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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
Commercial Lending            
Allowance for loan and lease losses            
Number of distinct portfolios | class     4   4  
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
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
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
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
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
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
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