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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
class
Sep. 30, 2017
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 140,601 $ 136,883 $ 137,253 $ 135,494
Charge-offs (6,128) (6,965) (19,552) (18,886)
Recoveries 2,317 2,909 7,119 7,319
Increase (decrease) in Provision 4,460 4,500 16,430 13,400
Balance at end of period 141,250 137,327 $ 141,250 137,327
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 35,239 33,341 $ 34,006 33,129
Charge-offs (303) (408) (778) (1,338)
Recoveries 51 582 154 825
Increase (decrease) in Provision (1,551) (1,677) 54 (778)
Balance at end of period 33,436 31,838 33,436 31,838
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 20,507 20,011 18,044 18,448
Recoveries 21 336 175 468
Increase (decrease) in Provision 286 234 2,595 1,665
Balance at end of period 20,814 20,581 20,814 20,581
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 7,606 5,471 6,817 4,513
Increase (decrease) in Provision (1,388) 353 (599) 1,311
Balance at end of period 6,218 5,824 6,218 5,824
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 557 857 611 847
Charge-offs   (1)   (147)
Increase (decrease) in Provision (29) (36) (83) 120
Balance at end of period 528 820 528 820
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 43,925 44,374 42,852 43,436
Charge-offs (125) (293) (159) (315)
Recoveries 442 139 684 610
Increase (decrease) in Provision 147 657 1,012 1,146
Balance at end of period 44,389 44,877 44,389 44,877
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 31,509 27,903 31,249 28,388
Charge-offs (5,700) (6,263) (18,615) (17,086)
Recoveries 1,803 1,852 6,106 5,416
Increase (decrease) in Provision 6,381 5,107 15,253 11,881
Balance at end of period 33,993 28,599 33,993 28,599
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 1,258 4,926 3,674 6,733
Increase (decrease) in Provision 614 (138) (1,802) (1,945)
Balance at end of period $ 1,872 $ 4,788 $ 1,872 $ 4,788