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Allowance for Loan Losses (Tables) | 9 Months Ended
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Sep. 30, 2017
Receivables [Abstract] |
Age Analysis of Past Due Loans Segregated by Class of Loans | The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented:
| September 30, 2017
(dollars in thousands) | Current |  | 30-59 Days Past Due |  | 60-89 Days Past Due |  | Nonaccrual |  | Total Past Due |  | Total Loans
Commercial real estate | $ | 2,674,171 |  |  | $ | 530 |  |  | $ | 421 |  |  | $ | 6,571 |  |  | $ | 7,522 |  |  | $ | 2,681,693 |
Commercial and industrial | 1,438,224 |  |  | 499 |  |  | 739 |  |  | 7,349 |  |  | 8,587 |  |  | 1,446,811 |
Commercial construction | 428,744 |  |  | 75 |  |  | — |  |  | 4,068 |  |  | 4,143 |  |  | 432,887 |
Residential mortgage | 684,848 |  |  | 3,872 |  |  | 865 |  |  | 7,782 |  |  | 12,519 |  |  | 697,367 |
Home equity | 482,000 |  |  | 1,616 |  |  | 515 |  |  | 3,675 |  |  | 5,806 |  |  | 487,806 |
Installment and other consumer | 69,316 |  |  | 228 |  |  | 52 |  |  | 48 |  |  | 328 |  |  | 69,644 |
Consumer construction | 4,550 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,550 |
Loans held for sale | 47,936 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 47,936 |
Total | $ | 5,829,789 |  |  | $ | 6,820 |  |  | $ | 2,592 |  |  | $ | 29,493 |  |  | $ | 38,905 |  |  | $ | 5,868,694 |
| December 31, 2016
(dollars in thousands) | Current |  | 30-59 Days Past Due |  | 60-89 Days Past Due |  | Nonaccrual |  | Total Past Due |  | Total Loans
Commercial real estate | $ | 2,479,513 |  |  | $ | 2,032 |  |  | $ | 759 |  |  | $ | 16,172 |  |  | $ | 18,963 |  |  | $ | 2,498,476 |
Commercial and industrial | 1,391,475 |  |  | 1,061 |  |  | 428 |  |  | 8,071 |  |  | 9,560 |  |  | 1,401,035 |
Commercial construction | 450,410 |  |  | 547 |  |  | — |  |  | 4,927 |  |  | 5,474 |  |  | 455,884 |
Residential mortgage | 689,635 |  |  | 1,312 |  |  | 1,117 |  |  | 9,918 |  |  | 12,347 |  |  | 701,982 |
Home equity | 476,866 |  |  | 1,470 |  |  | 509 |  |  | 3,439 |  |  | 5,418 |  |  | 482,284 |
Installment and other consumer | 65,525 |  |  | 176 |  |  | 43 |  |  | 108 |  |  | 327 |  |  | 65,852 |
Consumer construction | 5,906 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,906 |
Loans held for sale | 3,793 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,793 |
Total | $ | 5,563,123 |  |  | $ | 6,598 |  |  | $ | 2,856 |  |  | $ | 42,635 |  |  | $ | 52,089 |  |  | $ | 5,615,212 |
Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings | The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:
| September 30, 2017
(dollars in thousands) | Commercial Real Estate | % of Total |  | Commercial and Industrial | % of Total |  | Commercial Construction | % of Total |  | Total | % of Total
Pass | $ | 2,587,393 |  | 96.5 | % |  | $ | 1,354,269 |  | 93.6 | % |  | $ | 411,379 |  | 95.0 | % |  | $ | 4,353,041 |  | 95.4 | %
Special mention | 55,218 |  | 2.1 | % |  | 53,853 |  | 3.7 | % |  | 11,503 |  | 2.7 | % |  | 120,574 |  | 2.6 | %
Substandard | 39,082 |  | 1.4 | % |  | 38,689 |  | 2.7 | % |  | 10,005 |  | 2.3 | % |  | 87,776 |  | 2.0 | %
Total | $ | 2,681,693 |  | 100.0 | % |  | $ | 1,446,811 |  | 100.0 | % |  | $ | 432,887 |  | 100.0 | % |  | $ | 4,561,391 |  | 100.0 | %
| December 31, 2016
