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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
class
Jun. 30, 2017
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 138,574 $ 135,847 $ 137,253 $ 135,494
Charge-offs (6,324) (5,472) (13,424) (11,921)
Recoveries 2,331 2,108 4,802 4,410
Increase (decrease) in Provision 6,020 4,400 11,970 8,900
Balance at end of period 140,601 136,883 $ 140,601 136,883
Commercial Lending        
Allowance for loan and lease losses        
Number of distinct portfolios | class     4  
Commercial and Industrial        
Activity in allowance for loan losses        
Balance at beginning of period 34,365 31,557 $ 34,006 33,129
Charge-offs   (75) (475) (930)
Recoveries 39 129 103 243
Increase (decrease) in Provision 835 1,730 1,605 899
Balance at end of period 35,239 33,341 35,239 33,341
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 19,254 19,932 18,044 18,448
Recoveries 32 55 154 132
Increase (decrease) in Provision 1,221 24 2,309 1,431
Balance at end of period 20,507 20,011 20,507 20,011
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 5,976 4,532 6,817 4,513
Increase (decrease) in Provision 1,630 939 789 958
Balance at end of period 7,606 5,471 7,606 5,471
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 585 813 611 847
Charge-offs   (146)   (146)
Increase (decrease) in Provision (28) 190 (54) 156
Balance at end of period 557 857 557 857
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  
Activity in allowance for loan losses        
Balance at beginning of period 43,220 43,541 42,852 43,436
Charge-offs (34)   (34) (22)
Recoveries 60 150 242 471
Increase (decrease) in Provision 679 683 865 489
Balance at end of period 43,925 44,374 43,925 44,374
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 30,998 27,456 31,249 28,388
Charge-offs (6,290) (5,251) (12,915) (10,823)
Recoveries 2,200 1,774 4,303 3,564
Increase (decrease) in Provision 4,601 3,924 8,872 6,774
Balance at end of period 31,509 27,903 31,509 27,903
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 4,176 8,016 3,674 6,733
Increase (decrease) in Provision (2,918) (3,090) (2,416) (1,807)
Balance at end of period $ 1,258 $ 4,926 $ 1,258 $ 4,926