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Allowance for Loan and Lease Losses (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of components of allowance for loan and lease losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, 2019
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 31,793 | ​ | $ | 21,197 | ​ | $ | 5,381 | ​ | $ | 411 | ​ | $ | 44,911 | ​ | $ | 35,099 | ​ | $ | 2,754 | ​ | $ | 141,546
Charge-offs | ​ | ​ | (2,000) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,505) | ​ | ​ | — | ​ | ​ | (9,505)
Recoveries | ​ | ​ | 25 | ​ | ​ | 32 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 185 | ​ | ​ | 2,382 | ​ | ​ | — | ​ | ​ | 2,624
Increase (decrease) in Provision | ​ | ​ | 1,870 | ​ | ​ | 975 | ​ | ​ | (367) | ​ | ​ | 35 | ​ | ​ | (1,676) | ​ | ​ | 3,662 | ​ | ​ | (629) | ​ | ​ | 3,870
Balance at end of period | ​ | $ | 31,688 | ​ | $ | 22,204 | ​ | $ | 5,014 | ​ | $ | 446 | ​ | $ | 43,420 | ​ | $ | 33,638 | ​ | $ | 2,125 | ​ | $ | 138,535
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2019
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 34,501 | ​ | $ | 19,725 | ​ | $ | 5,813 | ​ | $ | 432 | ​ | $ | 44,906 | ​ | $ | 35,813 | ​ | $ | 528 | ​ | $ | 141,718
Charge-offs | ​ | ​ | (2,000) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | — | ​ | ​ | (16,103) | ​ | ​ | — | ​ | ​ | (18,127)
Recoveries | ​ | ​ | 62 | ​ | ​ | 63 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 435 | ​ | ​ | 4,834 | ​ | ​ | — | ​ | ​ | 5,394
Increase (decrease) in Provision | ​ | ​ | (875) | ​ | ​ | 2,416 | ​ | ​ | (799) | ​ | ​ | 38 | ​ | ​ | (1,921) | ​ | ​ | 9,094 | ​ | ​ | 1,597 | ​ | ​ | 9,550
Balance at end of period | ​ | $ | 31,688 | ​ | $ | 22,204 | ​ | $ | 5,014 | ​ | $ | 446 | ​ | $ | 43,420 | ​ | $ | 33,638 | ​ | $ | 2,125 | ​ | $ | 138,535
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, 2018
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 34,365 | ​ | $ | 19,254 | ​ | $ | 5,976 | ​ | $ | 585 | ​ | $ | 43,220 | ​ | $ | 30,998 | ​ | $ | 4,176 | ​ | $ | 138,574
Charge-offs | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (34) | ​ | ​ | (6,290) | ​ | ​ | — | ​ | ​ | (6,324)
Recoveries | ​ | ​ | 39 | ​ | ​ | 32 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 60 | ​ | ​ | 2,200 | ​ | ​ | — | ​ | ​ | 2,331
Increase (decrease) in Provision | ​ | ​ | 835 | ​ | ​ | 1,221 | ​ | ​ | 1,630 | ​ | ​ | (28) | ​ | ​ | 679 | ​ | ​ | 4,601 | ​ | ​ | (2,918) | ​ | ​ | 6,020
Balance at end of period | ​ | $ | 35,239 | ​ | $ | 20,507 | ​ | $ | 7,606 | ​ | $ | 557 | ​ | $ | 43,925 | ​ | $ | 31,509 | ​ | $ | 1,258 | ​ | $ | 140,601
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2018
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 34,006 | ​ | $ | 18,044 | ​ | $ | 6,817 | ​ | $ | 611 | ​ | $ | 42,852 | ​ | $ | 31,249 | ​ | $ | 3,674 | ​ | $ | 137,253