(dollars in thousands) | Commercial Real Estate | % of Total |  | Commercial and Industrial | % of Total |  | Commercial Construction | % of Total |  | Total | % of Total
Pass | $ | 2,423,742 |  | 97.0 | % |  | $ | 1,315,507 |  | 93.9 | % |  | $ | 430,472 |  | 94.4 | % |  | $ | 4,169,721 |  | 95.7 | %
Special mention | 33,098 |  | 1.3 | % |  | 40,409 |  | 2.9 | % |  | 14,691 |  | 3.2 | % |  | 88,198 |  | 2.0 | %
Substandard | 41,636 |  | 1.7 | % |  | 45,119 |  | 3.2 | % |  | 10,721 |  | 2.4 | % |  | 97,476 |  | 2.3 | %
Total | $ | 2,498,476 |  | 100.0 | % |  | $ | 1,401,035 |  | 100.0 | % |  | $ | 455,884 |  | 100.0 | % |  | $ | 4,355,395 |  | 100.0 | %
Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status | The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:
| September 30, 2017
(dollars in thousands) | Residential Mortgage | % of Total |  | Home Equity | % of Total |  | Installment and other consumer | % of Total |  | Consumer Construction | % of Total |  | Total | % of Total
Performing | $ | 689,585 |  | 98.9 | % |  | $ | 484,131 |  | 99.2 | % |  | $ | 69,596 |  | 99.9 | % |  | $ | 4,550 |  | 100.0 | % |  | $ | 1,247,862 |  | 99.1 | %
Nonperforming | 7,782 |  | 1.1 | % |  | 3,675 |  | 0.8 | % |  | 48 |  | 0.1 | % |  | — |  | — | % |  | 11,505 |  | 0.9 | %
Total | $ | 697,367 |  | 100.0 | % |  | $ | 487,806 |  | 100.0 | % |  | $ | 69,644 |  | 100.0 | % |  | $ | 4,550 |  | 100.0 | % |  | $ | 1,259,367 |  | 100.0 | %
| December 31, 2016
(dollars in thousands) | Residential Mortgage | % of Total |  | Home Equity | % of Total |  | Installment and other consumer | % of Total |  | Consumer Construction | % of Total |  | Total | % of Total
Performing | $ | 692,064 |  | 98.6 | % |  | $ | 478,845 |  | 99.3 | % |  | $ | 65,744 |  | 99.8 | % |  | $ | 5,906 |  | 100.0 | % |  | $ | 1,242,559 |  | 98.9 | %
Nonperforming | 9,918 |  | 1.4 | % |  | 3,439 |  | 0.7 | % |  | 108 |  | 0.2 | % |  | — |  | — | % |  | 13,465 |  | 1.1 | %
Total | $ | 701,982 |  | 100.0 | % |  | $ | 482,284 |  | 100.0 | % |  | $ | 65,852 |  | 100.0 | % |  | $ | 5,906 |  | 100.0 | % |  | $ | 1,256,024 |  | 100.0 | %
Investments in Loans Considered to be Impaired and Related Information on Impaired Loans |
| Nine Months Ended
| September 30, 2017 |  | September 30, 2016
(dollars in thousands) | Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
With a related allowance recorded: |  |  |  |  |  |  |
Commercial real estate | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial and industrial | 1,218 |  |  | 44 |  |  | 2,492 |  |  | 100 |
Commercial construction | — |  |  | — |  |  | — |  |  | — |
Consumer real estate | 24 |  |  | 1 |  |  | 29 |  |  | 2 |
Other consumer | 35 |  |  | 1 |  |  | 2 |  |  | — |
Total with a Related Allowance Recorded | 1,277 |  |  | 46 |  |  | 2,523 |  |  | 102 |
Without a related allowance recorded: |  |  |  |  |  |  |
Commercial real estate | 6,577 |  |  | 140 |  |  | 7,551 |  |  | 106 |
Commercial and industrial | 11,001 |  |  | 164 |  |  | 7,447 |  |  | 156 |
Commercial construction | 7,222 |  |  | 194 |  |  | 8,498 |  |  | 143 |
Consumer real estate | 11,488 |  |  | 382 |  |  | 11,831 |  |  | 400 |
Other consumer | 33 |  |  | 1 |  |  | 38 |  |  | 1 |
Total without a Related Allowance Recorded | 36,321 |  |  | 881 |  |  | 35,365 |  |  | 806 |
Total: |  |  |  |  |  |  |
Commercial real estate | 6,577 |  |  | 140 |  |  | 7,551 |  |  | 106 |
Commercial and industrial | 12,219 |  |  | 208 |  |  | 9,939 |  |  | 256 |
