Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment $ 638,774   $ 616,867      
Attributable to loans individually evaluated for impairment 36,712   21,546      
Total ALLL balance 675,486 $ 667,996 638,413 $ 616,898 $ 623,064 $ 597,843
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 67,234,966   65,903,783      
Individually evaluated for impairment 1,188,148   873,514      
Financing Receivable Evaluated For Impairment 68,488,103   66,879,677      
Commercial            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 451,284   440,566      
Attributable to loans individually evaluated for impairment 22,838   10,525      
Total ALLL balance 474,122 474,576 451,091 431,795 424,507 398,753
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 34,044,110   34,841,609      
Individually evaluated for impairment 566,340   415,624      
Financing Receivable Evaluated For Impairment 34,675,439   35,359,613      
Consumer            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 187,490   176,301      
Attributable to loans individually evaluated for impairment 13,874   11,021      
Total ALLL balance 201,364 $ 193,420 187,322 $ 185,103 $ 198,557 $ 199,090
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 33,190,856   31,062,174      
Individually evaluated for impairment 621,808   457,890      
Financing Receivable Evaluated For Impairment 33,812,664   31,520,064      
Purchased credit-impaired            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 0   0      
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 64,989   102,380      
Purchased credit-impaired | Commercial            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 0   0      
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 64,989   102,380      
Purchased credit-impaired | Consumer            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 0   0      
Portion of loan and lease ending balance:            
Collectively evaluated for impairment $ 0   $ 0