Charge-offs | ​ | ​ | (475) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (34) | ​ | ​ | (12,915) | ​ | ​ | — | ​ | ​ | (13,424)
Recoveries | ​ | ​ | 103 | ​ | ​ | 154 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 242 | ​ | ​ | 4,303 | ​ | ​ | — | ​ | ​ | 4,802
Increase (decrease) in Provision | ​ | ​ | 1,605 | ​ | ​ | 2,309 | ​ | ​ | 789 | ​ | ​ | (54) | ​ | ​ | 865 | ​ | ​ | 8,872 | ​ | ​ | (2,416) | ​ | ​ | 11,970
Balance at end of period | ​ | $ | 35,239 | ​ | $ | 20,507 | ​ | $ | 7,606 | ​ | $ | 557 | ​ | $ | 43,925 | ​ | $ | 31,509 | ​ | $ | 1,258 | ​ | $ | 140,601
​
Schedule of disaggregation of Allowance and recorded investment in loans by impairment methodology | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually evaluated for impairment | ​ | $ | 108 | ​ | $ | 25 | ​ | $ | — | ​ | $ | — | ​ | $ | 367 | ​ | $ | — | ​ | $ | — | ​ | $ | 500
Collectively evaluated for impairment | ​ | ​ | 31,580 | ​ | ​ | 22,179 | ​ | ​ | 5,014 | ​ | ​ | 446 | ​ | ​ | 43,053 | ​ | ​ | 33,638 | ​ | ​ | 2,125 | ​ | ​ | 138,035
Balance at end of period | ​ | $ | 31,688 | ​ | $ | 22,204 | ​ | $ | 5,014 | ​ | $ | 446 | ​ | $ | 43,420 | ​ | $ | 33,638 | ​ | $ | 2,125 | ​ | $ | 138,535
Loans and leases: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually evaluated for impairment | ​ | $ | 8,882 | ​ | $ | 3,726 | ​ | $ | — | ​ | $ | — | ​ | $ | 14,805 | ​ | $ | — | ​ | $ | — | ​ | $ | 27,413
Collectively evaluated for impairment | ​ | ​ | 3,168,962 | ​ | ​ | 3,190,493 | ​ | ​ | 549,578 | ​ | ​ | 165,370 | ​ | ​ | 4,512,080 | ​ | ​ | 1,650,713 | ​ | ​ | — | ​ | ​ | 13,237,196
Balance at end of period | ​ | $ | 3,177,844 | ​ | $ | 3,194,219 | ​ | $ | 549,578 | ​ | $ | 165,370 | ​ | $ | 4,526,885 | ​ | $ | 1,650,713 | ​ | $ | — | ​ | $ | 13,264,609
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
​ | ​ | Commercial Lending | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Residential |  | Consumer |  | Unallocated |  | Total
Allowance for loan and lease losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually evaluated for impairment | ​ | $ | 108 | ​ | $ | 32 | ​ | $ | — | ​ | $ | — | ​ | $ | 396 | ​ | $ | — | ​ | $ | — | ​ | $ | 536
Collectively evaluated for impairment | ​ | ​ | 34,393 | ​ | ​ | 19,693 | ​ | ​ | 5,813 | ​ | ​ | 432 | ​ | ​ | 44,510 | ​ | ​ | 35,813 | ​ | ​ | 528 | ​ | ​ | 141,182
Balance at end of period | ​ | $ | 34,501 | ​ | $ | 19,725 | ​ | $ | 5,813 | ​ | $ | 432 | ​ | $ | 44,906 | ​ | $ | 35,813 | ​ | $ | 528 | ​ | $ | 141,718
Loans and leases: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually evaluated for impairment | ​ | $ | 8,719 | ​ | $ | 5,743 | ​ | $ | — | ​ | $ | — | ​ | $ | 16,114 | ​ | $ | — | ​ | $ | — | ​ | $ | 30,576
Collectively evaluated for impairment | ​ | ​ | 3,200,041 | ​ | ​ | 2,985,040 | ​ | ​ | 626,757 | ​ | ​ | 147,769 | ​ | ​ | 4,423,504 | ​ | ​ | 1,662,504 | ​ | ​ | — | ​ | ​ | 13,045,615
