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Allowance for Loan and Lease Losses (Tables) | 9 Months Ended
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Sep. 30, 2019
Allowance for Loan and Lease Losses |
Schedule of components of allowance for loan and lease losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 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 | ​ | $ | 31,688 | ​ | $ | 22,204 | ​ | $ | 5,014 | ​ | $ | 446 | ​ | $ | 43,420 | ​ | $ | 33,638 | ​ | $ | 2,125 | ​ | $ | 138,535
Charge-offs | ​ | ​ | (514) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7) | ​ | ​ | (8,015) | ​ | ​ | — | ​ | ​ | (8,536)
Recoveries | ​ | ​ | 241 | ​ | ​ | 30 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 425 | ​ | ​ | 2,269 | ​ | ​ | — | ​ | ​ | 2,965
Increase (decrease) in Provision | ​ | ​ | (4,098) | ​ | ​ | (358) | ​ | ​ | (361) | ​ | ​ | (54) | ​ | ​ | 241 | ​ | ​ | 5,838 | ​ | ​ | (1,208) | ​ | ​ | —
Balance at end of period | ​ | $ | 27,317 | ​ | $ | 21,876 | ​ | $ | 4,653 | ​ | $ | 392 | ​ | $ | 44,079 | ​ | $ | 33,730 | ​ | $ | 917 | ​ | $ | 132,964
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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 | ​ | ​ | (2,514) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | (7) | ​ | ​ | (24,118) | ​ | ​ | — | ​ | ​ | (26,663)
Recoveries | ​ | ​ | 303 | ​ | ​ | 93 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 860 | ​ | ​ | 7,103 | ​ | ​ | — | ​ | ​ | 8,359
Increase (decrease) in Provision | ​ | ​ | (4,973) | ​ | ​ | 2,058 | ​ | ​ | (1,160) | ​ | ​ | (16) | ​ | ​ | (1,680) | ​ | ​ | 14,932 | ​ | ​ | 389 | ​ | ​ | 9,550
Balance at end of period | ​ | $ | 27,317 | ​ | $ | 21,876 | ​ | $ | 4,653 | ​ | $ | 392 | ​ | $ | 44,079 | ​ | $ | 33,730 | ​ | $ | 917 | ​ | $ | 132,964
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 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 | ​ | $ | 35,239 | ​ | $ | 20,507 | ​ | $ | 7,606 | ​ | $ | 557 | ​ | $ | 43,925 | ​ | $ | 31,509 | ​ | $ | 1,258 | ​ | $ | 140,601
Charge-offs | ​ | ​ | (303) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (125) | ​ | ​ | (5,700) | ​ | ​ | — | ​ | ​ | (6,128)
Recoveries | ​ | ​ | 51 | ​ | ​ | 21 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 442 | ​ | ​ | 1,803 | ​ | ​ | — | ​ | ​ | 2,317
Increase (decrease) in Provision | ​ | ​ | (1,551) | ​ | ​ | 286 | ​ | ​ | (1,388) | ​ | ​ | (29) | ​ | ​ | 147 | ​ | ​ | 6,381 | ​ | ​ | 614 | ​ | ​ | 4,460
Balance at end of period | ​ | $ | 33,436 | ​ | $ | 20,814 | ​ | $ | 6,218 | ​ | $ | 528 | ​ | $ | 44,389 | ​ | $ | 33,993 | ​ | $ | 1,872 | ​ | $ | 141,250
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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 | ​ | ​ | (778) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (159) | ​ | ​ | (18,615) | ​ | ​ | — | ​ | ​ | (19,552)
Recoveries | ​ | ​ | 154 | ​ | ​ | 175 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 684 | ​ | ​ | 6,106 | ​ | ​ | — | ​ | ​ | 7,119
Increase (decrease) in Provision | ​ | ​ | 54 | ​ | ​ | 2,595 | ​ | ​ | (599) | ​ | ​ | (83) | ​ | ​ | 1,012 | ​ | ​ | 15,253 | ​ | ​ | (1,802) | ​ | ​ | 16,430
