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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
class
Sep. 30, 2016
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 136,883 $ 136,360 $ 135,494 $ 135,484
Charge-offs (6,965) (5,356) (18,886) (14,523)
Recoveries 2,909 1,921 7,319 9,364
Increase (decrease) in Provision 4,500 2,100 13,400 4,700
Balance at end of period 137,327 135,025 $ 137,327 135,025
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 33,341 35,792 $ 33,129 34,025
Charge-offs (408) (210) (1,338) (348)
Recoveries 582 6 825 228
Increase (decrease) in Provision (1,677) (1,428) (778) 255
Balance at end of period 31,838 34,160 31,838 34,160
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 20,011 18,260 18,448 18,489
Recoveries 336 42 468 3,288
Increase (decrease) in Provision 234 221 1,665 (3,254)
Balance at end of period 20,581 18,523 20,581 18,523
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 5,471 4,636 4,513 3,793
Increase (decrease) in Provision 353 596 1,311 1,439
Balance at end of period 5,824 5,232 5,824 5,232
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 857 780 847 888
Charge-offs (1)   (147)  
Recoveries       1
Increase (decrease) in Provision (36) (55) 120 (164)
Balance at end of period 820 725 820 725
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 44,374 46,452 43,436 46,099
Charge-offs (293) (268) (315) (796)
Recoveries 139 350 610 1,116
Increase (decrease) in Provision 657 (492) 1,146 (377)
Balance at end of period 44,877 46,042 44,877 46,042
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 27,903 28,386 28,388 28,385
Charge-offs (6,263) (4,878) (17,086) (13,379)
Recoveries 1,852 1,523 5,416 4,731
Increase (decrease) in Provision 5,107 3,183 11,881 8,477
Balance at end of period 28,599 28,214 28,599 28,214
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 4,926 2,054 6,733 3,805
Increase (decrease) in Provision (138) 75 (1,945) (1,676)
Balance at end of period $ 4,788 $ 2,129 $ 4,788 $ 2,129