Balance at end of period | ​ | $ | 3,208,760 | ​ | $ | 2,990,783 | ​ | $ | 626,757 | ​ | $ | 147,769 | ​ | $ | 4,439,618 | ​ | $ | 1,662,504 | ​ | $ | — | ​ | $ | 13,076,191
Schedule of credit risk profiles by internally assigned grade for loans and leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Total
Grade: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pass | ​ | $ | 3,048,463 | ​ | $ | 3,021,877 | ​ | $ | 548,480 | ​ | $ | 164,245 | ​ | $ | 6,783,065
Special mention | ​ | ​ | 90,410 | ​ | ​ | 127,097 | ​ | ​ | 171 | ​ | ​ | 984 | ​ | ​ | 218,662
Substandard | ​ | ​ | 38,971 | ​ | ​ | 45,245 | ​ | ​ | 927 | ​ | ​ | 141 | ​ | ​ | 85,284
Total | ​ | $ | 3,177,844 | ​ | $ | 3,194,219 | ​ | $ | 549,578 | ​ | $ | 165,370 | ​ | $ | 7,087,011
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Total
Grade: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pass | ​ | $ | 3,069,546 | ​ | $ | 2,876,907 | ​ | $ | 625,607 | ​ | $ | 146,356 | ​ | $ | 6,718,416
Special mention | ​ | ​ | 57,012 | ​ | ​ | 91,298 | ​ | ​ | 200 | ​ | ​ | 1,223 | ​ | ​ | 149,733
Substandard | ​ | ​ | 82,010 | ​ | ​ | 22,578 | ​ | ​ | 950 | ​ | ​ | 190 | ​ | ​ | 105,728
Doubtful | ​ | ​ | 192 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 192
Total | ​ | $ | 3,208,760 | ​ | $ | 2,990,783 | ​ | $ | 626,757 | ​ | $ | 147,769 | ​ | $ | 6,974,069
Schedule of credit risk profiles based on payment activity for loans and leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019
(dollars in thousands) |  | Residential Mortgage |  | Home Equity Line |  | Consumer |  | Consumer - Auto |  | Credit Cards |  | Total
Performing | ​ | $ | 3,609,720 | ​ | $ | 903,257 | ​ | $ | 231,355 | ​ | $ | 1,060,248 | ​ | $ | 325,746 | ​ | $ | 6,130,326
Non-performing and delinquent | ​ | ​ | 8,713 | ​ | ​ | 5,195 | ​ | ​ | 5,909 | ​ | ​ | 22,695 | ​ | ​ | 4,760 | ​ | ​ | 47,272
Total | ​ | $ | 3,618,433 | ​ | $ | 908,452 | ​ | $ | 237,264 | ​ | $ | 1,082,943 | ​ | $ | 330,506 | ​ | $ | 6,177,598
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
(dollars in thousands) |  | Residential Mortgage |  | Home Equity Line |  | Consumer |  | Consumer - Auto |  | Credit Cards |  | Total
Performing | ​ | $ | 3,519,172 | ​ | $ | 903,284 | ​ | $ | 234,458 | ​ | $ | 1,044,393 | ​ | $ | 339,162 | ​ | $ | 6,040,469
Non-performing and delinquent | ​ | ​ | 7,929 | ​ | ​ | 9,233 | ​ | ​ | 5,448 | ​ | ​ | 33,739 | ​ | ​ | 5,304 | ​ | ​ | 61,653
Total | ​ | $ | 3,527,101 | ​ | $ | 912,517 | ​ | $ | 239,906 | ​ | $ | 1,078,132 | ​ | $ | 344,466 | ​ | $ | 6,102,122
Schedule of aging analyses of past due loans and leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019
​ | ​ | Accruing Loans and Leases | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Greater | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total Non | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Than or | ​ | ​ | ​ | ​ | ​ | Total | ​ | Accruing | ​ | ​