Balance at end of period | ​ | $ | 33,436 | ​ | $ | 20,814 | ​ | $ | 6,218 | ​ | $ | 528 | ​ | $ | 44,389 | ​ | $ | 33,993 | ​ | $ | 1,872 | ​ | $ | 141,250
​
Schedule of disaggregation of Allowance and recorded investment in loans by impairment methodology | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 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 | ​ | $ | 106 | ​ | $ | 25 | ​ | $ | — | ​ | $ | — | ​ | $ | 284 | ​ | $ | — | ​ | $ | — | ​ | $ | 415
Collectively evaluated for impairment | ​ | ​ | 27,211 | ​ | ​ | 21,851 | ​ | ​ | 4,653 | ​ | ​ | 392 | ​ | ​ | 43,795 | ​ | ​ | 33,730 | ​ | ​ | 917 | ​ | ​ | 132,549
Balance at end of period | ​ | $ | 27,317 | ​ | $ | 21,876 | ​ | $ | 4,653 | ​ | $ | 392 | ​ | $ | 44,079 | ​ | $ | 33,730 | ​ | $ | 917 | ​ | $ | 132,964
Loans and leases: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Individually evaluated for impairment | ​ | $ | 8,239 | ​ | $ | 3,577 | ​ | $ | — | ​ | $ | — | ​ | $ | 14,539 | ​ | $ | 200 | ​ | $ | — | ​ | $ | 26,555
Collectively evaluated for impairment | ​ | ​ | 2,645,838 | ​ | ​ | 3,305,812 | ​ | ​ | 486,977 | ​ | ​ | 167,874 | ​ | ​ | 4,572,991 | ​ | ​ | 1,637,349 | ​ | ​ | — | ​ | ​ | 12,816,841
Balance at end of period | ​ | $ | 2,654,077 | ​ | $ | 3,309,389 | ​ | $ | 486,977 | ​ | $ | 167,874 | ​ | $ | 4,587,530 | ​ | $ | 1,637,549 | ​ | $ | — | ​ | $ | 12,843,396
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019
​ | ​ | Commercial | ​ | Commercial | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | and | ​ | Real | ​ | ​ | ​ | Lease | ​ | ​ | ​
(dollars in thousands) |  | Industrial |  | Estate |  | Construction |  | Financing |  | Total
Grade: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pass | ​ | $ | 2,498,746 | ​ | $ | 3,139,428 | ​ | $ | 483,535 | ​ | $ | 166,880 | ​ | $ | 6,288,589
Special mention | ​ | ​ | 119,553 | ​ | ​ | 125,082 | ​ | ​ | 308 | ​ | ​ | 878 | ​ | ​ | 245,821
Substandard | ​ | ​ | 35,778 | ​ | ​ | 44,879 | ​ | ​ | 3,134 | ​ | ​ | 116 | ​ | ​ | 83,907
Total | ​ | $ | 2,654,077 | ​ | $ | 3,309,389 | ​ | $ | 486,977 | ​ | $ | 167,874 | ​ | $ | 6,618,317
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019
(dollars in thousands) |  | Residential Mortgage |  | Home Equity Line |  | Consumer |  | Consumer - Auto |  | Credit Cards |  | Total
Performing | ​ | $ | 3,663,274 | ​ | $ | 910,032 | ​ | $ | 230,849 | ​ | $ | 1,029,124 | ​ | $ | 343,814 | ​ | $ | 6,177,093
Non-performing and delinquent | ​ | ​ | 8,150 | ​ | ​ | 6,074 | ​ | ​ | 6,032 | ​ | ​ | 22,242 | ​ | ​ | 5,488 | ​ | ​ | 47,986
Total | ​ | $ | 3,671,424 | ​ | $ | 916,106 | ​ | $ | 236,881 | ​ | $ | 1,051,366 | ​ | $ | 349,302 | ​ | $ | 6,225,079
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 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 | ​ | $ | 1,426 | ​ | $ | 1,204 | ​ | $ | 750 | ​ | $ | 3,380 | ​ | $ | 2,650,685 | ​ | $ | 2,654,065 | ​ | $ | 12 | ​ | $ | 2,654,077
Commercial real estate | ​ | ​ | 699 | ​ | ​ | 80 | ​ | ​ | — | ​ | ​ | 779 | ​ | ​ | 3,308,577 | ​ | ​ | 3,309,356 | ​ | ​ | 33 | ​ | ​ | 3,309,389
Construction | ​ | ​ | — | ​ | ​ | 3,169 | ​ | ​ | — | ​ | ​ | 3,169 | ​ | ​ | 483,808 | ​ | ​ | 486,977 | ​ | ​ | — | ​ | ​ | 486,977
