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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
class
Jun. 30, 2016
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 135,847 $ 137,154 $ 135,494 $ 135,484
Charge-offs (5,472) (4,803) (11,921) (9,167)
Recoveries 2,108 2,109 4,410 7,443
Increase (decrease) in Provision 4,400 1,900 8,900 2,600
Balance at end of period 136,883 136,360 $ 136,883 136,360
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 31,557 35,027 $ 33,129 34,025
Charge-offs (75) (52) (930) (138)
Recoveries 129 19 243 222
Increase (decrease) in Provision 1,730 798 899 1,683
Balance at end of period 33,341 35,792 33,341 35,792
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 19,932 18,504 18,448 18,489
Recoveries 55 47 132 3,246
Increase (decrease) in Provision 24 (291) 1,431 (3,475)
Balance at end of period 20,011 18,260 20,011 18,260
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 4,532 4,514 4,513 3,793
Increase (decrease) in Provision 939 122 958 843
Balance at end of period 5,471 4,636 5,471 4,636
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 813 807 847 888
Charge-offs (146)   (146)  
Recoveries   1   1
Increase (decrease) in Provision 190 (28) 156 (109)
Balance at end of period 857 780 857 780
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 43,541 45,638 43,436 46,099
Charge-offs   (456) (22) (528)
Recoveries 150 460 471 766
Increase (decrease) in Provision 683 810 489 115
Balance at end of period 44,374 46,452 44,374 46,452
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 27,456 27,923 28,388 28,385
Charge-offs (5,251) (4,295) (10,823) (8,501)
Recoveries 1,774 1,582 3,564 3,208
Increase (decrease) in Provision 3,924 3,176 6,774 5,294
Balance at end of period 27,903 28,386 27,903 28,386
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 8,016 4,741 6,733 3,805
Increase (decrease) in Provision (3,090) (2,687) (1,807) (1,751)
Balance at end of period $ 4,926 $ 2,054 $ 4,926 $ 2,054