Commercial construction | 7,222 |  |  | 194 |  |  | 8,498 |  |  | 143 |
Consumer real estate | 11,512 |  |  | 383 |  |  | 11,860 |  |  | 402 |
Other consumer | 68 |  |  | 2 |  |  | 40 |  |  | 1 |
Total | $ | 37,598 |  |  | $ | 927 |  |  | $ | 37,888 |  |  | $ | 908 |
The following table summarizes investments in loans considered to be impaired and related information on those impaired loans as of the dates presented:
| September 30, 2017 |  | December 31, 2016
(dollars in thousands) | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance
With a related allowance recorded: |  |  |  |  |  |  |  |  |  |  |
Commercial real estate | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial and industrial | 2,468 |  |  | 2,501 |  |  | 260 |  |  | 964 |  |  | 2,433 |  |  | 771 |
Commercial construction | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Consumer real estate | 22 |  |  | 22 |  |  | 22 |  |  | 26 |  |  | 26 |  |  | 26 |
Other consumer | 30 |  |  | 30 |  |  | 30 |  |  | 1 |  |  | 1 |  |  | 1 |
Total with a Related Allowance Recorded | 2,520 |  |  | 2,553 |  |  | 312 |  |  | 991 |  |  | 2,460 |  |  | 798 |
Without a related allowance recorded: |  |  |  |  |  |  |  |  |  |  |
Commercial real estate | 6,341 |  |  | 6,985 |  |  | — |  |  | 16,352 |  |  | 17,654 |  |  | — |
Commercial and industrial | 6,075 |  |  | 8,245 |  |  | — |  |  | 5,902 |  |  | 7,699 |  |  | — |
Commercial construction | 5,974 |  |  | 8,629 |  |  | — |  |  | 6,613 |  |  | 10,306 |  |  | — |
Consumer real estate | 11,054 |  |  | 11,979 |  |  | — |  |  | 12,053 |  |  | 12,849 |  |  | — |
Other consumer | 24 |  |  | 30 |  |  | — |  |  | 24 |  |  | 31 |  |  | — |
Total without a Related Allowance Recorded | 29,468 |  |  | 35,868 |  |  | — |  |  | 40,944 |  |  | 48,539 |  |  | — |
Total: |  |  |  |  |  |  |  |  |  |  |
Commercial real estate | 6,341 |  |  | 6,985 |  |  | — |  |  | 16,352 |  |  | 17,654 |  |  | — |
Commercial and industrial | 8,543 |  |  | 10,746 |  |  | 260 |  |  | 6,866 |  |  | 10,132 |  |  | 771 |
Commercial construction | 5,974 |  |  | 8,629 |  |  | — |  |  | 6,613 |  |  | 10,306 |  |  | — |
Consumer real estate | 11,076 |  |  | 12,001 |  |  | 22 |  |  | 12,079 |  |  | 12,875 |  |  | 26 |
Other consumer | 54 |  |  | 60 |  |  | 30 |  |  | 25 |  |  | 32 |  |  | 1 |
Total | $ | 31,988 |  |  | $ | 38,421 |  |  | $ | 312 |  |  | $ | 41,935 |  |  | $ | 50,999 |  |  | $ | 798 |
The following table summarizes average recorded investment in and interest income recognized on loans considered to be impaired for the periods presented:
| For the Three Months Ended
| September 30, 2017 |  | September 30, 2016
(dollars in thousands) | Average Recorded Investment |  | Interest Income Recognized |  | Average Recorded Investment |  | Interest Income Recognized
With a related allowance recorded: |  |  |  |  |  |  |
Commercial real estate | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commercial and industrial | 2,406 |  |  | 37 |  |  | 2,437 |  |  | 37 |
Commercial construction | — |  |  | — |  |  | — |  |  | — |
Consumer real estate | 23 |  |  | 1 |  |  | 28 |  |  | — |
Other consumer | 32 |  |  | 2 |  |  | 2 |  |  | — |
Total with a Related Allowance Recorded | 2,461 |  |  | 40 |  |  | 2,467 |  |  | 37 |
Without a related allowance recorded: |  |  |  |  |  |  |
Commercial real estate | 6,415 |  |  | 105 |  |  | 7,582 |  |  | 38 |