Lease financing | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 167,874 | ​ | ​ | 167,874 | ​ | ​ | — | ​ | ​ | 167,874
Residential mortgage | ​ | ​ | 2,499 | ​ | ​ | 1,553 | ​ | ​ | 139 | ​ | ​ | 4,191 | ​ | ​ | 3,663,274 | ​ | ​ | 3,667,465 | ​ | ​ | 3,959 | ​ | ​ | 3,671,424
Home equity line | ​ | ​ | 1,933 | ​ | ​ | 949 | ​ | ​ | 3,192 | ​ | ​ | 6,074 | ​ | ​ | 910,032 | ​ | ​ | 916,106 | ​ | ​ | — | ​ | ​ | 916,106
Consumer | ​ | ​ | 24,375 | ​ | ​ | 6,111 | ​ | ​ | 3,076 | ​ | ​ | 33,562 | ​ | ​ | 1,603,787 | ​ | ​ | 1,637,349 | ​ | ​ | 200 | ​ | ​ | 1,637,549
Total | ​ | $ | 30,932 | ​ | $ | 13,066 | ​ | $ | 7,157 | ​ | $ | 51,155 | ​ | $ | 12,788,037 | ​ | $ | 12,839,192 | ​ | $ | 4,204 | ​ | $ | 12,843,396
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019
​ | ​ | ​ | ​ | Unpaid | ​ | ​
​ | ​ | Recorded | ​ | Principal | ​ | Related
(dollars in thousands) |  | Investment |  | Balance |  | Allowance
Impaired loans with no related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 2,498 | ​ | $ | 2,510 | ​ | $ | —
Commercial real estate | ​ | ​ | 2,876 | ​ | ​ | 2,876 | ​ | ​ | —
Residential mortgage | ​ | ​ | 8,454 | ​ | ​ | 8,519 | ​ | ​ | —
Consumer | ​ | ​ | 200 | ​ | ​ | 632 | ​ | ​ | —
Total | ​ | $ | 14,028 | ​ | $ | 14,537 | ​ | $ | —
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 5,741 | ​ | $ | 5,741 | ​ | $ | 106
Commercial real estate | ​ | ​ | 701 | ​ | ​ | 701 | ​ | ​ | 25
Residential mortgage | ​ | ​ | 6,085 | ​ | ​ | 6,471 | ​ | ​ | 284
Total | ​ | $ | 12,527 | ​ | $ | 12,913 | ​ | $ | 415
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 8,239 | ​ | $ | 8,251 | ​ | $ | 106
Commercial real estate | ​ | ​ | 3,577 | ​ | ​ | 3,577 | ​ | ​ | 25
Residential mortgage | ​ | ​ | 14,539 | ​ | ​ | 14,990 | ​ | ​ | 284
Consumer | ​ | ​ | 200 | ​ | ​ | 632 | ​ | ​ | —
Total | ​ | $ | 26,555 | ​ | $ | 27,450 | ​ | $ | 415
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | Nine Months Ended
​ | ​ | September 30, 2019 | ​ | September 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 | ​ | $ | 3,888 | ​ | $ | 38 | ​ | $ | 3,653 | ​ | $ | 123
Commercial real estate | ​ | ​ | 2,946 | ​ | ​ | 38 | ​ | ​ | 3,524 | ​ | ​ | 250
Residential mortgage | ​ | ​ | 8,065 | ​ | ​ | 88 | ​ | ​ | 8,365 | ​ | ​ | 280
Consumer | ​ | ​ | 100 | ​ | ​ | — | ​ | ​ | 50 | ​ | ​ | —
Total | ​ | $ | 14,999 | ​ | $ | 164 | ​ | $ | 15,592 | ​ | $ | 653
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 4,673 | ​ | $ | 94 | ​ | $ | 5,325 | ​ | $ | 301
Commercial real estate | ​ | ​ | 706 | ​ | ​ | 10 | ​ | ​ | 714 | ​ | ​ | 30
Residential mortgage | ​ | ​ | 6,608 | ​ | ​ | 98 | ​ | ​ | 6,882 | ​ | ​ | 297
Total | ​ | $ | 11,987 | ​ | $ | 202 | ​ | $ | 12,921 | ​ | $ | 628
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 8,561 | ​ | $ | 132 | ​ | $ | 8,978 | ​ | $ | 424
Commercial real estate | ​ | ​ | 3,652 | ​ | ​ | 48 | ​ | ​ | 4,238 | ​ | ​ | 280
Residential mortgage | ​ | ​ | 14,673 | ​ | ​ | 186 | ​ | ​ | 15,247 | ​ | ​ | 577
Consumer | ​ | ​ | 100 | ​ | ​ | — | ​ | ​ | 50 | ​ | ​ | —
Total | ​ | $ | 26,986 | ​ | $ | 366 | ​ | $ | 28,513 | ​ | $ | 1,281