​ | ​ | 30-59 | ​ | 60-89 | ​ | Equal to | ​ | Total | ​ | ​ | ​ | Accruing | ​ | Loans | ​ | ​
​ | ​ | Days | ​ | Days | ​ | 90 Days | ​ | Past | ​ | ​ | ​ | Loans and | ​ | and | ​ | Total
(dollars in thousands) |  | Past Due |  | Past Due |  | Past Due |  | Due |  | Current |  | Leases |  | Leases |  | Outstanding
Commercial and industrial | ​ | $ | 1,213 | ​ | $ | 2,247 | ​ | $ | 807 | ​ | $ | 4,267 | ​ | $ | 3,173,458 | ​ | $ | 3,177,725 | ​ | $ | 119 | ​ | $ | 3,177,844
Commercial real estate | ​ | ​ | 124 | ​ | ​ | 195 | ​ | ​ | — | ​ | ​ | 319 | ​ | ​ | 3,193,900 | ​ | ​ | 3,194,219 | ​ | ​ | — | ​ | ​ | 3,194,219
Construction | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 549,578 | ​ | ​ | 549,578 | ​ | ​ | — | ​ | ​ | 549,578
Lease financing | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 165,370 | ​ | ​ | 165,370 | ​ | ​ | — | ​ | ​ | 165,370
Residential mortgage | ​ | ​ | 3,223 | ​ | ​ | 1,719 | ​ | ​ | — | ​ | ​ | 4,942 | ​ | ​ | 3,609,720 | ​ | ​ | 3,614,662 | ​ | ​ | 3,771 | ​ | ​ | 3,618,433
Home equity line | ​ | ​ | 3,116 | ​ | ​ | 444 | ​ | ​ | 1,635 | ​ | ​ | 5,195 | ​ | ​ | 903,257 | ​ | ​ | 908,452 | ​ | ​ | — | ​ | ​ | 908,452
Consumer | ​ | ​ | 24,596 | ​ | ​ | 5,473 | ​ | ​ | 3,295 | ​ | ​ | 33,364 | ​ | ​ | 1,617,349 | ​ | ​ | 1,650,713 | ​ | ​ | — | ​ | ​ | 1,650,713
Total | ​ | $ | 32,272 | ​ | $ | 10,078 | ​ | $ | 5,737 | ​ | $ | 48,087 | ​ | $ | 13,212,632 | ​ | $ | 13,260,719 | ​ | $ | 3,890 | ​ | $ | 13,264,609
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
​ | ​ | Accruing Loans and Leases | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Greater | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total Non | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Than or | ​ | ​ | ​ | ​ | ​ | Total | ​ | Accruing | ​ | ​
​ | ​ | 30-59 | ​ | 60-89 | ​ | Equal to | ​ | Total | ​ | ​ | ​ | Accruing | ​ | Loans | ​ | ​
​ | ​ | Days | ​ | Days | ​ | 90 Days | ​ | Past | ​ | ​ | ​ | Loans and | ​ | and | ​ | Total
(dollars in thousands) |  | Past Due |  | Past Due |  | Past Due |  | Due |  | Current |  | Leases |  | Leases |  | Outstanding
Commercial and industrial | ​ | $ | 1,293 | ​ | $ | — | ​ | $ | 141 | ​ | $ | 1,434 | ​ | $ | 3,207,052 | ​ | $ | 3,208,486 | ​ | $ | 274 | ​ | $ | 3,208,760
Commercial real estate | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,989,125 | ​ | ​ | 2,989,125 | ​ | ​ | 1,658 | ​ | ​ | 2,990,783
Construction | ​ | ​ | 91 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 91 | ​ | ​ | 626,666 | ​ | ​ | 626,757 | ​ | ​ | — | ​ | ​ | 626,757
Lease financing | ​ | ​ | 47 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 47 | ​ | ​ | 147,722 | ​ | ​ | 147,769 | ​ | ​ | — | ​ | ​ | 147,769
Residential mortgage | ​ | ​ | 2,274 | ​ | ​ | 1,012 | ​ | ​ | 32 | ​ | ​ | 3,318 | ​ | ​ | 3,519,172 | ​ | ​ | 3,522,490 | ​ | ​ | 4,611 | ​ | ​ | 3,527,101