Commercial and industrial | 9,074 |  |  | 130 |  |  | 7,326 |  |  | 52 |
Commercial construction | 7,140 |  |  | 154 |  |  | 8,039 |  |  | 49 |
Consumer real estate | 11,149 |  |  | 250 |  |  | 11,686 |  |  | 159 |
Other consumer | 28 |  |  | — |  |  | 32 |  |  | — |
Total without a Related Allowance Recorded | 33,806 |  |  | 639 |  |  | 34,665 |  |  | 298 |
Total: |  |  |  |  |  |  |
Commercial real estate | 6,415 |  |  | 105 |  |  | 7,582 |  |  | 38 |
Commercial and industrial | 11,480 |  |  | 167 |  |  | 9,763 |  |  | 89 |
Commercial construction | 7,140 |  |  | 154 |  |  | 8,039 |  |  | 49 |
Consumer real estate | 11,172 |  |  | 251 |  |  | 11,714 |  |  | 159 |
Other consumer | 60 |  |  | 2 |  |  | 34 |  |  | — |
Total | $ | 36,267 |  |  | $ | 679 |  |  | $ | 37,132 |  |  | $ | 335 |
Summary of Allowance for Loan Losses | The following tables detail activity in the ALL for the periods presented:
| Three Months Ended September 30, 2017
(dollars in thousands) | Commercial Real Estate |  | Commercial and Industrial |  | Commercial Construction |  | Consumer Real Estate |  | Other Consumer |  | Total Loans
Balance at beginning of period | $ | 24,358 |  |  | $ | 9,256 |  |  | $ | 13,944 |  |  | $ | 5,803 |  |  | $ | 1,990 |  |  | $ | 55,351 |
Charge-offs | (37 | ) |  | (644 | ) |  | (1,453 | ) |  | (101 | ) |  | (425 | ) |  | (2,660 | )
Recoveries | 182 |  |  | 243 |  |  | 473 |  |  | 91 |  |  | 182 |  |  | 1,171 |
Net (Charge-offs)/ Recoveries | 145 |  |  | (401 | ) |  | (980 | ) |  | (10 | ) |  | (243 | ) |  | (1,489 | )
Provision for loan losses | 472 |  |  | 859 |  |  | 1,951 |  |  | (262 | ) |  | (170 | ) |  | 2,850 |
Balance at End of Period | $ | 24,975 |  |  | $ | 9,714 |  |  | $ | 14,915 |  |  | $ | 5,531 |  |  | $ | 1,577 |  |  | $ | 56,712 |
| Three Months Ended September 30, 2016
(dollars in thousands) | Commercial Real Estate |  | Commercial and Industrial |  | Commercial Construction |  | Consumer Real Estate |  | Other Consumer |  | Total Loans
Balance at beginning of period | $ | 15,978 |  |  | $ | 14,771 |  |  | $ | 11,701 |  |  | $ | 8,418 |  |  | $ | 1,345 |  |  | $ | 52,213 |
Charge-offs | (93 | ) |  | (414 | ) |  | (163 | ) |  | (369 | ) |  | (461 | ) |  | (1,500 | )
Recoveries | 264 |  |  | 169 |  |  | 17 |  |  | 44 |  |  | 70 |  |  | 564 |
Net (Charge-offs)/ Recoveries | 171 |  |  | (245 | ) |  | (146 | ) |  | (325 | ) |  | (391 | ) |  | (936 | )
Provision for loan losses | 4,244 |  |  | (2,232 | ) |  | 1,356 |  |  | (1,760 | ) |  | 908 |  |  | 2,516 |
Balance at End of Period | $ | 20,393 |  |  | $ | 12,294 |  |  | $ | 12,911 |  |  | $ | 6,333 |  |  | $ | 1,862 |  |  | $ | 53,793 |
| Nine Months Ended September 30, 2017
(dollars in thousands) | Commercial Real Estate |  | Commercial and Industrial |  | Commercial Construction |  | Consumer Real Estate |  | Other Consumer |  | Total Loans
Balance at beginning of period | $ | 19,976 |  |  | $ | 10,810 |  |  | $ | 13,999 |  |  | $ | 6,095 |  |  | $ | 1,895 |  |  | $ | 52,775 |
Charge-offs | (2,100 | ) |  | (4,041 | ) |  | (2,097 | ) |  | (1,957 | ) |  | (1,228 | ) |  | (11,423 | )
Recoveries | 415 |  |  | 499 |  |  | 842 |  |  | 270 |  |  | 433 |  |  | 2,459 |
Net (Charge-offs)/Recoveries | (1,685 | ) |  | (3,542 | ) |  | (1,255 | ) |  | (1,687 | ) |  | (795 | ) |  | (8,964 | )
Provision for loan losses | 6,684 |  |  | 2,446 |  |  | 2,171 |  |  | 1,123 |  |  | 477 |  |  | 12,901 |
