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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
class
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
segment
class
Dec. 31, 2014
USD ($)
Allowance for loan and lease losses            
Number of primary portfolio segments | segment     3   3  
Activity in allowance for loan losses            
Balance at beginning of period $ 136,360 $ 136,338 $ 135,484 $ 134,799 $ 134,799 $ 133,239
Charge-offs (5,356) (5,816) (14,523) (14,807) (19,796) (18,675)
Recoveries 1,921 2,375 9,364 8,055 10,581 9,135
Increase (decrease) in Provision 2,100 2,550 4,700 7,400 9,900 11,100
Balance at end of period 135,025 135,447 135,025 135,447 135,484 134,799
Individually evaluated for impairment 559   559   592 1,363
Collectively evaluated for impairment 134,466   134,466   134,892 133,436
Loans and leases:            
Individually evaluated for impairment 60,383   60,383   44,147 59,219
Collectively evaluated for impairment 11,336,172   11,336,172   10,677,883 9,964,371
Total loans and leases 11,396,555   $ 11,396,555   $ 10,722,030 10,023,590
Commercial Lending            
Allowance for loan and lease losses            
Number of distinct portfolios | class     4   4  
Loans and leases:            
Total loans and leases 6,239,675   $ 6,239,675   $ 5,788,042 5,458,966
Commercial and Industrial            
Activity in allowance for loan losses            
Balance at beginning of period 35,792 32,914 34,025 31,835 31,835 34,026
Charge-offs (210) (461) (348) (765) (866) (2,298)
Recoveries 6 178 228 884 940 1,387
Increase (decrease) in Provision (1,428) 277 255 954 2,116 (1,280)
Balance at end of period 34,160 32,908 34,160 32,908 34,025 31,835
Individually evaluated for impairment 7   7     571
Collectively evaluated for impairment 34,153   34,153   34,025 31,264
Loans and leases:            
Individually evaluated for impairment 29,444   29,444   15,845 16,662
Collectively evaluated for impairment 3,235,847   3,235,847   3,041,610 2,680,480
Total loans and leases 3,265,291   3,265,291   3,057,455 2,697,142
Commercial Real Estate            
Activity in allowance for loan losses            
Balance at beginning of period 18,260 15,698 18,489 16,320 16,320 16,606
Recoveries 42 58 3,288 298 1,115 207
Increase (decrease) in Provision 221 2,618 (3,254) 1,756 1,054 (493)
Balance at end of period 18,523 18,374 18,523 18,374 18,489 16,320
Individually evaluated for impairment 7   7     52
Collectively evaluated for impairment 18,516   18,516   18,489 16,268
Loans and leases:            
Individually evaluated for impairment 13,302   13,302   5,787 6,403
Collectively evaluated for impairment 2,298,572   2,298,572   2,158,661 2,041,062
Total loans and leases 2,311,874   2,311,874   2,164,448 2,047,465
Construction            
Activity in allowance for loan losses            
Balance at beginning of period 4,636 3,626 3,793 4,725 4,725 4,702
Increase (decrease) in Provision 596 (380) 1,439 (1,479) (932) 23
Balance at end of period 5,232 3,246 5,232 3,246 3,793 4,725
Collectively evaluated for impairment 5,232   5,232   3,793 4,725
Loans and leases:            
Individually evaluated for impairment           4,579
Collectively evaluated for impairment 475,333   475,333   367,460 465,482
Total loans and leases 475,333   475,333   367,460 470,061
Lease Financing            
Activity in allowance for loan losses            
Balance at beginning of period 780 1,008 888 1,089 1,089 1,078
Recoveries   1 1 2 3 57
Increase (decrease) in Provision (55) (39) (164) (121) (204) (46)
Balance at end of period 725 970 725 970 888 1,089
Collectively evaluated for impairment 725   725   888 1,089
Loans and leases:            
Individually evaluated for impairment 163   163   181 187
Collectively evaluated for impairment 187,014   187,014   198,498 244,111
Total loans and leases 187,177   187,177   198,679 244,298
Residential            
Allowance for loan and lease losses            
Specific allocation for impaired loans in which the net collateral value exceeds the unpaid principal balance of the loan 0   0   0  
Activity in allowance for loan losses            
Balance at beginning of period 46,452 45,686 46,099 44,858 44,858 42,028
Charge-offs (268) (484) (796) (561) (618) (1,086)
Recoveries 350 608 1,116 2,098 2,198 1,470
Increase (decrease) in Provision (492) 17 (377) (568) (339) 2,446
Balance at end of period 46,042 45,827 46,042 45,827 46,099 44,858
Individually evaluated for impairment 545   545   592 740
Collectively evaluated for impairment 45,497   45,497   45,507 44,118
Loans and leases:            
Individually evaluated for impairment 17,474   17,474   22,334 31,388
Collectively evaluated for impairment 3,670,186   3,670,186   3,510,093 3,306,633
Total loans and leases 3,687,660   3,687,660   3,532,427 3,338,021
Consumer            
Activity in allowance for loan losses            
Balance at beginning of period 28,386 26,840 28,385 27,041 27,041 25,589
Charge-offs (4,878) (4,871) (13,379) (13,481) (18,312) (15,291)
Recoveries 1,523 1,530 4,731 4,773 6,325 6,014
Increase (decrease) in Provision 3,183 3,916 8,477 9,082 13,331 10,729
Balance at end of period 28,214 27,415 28,214 27,415 28,385 27,041
Collectively evaluated for impairment 28,214   28,214   28,385 27,041
Loans and leases:            
Collectively evaluated for impairment 1,469,220   1,469,220   1,401,561 1,226,603
Total loans and leases 1,469,220   1,469,220   1,401,561 1,226,603
Unallocated            
Activity in allowance for loan losses            
Balance at beginning of period 2,054 10,566 3,805 8,931 8,931 9,210
Increase (decrease) in Provision 75 (3,859) (1,676) (2,224) (5,126) (279)
Balance at end of period 2,129 $ 6,707 2,129 $ 6,707 3,805 8,931
Collectively evaluated for impairment $ 2,129   $ 2,129   $ 3,805 $ 8,931