Home equity line | ​ | ​ | 5,616 | ​ | ​ | 775 | ​ | ​ | 2,842 | ​ | ​ | 9,233 | ​ | ​ | 903,284 | ​ | ​ | 912,517 | ​ | ​ | — | ​ | ​ | 912,517
Consumer | ​ | ​ | 32,406 | ​ | ​ | 8,712 | ​ | ​ | 3,373 | ​ | ​ | 44,491 | ​ | ​ | 1,618,013 | ​ | ​ | 1,662,504 | ​ | ​ | — | ​ | ​ | 1,662,504
Total | ​ | $ | 41,727 | ​ | $ | 10,499 | ​ | $ | 6,388 | ​ | $ | 58,614 | ​ | $ | 13,011,034 | ​ | $ | 13,069,648 | ​ | $ | 6,543 | ​ | $ | 13,076,191
​
Schedule of total carrying amounts and total unpaid principal balances of impaired loans and leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019
​ | ​ | ​ | ​ | Unpaid | ​ | ​
​ | ​ | Recorded | ​ | Principal | ​ | Related
(dollars in thousands) |  | Investment |  | Balance |  | Allowance
Impaired loans with no related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 5,278 | ​ | $ | 5,311 | ​ | $ | —
Commercial real estate | ​ | ​ | 3,016 | ​ | ​ | 3,016 | ​ | ​ | —
Residential mortgage | ​ | ​ | 7,675 | ​ | ​ | 7,834 | ​ | ​ | —
Total | ​ | $ | 15,969 | ​ | $ | 16,161 | ​ | $ | —
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 3,604 | ​ | $ | 3,604 | ​ | $ | 108
Commercial real estate | ​ | ​ | 710 | ​ | ​ | 710 | ​ | ​ | 25
Residential mortgage | ​ | ​ | 7,130 | ​ | ​ | 7,516 | ​ | ​ | 367
Total | ​ | $ | 11,444 | ​ | $ | 11,830 | ​ | $ | 500
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 8,882 | ​ | $ | 8,915 | ​ | $ | 108
Commercial real estate | ​ | ​ | 3,726 | ​ | ​ | 3,726 | ​ | ​ | 25
Residential mortgage | ​ | ​ | 14,805 | ​ | ​ | 15,350 | ​ | ​ | 367
Total | ​ | $ | 27,413 | ​ | $ | 27,991 | ​ | $ | 500
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2018
​ | ​ | ​ | ​ | Unpaid | ​ | ​
​ | ​ | Recorded | ​ | Principal | ​ | Related
(dollars in thousands) |  | Investment |  | Balance |  | Allowance
Impaired loans with no related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 4,449 | ​ | $ | 4,498 | ​ | $ | —
Commercial real estate | ​ | ​ | 5,016 | ​ | ​ | 5,016 | ​ | ​ | —
Residential mortgage | ​ | ​ | 9,112 | ​ | ​ | 9,426 | ​ | ​ | —
Total | ​ | $ | 18,577 | ​ | $ | 18,940 | ​ | $ | —
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 4,270 | ​ | $ | 4,270 | ​ | $ | 108
Commercial real estate | ​ | ​ | 727 | ​ | ​ | 727 | ​ | ​ | 32
Residential mortgage | ​ | ​ | 7,002 | ​ | ​ | 7,387 | ​ | ​ | 396
Total | ​ | $ | 11,999 | ​ | $ | 12,384 | ​ | $ | 536
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 8,719 | ​ | $ | 8,768 | ​ | $ | 108
Commercial real estate | ​ | ​ | 5,743 | ​ | ​ | 5,743 | ​ | ​ | 32
Residential mortgage | ​ | ​ | 16,114 | ​ | ​ | 16,813 | ​ | ​ | 396
Total | ​ | $ | 30,576 | ​ | $ | 31,324 | ​ | $ | 536
Schedule of average balances, and of interest income recognized from, impaired loans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, 2019 | ​ | June 30, 2019
