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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
class
Jun. 30, 2015
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 137,154 $ 135,698 $ 135,484 $ 134,799
Charge-offs (4,803) (4,993) (9,167) (8,991)
Recoveries 2,109 3,383 7,443 5,680
Increase (decrease) in Provision 1,900 2,250 2,600 4,850
Balance at end of period 136,360 136,338 $ 136,360 136,338
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 35,027 32,228 $ 34,025 31,835
Charge-offs (52) (304) (138) (304)
Recoveries 19 535 222 706
Increase (decrease) in Provision 798 455 1,683 677
Balance at end of period 35,792 32,914 35,792 32,914
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 18,504 16,508 18,489 16,320
Recoveries 47 52 3,246 240
Increase (decrease) in Provision (291) (862) (3,475) (862)
Balance at end of period 18,260 15,698 18,260 15,698
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 4,514 3,654 3,793 4,725
Increase (decrease) in Provision 122 (28) 843 (1,099)
Balance at end of period 4,636 3,626 4,636 3,626
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 807 1,010 888 1,089
Recoveries 1 1 1 1
Increase (decrease) in Provision (28) (3) (109) (82)
Balance at end of period 780 1,008 780 1,008
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 45,638 45,271 46,099 44,858
Charge-offs (456) (4) (528) (77)
Recoveries 460 1,070 766 1,490
Increase (decrease) in Provision 810 (651) 115 (585)
Balance at end of period 46,452 45,686 46,452 45,686
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 27,923 26,632 28,385 27,041
Charge-offs (4,295) (4,685) (8,501) (8,610)
Recoveries 1,582 1,725 3,208 3,243
Increase (decrease) in Provision 3,176 3,168 5,294 5,166
Balance at end of period 28,386 26,840 28,386 26,840
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 4,741 10,395 3,805 8,931
Increase (decrease) in Provision (2,687) 171 (1,751) 1,635
Balance at end of period $ 2,054 $ 10,566 $ 2,054 $ 10,566