
Total | 7 |  |  | $ | 815 |  |  | $ | 815 |  |  | 44 |  |  | $ | 6,222 |  |  | $ | 6,236 |
| Three Months Ended |  | Nine Months Ended
| September 30, 2016 |  | September 30, 2016
| Number of Contracts |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment (1) |  | Number of Contracts |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment (1)
| (Dollars in thousands)
Troubled debt restructurings |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | — |  |  | $ | — |  |  | $ | — |  |  | 7 |  |  | $ | 528 |  |  | $ | 528 |
Commercial real estate | 3 |  |  | 986 |  |  | 986 |  |  | 9 |  |  | 2,329 |  |  | 2,329 |
Small business | 1 |  |  | 59 |  |  | 59 |  |  | 3 |  |  | 168 |  |  | 168 |
Residential real estate | — |  |  | — |  |  | — |  |  | 5 |  |  | 1,167 |  |  | 1,209 |
Home equity | 4 |  |  | 328 |  |  | 328 |  |  | 8 |  |  | 632 |  |  | 632 |
Other consumer | — |  |  | — |  |  | — |  |  | 5 |  |  | 107 |  |  | 107 |
Total | 8 |  |  | $ | 1,373 |  |  | $ | 1,373 |  |  | 37 |  |  | $ | 4,931 |  |  | $ | 4,973 |
(1) | The post-modification balances represent the legal principal balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.
Post modification balance of Troubled Debt Restructuring | The following table shows the Company’s post-modification balance of TDRs listed by type of modification during the periods indicated:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (Dollars in thousands) |  | (Dollars in thousands)
Extended maturity | $ | 486 |  |  | $ | 256 |  |  | $ | 4,565 |  |  | $ | 2,638 |
Adjusted interest rate | — |  |  | — |  |  | — |  |  | 92 |
Combination rate and maturity | 196 |  |  | 730 |  |  | 196 |  |  | 990 |
Court ordered concession | 133 |  |  | 387 |  |  | 1,475 |  |  | 1,253 |
Total | $ | 815 |  |  | $ | 1,373 |  |  | $ | 6,236 |  |  | $ | 4,973 |
Impaired loans by loan portfolio | The tables below set forth information regarding the Company’s impaired loans by loan portfolio at the dates indicated:
| September 30, 2017
| Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance
| (Dollars in thousands)
With no related allowance recorded |  |  |  |  |
Commercial and industrial | $ | 33,824 |  |  | $ | 38,181 |  |  | $ | — |
Commercial real estate | 14,462 |  |  | 15,476 |  |  | — |
Small business | 678 |  |  | 762 |  |  | — |
Residential real estate | 3,908 |  |  | 4,066 |  |  | — |
Home equity | 4,880 |  |  | 4,984 |  |  | — |
Other consumer | 97 |  |  | 97 |  |  | — |
Subtotal | 57,849 |  |  | 63,566 |  |  | — |
With an allowance recorded |  |  |  |  |
Commercial and industrial | $ | 1,691 |  |  | $ | 1,691 |  |  | $ | 71 |
Commercial real estate | 4,556 |  |  | 4,670 |  |  | 49 |
Small business | 302 |  |  | 315 |  |  | 1 |
Residential real estate | 9,741 |  |  | 10,421 |  |  | 1,020 |
Home equity | 1,756 |  |  | 1,977 |  |  | 257 |
Other consumer | 225 |  |  | 227 |  |  | 19 |
Subtotal | 18,271 |  |  | 19,301 |  |  | 1,417 |
Total | $ | 76,120 |  |  | $ | 82,867 |  |  | $ | 1,417 |
| December 31, 2016
| Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance
| (Dollars in thousands)
With no related allowance recorded |  |  |  |  |
Commercial and industrial | $ | 28,776 |  |  | $ | 29,772 |  |  | $ | — |
Commercial real estate | 11,628 |  |  | 12,891 |  |  | — |
Small business | 494 |  |  | 569 |  |  | — |
Residential real estate | 4,216 |  |  | 4,427 |  |  | — |
Home equity | 4,485 |  |  | 4,572 |  |  | — |
Other consumer | 146 |  |  | 146 |  |  | — |
Subtotal | 49,745 |  |  | 52,377 |  |  | — |
With an allowance recorded |  |  |  |  |
Commercial and industrial | $ | 10,402 |  |  | $ | 10,440 |  |  | $ | 3,661 |
Commercial real estate | 5,185 |  |  | 5,533 |  |  | 196 |
Small business | 377 |  |  | 392 |  |  | 8 |
Residential real estate | 9,959 |  |  | 10,530 |  |  | 1,086 |
Home equity | 1,378 |  |  | 1,547 |  |  | 242 |
Other consumer | 251 |  |  | 252 |  |  | 21 |
Subtotal | 27,552 |  |  | 28,694 |  |  | 5,214 |
Total | $ | 77,297 |  |  | $ | 81,071 |  |  | $ | 5,214 |