​ | ​ | Average | ​ | Interest | ​ | Average | ​ | Interest
​ | ​ | Recorded | ​ | Income | ​ | Recorded | ​ | Income
(dollars in thousands) |  | Investment |  | Recognized |  | Investment |  | Recognized
Impaired loans with no related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 3,833 | ​ | $ | 94 | ​ | $ | 4,038 | ​ | $ | 175
Commercial real estate | ​ | ​ | 3,102 | ​ | ​ | 40 | ​ | ​ | 3,740 | ​ | ​ | 212
Residential mortgage | ​ | ​ | 7,948 | ​ | ​ | 92 | ​ | ​ | 8,336 | ​ | ​ | 191
Total | ​ | $ | 14,883 | ​ | $ | 226 | ​ | $ | 16,114 | ​ | $ | 578
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 5,645 | ​ | $ | 61 | ​ | $ | 5,187 | ​ | $ | 117
Commercial real estate | ​ | ​ | 715 | ​ | ​ | 10 | ​ | ​ | 719 | ​ | ​ | 20
Residential mortgage | ​ | ​ | 7,220 | ​ | ​ | 103 | ​ | ​ | 7,147 | ​ | ​ | 199
Total | ​ | $ | 13,580 | ​ | $ | 174 | ​ | $ | 13,053 | ​ | $ | 336
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 9,478 | ​ | $ | 155 | ​ | $ | 9,225 | ​ | $ | 292
Commercial real estate | ​ | ​ | 3,817 | ​ | ​ | 50 | ​ | ​ | 4,459 | ​ | ​ | 232
Residential mortgage | ​ | ​ | 15,168 | ​ | ​ | 195 | ​ | ​ | 15,483 | ​ | ​ | 390
Total | ​ | $ | 28,463 | ​ | $ | 400 | ​ | $ | 29,167 | ​ | $ | 914
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, 2018 | ​ | June 30, 2018
​ | ​ | Average | ​ | Interest | ​ | Average | ​ | Interest
​ | ​ | Recorded | ​ | Income | ​ | Recorded | ​ | Income
(dollars in thousands) |  | Investment |  | Recognized |  | Investment |  | Recognized
Impaired loans with no related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 15,815 | ​ | $ | 171 | ​ | $ | 16,556 | ​ | $ | 337
Commercial real estate | ​ | ​ | 9,144 | ​ | ​ | 72 | ​ | ​ | 9,345 | ​ | ​ | 127
Construction | ​ | ​ | 2,120 | ​ | ​ | — | ​ | ​ | 1,413 | ​ | ​ | —
Residential mortgage | ​ | ​ | 9,475 | ​ | ​ | 110 | ​ | ​ | 9,199 | ​ | ​ | 240
Total | ​ | $ | 36,554 | ​ | $ | 353 | ​ | $ | 36,513 | ​ | $ | 704
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 749 | ​ | $ | 18 | ​ | $ | 548 | ​ | $ | 35
Commercial real estate | ​ | ​ | 878 | ​ | ​ | 10 | ​ | ​ | 882 | ​ | ​ | 20
Residential mortgage | ​ | ​ | 7,456 | ​ | ​ | 113 | ​ | ​ | 7,598 | ​ | ​ | 197
Total | ​ | $ | 9,083 | ​ | $ | 141 | ​ | $ | 9,028 | ​ | $ | 252
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 16,564 | ​ | $ | 189 | ​ | $ | 17,104 | ​ | $ | 372
Commercial real estate | ​ | ​ | 10,022 | ​ | ​ | 82 | ​ | ​ | 10,227 | ​ | ​ | 147
Construction | ​ | ​ | 2,120 | ​ | ​ | — | ​ | ​ | 1,413 | ​ | ​ | —
Residential mortgage | ​ | ​ | 16,931 | ​ | ​ | 223 | ​ | ​ | 16,797 | ​ | ​ | 437
Total | ​ | $ | 45,637 | ​ | $ | 494 | ​ | $ | 45,541 | ​ | $ | 956
Schedule of information related to loans modified in a TDR | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, 2019 | ​ | June 30, 2019
​ | ​ | Number of | ​ | Recorded | ​ | Related | ​ | Number of | ​ | Recorded | ​ | Related