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, 2018 | ​ | September 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 | ​ | $ | 8,830 | ​ | $ | 38 | ​ | $ | 13,149 | ​ | $ | 141
Commercial real estate | ​ | ​ | 7,671 | ​ | ​ | 47 | ​ | ​ | 8,587 | ​ | ​ | 116
Construction | ​ | ​ | 2,120 | ​ | ​ | 12 | ​ | ​ | 1,560 | ​ | ​ | 12
Residential mortgage | ​ | ​ | 10,069 | ​ | ​ | 132 | ​ | ​ | 9,416 | ​ | ​ | 399
Total | ​ | $ | 28,690 | ​ | $ | 229 | ​ | $ | 32,712 | ​ | $ | 668
Impaired loans with a related allowance recorded: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 5,605 | ​ | $ | 136 | ​ | $ | 2,875 | ​ | $ | 402
Commercial real estate | ​ | ​ | 1,106 | ​ | ​ | 17 | ​ | ​ | 996 | ​ | ​ | 51
Residential mortgage | ​ | ​ | 7,238 | ​ | ​ | 77 | ​ | ​ | 7,461 | ​ | ​ | 248
Total | ​ | $ | 13,949 | ​ | $ | 230 | ​ | $ | 11,332 | ​ | $ | 701
Total impaired loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial and industrial | ​ | $ | 14,435 | ​ | $ | 174 | ​ | $ | 16,024 | ​ | $ | 543
Commercial real estate | ​ | ​ | 8,777 | ​ | ​ | 64 | ​ | ​ | 9,583 | ​ | ​ | 167
Construction | ​ | ​ | 2,120 | ​ | ​ | 12 | ​ | ​ | 1,560 | ​ | ​ | 12
Residential mortgage | ​ | ​ | 17,307 | ​ | ​ | 209 | ​ | ​ | 16,877 | ​ | ​ | 647
Total | ​ | $ | 42,639 | ​ | $ | 459 | ​ | $ | 44,044 | ​ | $ | 1,369
Schedule of information related to loans modified in a TDR | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, 2019 | ​ | September 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 | ​ | $ | 588 | ​ | $ | 26
Residential mortgage | ​ | 1 | ​ | ​ | 609 | ​ | ​ | — | ​ | 2 | ​ | ​ | 957 | ​ | ​ | 13
Total | ​ | 1 | ​ | $ | 609 | ​ | $ | — | ​ | 6 | ​ | $ | 1,545 | ​ | $ | 39
(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 | ​ | Nine Months Ended
​ | ​ | September 30, 2018 | ​ | September 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 | ​ | $ | 12
Residential mortgage | ​ | 3 | ​ | ​ | 883 | ​ | ​ | 30 | ​ | 3 | ​ | ​ | 883 | ​ | ​ | 30
Total | ​ | 3 | ​ | $ | 883 | ​ | $ | 30 | ​ | 4 | ​ | $ | 1,333 | ​ | $ | 42
(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 | ​ | Nine Months Ended | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, 2019 | ​ | September 30, 2019 | ​ | September 30, 2018 | ​ | September 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) | ​ | 2 | ​ | $ | 588 | ​ | 4 | ​ | $ | 588 | ​ | — | ​ | $ | — | ​ | 2 | ​ | $ | 254
Residential mortgage(3) | ​ | — | ​ | ​ | — | ​ | 1 | ​ | ​ | 348 | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | —
Total | ​ | 2 | ​ | $ | 588 | ​ | 5 | ​ | $ | 936 | ​ | — | ​ | $ | — | ​ | 2 | ​ | $ | 254
(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 nine months ended September 30, 2019, the commercial and industrial loans that subsequently defaulted were temporarily modified to interest-only payments. For the nine months ended September 30, 2018, the maturity dates for the commercial and industrial loans that subsequently defaulted were extended.
(3) | For the nine months ended September 30, 2019, the maturity date for the residential mortgage loan that subsequently defaulted was extended.

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