Interest income recognized on impaired loans | The following tables set forth information regarding interest income recognized on impaired loans, by portfolio, for the periods indicated:
| Three Months Ended |  | Nine Months Ended
| September 30, 2017 |  | September 30, 2017
| Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
| (Dollars in thousands)
With no related allowance recorded |  |  |  |  |  |  |
Commercial and industrial | $ | 33,935 |  |  | $ | 18 |  |  | $ | 36,329 |  |  | $ | 179 |
Commercial real estate | 14,569 |  |  | 151 |  |  | 14,798 |  |  | 460 |
Small business | 682 |  |  | 5 |  |  | 702 |  |  | 17 |
Residential real estate | 3,928 |  |  | 51 |  |  | 3,962 |  |  | 152 |
Home equity | 4,883 |  |  | 50 |  |  | 4,935 |  |  | 146 |
Other consumer | 99 |  |  | 2 |  |  | 104 |  |  | 5 |
Subtotal | 58,096 |  |  | 277 |  |  | 60,830 |  |  | 959 |
With an allowance recorded |  |  |  |  |  |  |
Commercial and industrial | $ | 1,698 |  |  | $ | 21 |  |  | $ | 1,768 |  |  | $ | 65 |
Commercial real estate | 4,569 |  |  | 65 |  |  | 4,599 |  |  | 195 |
Small business | 305 |  |  | 3 |  |  | 315 |  |  | 11 |
Residential real estate | 9,752 |  |  | 79 |  |  | 9,838 |  |  | 234 |
Home equity | 1,765 |  |  | 14 |  |  | 1,782 |  |  | 41 |
Other consumer | 229 |  |  | 2 |  |  | 237 |  |  | 5 |
Subtotal | 18,318 |  |  | 184 |  |  | 18,539 |  |  | 551 |
Total | $ | 76,414 |  |  | $ | 461 |  |  | $ | 79,369 |  |  | $ | 1,510 |
| Three Months Ended |  | Nine Months Ended
| September 30, 2016 |  | September 30, 2016
| Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
| (Dollars in thousands)
With no related allowance recorded |  |  |  |  |  |  |
Commercial and industrial | $ | 2,444 |  |  | $ | 16 |  |  | $ | 2,584 |  |  | $ | 48 |
Commercial real estate | 11,549 |  |  | 115 |  |  | 11,775 |  |  | 348 |
Small business | 646 |  |  | 5 |  |  | 679 |  |  | 18 |
Residential real estate | 4,255 |  |  | 42 |  |  | 4,286 |  |  | 134 |
Home equity | 4,616 |  |  | 45 |  |  | 4,677 |  |  | 138 |
Other consumer | 162 |  |  | 3 |  |  | 168 |  |  | 9 |
Subtotal | 23,672 |  |  | 226 |  |  | 24,169 |  |  | 695 |
With an allowance recorded |  |  |  |  |  |  |
Commercial and industrial | $ | 2,097 |  |  | $ | 4 |  |  | $ | 2,135 |  |  | $ | 13 |
Commercial real estate | 6,854 |  |  | 42 |  |  | 6,977 |  |  | 126 |
Small business | 367 |  |  | 6 |  |  | 384 |  |  | 17 |
Residential real estate | 10,004 |  |  | 92 |  |  | 10,071 |  |  | 272 |
Home equity | 1,299 |  |  | 13 |  |  | 1,310 |  |  | 36 |
Other consumer | 265 |  |  | 2 |  |  | 272 |  |  | 6 |
Subtotal | 20,886 |  |  | 159 |  |  | 21,149 |  |  | 470 |
Total | $ | 44,558 |  |  | $ | 385 |  |  | $ | 45,318 |  |  | $ | 1,165 |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Acquired During Period | The following table displays certain information pertaining to PCI loans at the dates indicated:
| September 30, 2017 |  | December 31, 2016
| (Dollars in thousands)
Outstanding balance | $ | 17,025 |  |  | $ | 20,477 |
Carrying amount | $ | 15,172 |  |  | $ | 18,392 |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule | The following table summarizes activity in the accretable yield for the PCI loan portfolio:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (Dollars in thousands)
Beginning balance | $ | 2,185 |  |  | $ | 2,625 |  |  | $ | 2,370 |  |  | $ | 2,827 |
Accretion | (359 | ) |  | (359 | ) |  | (968 | ) |  | (1,188 | )
Other change in expected cash flows (1) | 167 |  |  | 213 |  |  | 573 |  |  | 744 |
Reclassification from nonaccretable difference for loans which have paid off (2) | 70 |  |  | — |  |  | 88 |  |  | 96 |
Ending balance | $ | 2,063 |  |  | $ | 2,479 |  |  | $ | 2,063 |  |  | $ | 2,479 |
(1) Represents changes in cash flows expected to be collected and resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s). (2) Results in increased interest income during the period in which the loan paid off at amount greater than originally expected.

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