Balance at End of Period | $ | 24,975 |  |  | $ | 9,714 |  |  | $ | 14,915 |  |  | $ | 5,531 |  |  | $ | 1,577 |  |  | $ | 56,712 |
| Nine Months Ended September 30, 2016
(dollars in thousands) | Commercial Real Estate |  | Commercial and Industrial |  | Commercial Construction |  | Consumer Real Estate |  | Other Consumer |  | Total Loans
Balance at beginning of period | $ | 15,043 |  |  | $ | 10,853 |  |  | $ | 12,625 |  |  | $ | 8,400 |  |  | $ | 1,226 |  |  | $ | 48,147 |
Charge-offs | (1,808 | ) |  | (3,244 | ) |  | (1,108 | ) |  | (891 | ) |  | (1,572 | ) |  | (8,623 | )
Recoveries | 662 |  |  | 589 |  |  | 20 |  |  | 342 |  |  | 277 |  |  | 1,890 |
Net (Charge-offs)/Recoveries | (1,146 | ) |  | (2,655 | ) |  | (1,088 | ) |  | (549 | ) |  | (1,295 | ) |  | (6,733 | )
Provision for loan losses | 6,496 |  |  | 4,096 |  |  | 1,374 |  |  | (1,518 | ) |  | 1,931 |  |  | 12,379 |
Balance at End of Period | $ | 20,393 |  |  | $ | 12,294 |  |  | $ | 12,911 |  |  | $ | 6,333 |  |  | $ | 1,862 |  |  | $ | 53,793 |
Summary of Allowance for Loan Losses and Recorded Investments | The following tables present the ALL and recorded investments in loans by category as of the periods presented:
| September 30, 2017
| Allowance for Loan Losses |  | Portfolio Loans
(dollars in thousands) | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |  |  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |
Commercial real estate | $ | — |  |  | $ | 24,975 |  |  | $ | 24,975 |  |  | $ | 6,341 |  |  | $ | 2,675,352 |  |  | $ | 2,681,693 |
Commercial and industrial | 260 |  |  | 9,454 |  |  | 9,714 |  |  | 8,543 |  |  | 1,438,268 |  |  | 1,446,811 |
Commercial construction | — |  |  | 14,915 |  |  | 14,915 |  |  | 5,974 |  |  | 426,913 |  |  | 432,887 |
Consumer real estate | 22 |  |  | 5,509 |  |  | 5,531 |  |  | 11,076 |  |  | 1,178,647 |  |  | 1,189,723 |
Other consumer | 30 |  |  | 1,547 |  |  | 1,577 |  |  | 54 |  |  | 69,590 |  |  | 69,644 |
Total | $ | 312 |  |  | $ | 56,400 |  |  | $ | 56,712 |  |  | $ | 31,988 |  |  | $ | 5,788,770 |  |  | $ | 5,820,758 |
| December 31, 2016
| Allowance for Loan Losses |  | Portfolio Loans
(dollars in thousands) | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |  |  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |
Commercial real estate | $ | — |  |  | $ | 19,976 |  |  | $ | 19,976 |  |  | $ | 16,352 |  |  | $ | 2,482,124 |  |  | $ | 2,498,476 |
Commercial and industrial | 771 |  |  | 10,039 |  |  | 10,810 |  |  | 6,866 |  |  | 1,394,169 |  |  | 1,401,035 |
Commercial construction | — |  |  | 13,999 |  |  | 13,999 |  |  | 6,613 |  |  | 449,271 |  |  | 455,884 |
Consumer real estate | 26 |  |  | 6,069 |  |  | 6,095 |  |  | 12,079 |  |  | 1,178,093 |  |  | 1,190,172 |
Other consumer | 1 |  |  | 1,894 |  |  | 1,895 |  |  | 25 |  |  | 65,827 |  |  | 65,852 |
Total | $ | 798 |  |  | $ | 51,977 |  |  | $ | 52,775 |  |  | $ | 41,935 |  |  | $ | 5,569,484 |  |  | $ | 5,611,419 |

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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=82894031&loc=SL6953803-111525 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953659-111524 + Details
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- Definition Tabular disclosure of impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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