(dollars in thousands) |  | Contracts |  | Investment(1) |  | Allowance |  | Contracts |  | Investment(1) |  | Allowance
Commercial and industrial | ​ | — | ​ | $ | — | ​ | $ | — | ​ | 4 | ​ | $ | 906 | ​ | $ | 41
Residential mortgage | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | 1 | ​ | ​ | 351 | ​ | ​ | 14
Total | ​ | — | ​ | $ | — | ​ | $ | — | ​ | 5 | ​ | $ | 1,257 | ​ | $ | 55
(1) | The recorded investment balances reflect all partial paydowns and charge-offs since the modification date and do not include TDRs that have been fully paid off, charged off, or foreclosed upon by the end of the period.
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, 2018 | ​ | June 30, 2018
​ | ​ | Number of | ​ | Recorded | ​ | Related | ​ | Number of | ​ | Recorded | ​ | Related
(dollars in thousands) |  | Contracts |  | Investment(1) |  | Allowance |  | Contracts |  | Investment(1) |  | Allowance
Commercial and industrial | ​ | 1 | ​ | $ | 450 | ​ | $ | 13 | ​ | 1 | ​ | $ | 450 | ​ | $ | 13
Total | ​ | 1 | ​ | $ | 450 | ​ | $ | 13 | ​ | 1 | ​ | $ | 450 | ​ | $ | 13
(1) | The recorded investment balances reflect all partial paydowns and charge-offs since the modification date and do not include TDRs that have been fully paid off, charged off, or foreclosed upon by the end of the period.
Schedule of TDRs that defaulted in period within 12 months of their permanent modification date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, 2019 | ​ | June 30, 2019 | ​ | June 30, 2018 | ​ | June 30, 2018
​ | ​ | Number of | ​ | Recorded | ​ | Number of | ​ | Recorded | ​ | Number of | ​ | Recorded | ​ | Number of | ​ | Recorded
(dollars in thousands) |  | Contracts |  | Investment(1) |  | Contracts |  | Investment(1) |  | Contracts |  | Investment(1) |  | Contracts |  | Investment(1)
Commercial and industrial(2) | ​ | 4 | ​ | $ | 906 | ​ | 4 | ​ | $ | 906 | ​ | — | ​ | $ | — | ​ | 2 | ​ | $ | 409
Residential mortgage(3) | ​ | 1 | ​ | ​ | 351 | ​ | 1 | ​ | ​ | 351 | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | —
Total | ​ | 5 | ​ | $ | 1,257 | ​ | 5 | ​ | $ | 1,257 | ​ | — | ​ | $ | — | ​ | 2 | ​ | $ | 409
(1) | The recorded investment balances reflect all partial paydowns and charge-offs since the modification date and do not include TDRs that have been fully paid off, charged off, or foreclosed upon by the end of the period.
(2) | For the three and six months ended June 30, 2019, the commercial and industrial loans that subsequently defaulted were temporarily modified to interest-only payments. For the six months ended June 30, 2018, the maturity dates for the commercial and industrial loans that subsequently defaulted were extended.
(3) | For the three and six months ended June 30, 2019, the maturity date for the residential mortgage loan that subsequently defaulted was extended.

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