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
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment $ 643,743   $ 616,867      
Attributable to loans individually evaluated for impairment 23,283   21,546      
Total ALLL balance 667,996 $ 672,580 638,413 $ 623,064 $ 613,719 $ 597,843
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 66,987,156   65,903,783      
Individually evaluated for impairment 892,691   873,514      
Financing Receivable Evaluated For Impairment 67,955,569   66,879,677      
Commercial            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 459,367   440,566      
Attributable to loans individually evaluated for impairment 14,239   10,525      
Total ALLL balance 474,576 480,308 451,091 424,507 422,441 398,753
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 34,597,081   34,841,609      
Individually evaluated for impairment 441,499   415,624      
Financing Receivable Evaluated For Impairment 35,114,302   35,359,613      
Consumer            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 184,376   176,301      
Attributable to loans individually evaluated for impairment 9,044   11,021      
Total ALLL balance 193,420 $ 192,272 187,322 $ 198,557 $ 191,278 $ 199,090
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 32,390,075   31,062,174      
Individually evaluated for impairment 451,192   457,890      
Financing Receivable Evaluated For Impairment 32,841,267   31,520,064      
Purchased credit-impaired            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 970          
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 75,722   102,380      
Purchased credit-impaired | Commercial            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 970          
Portion of loan and lease ending balance:            
Collectively evaluated for impairment 75,722   102,380      
Purchased credit-impaired | Consumer            
Portion of ALLL balance:            
Attributable to loans collectively evaluated for impairment 0          
Portion of loan and lease ending balance:            
Collectively evaluated for impairment $ 0   $ 0