Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment $ 616,867 $ 532,678    
Attributable to loans individually evaluated for impairment 21,546 62,436    
Total ALLL balance: 638,413 597,843 $ 605,196 $ 647,870
Collectively evaluated for impairment 65,903,783 49,027,030    
Financing Receivable Evaluated For Impairment 66,879,677 50,341,099    
Individually evaluated for impairment 873,514 1,277,788    
Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment   2,729    
Collectively evaluated for impairment 102,380 36,281    
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 440,566 368,723    
Attributable to loans individually evaluated for impairment 10,525 27,428    
Total ALLL balance: 451,091 398,753 389,834 428,358
Collectively evaluated for impairment 34,841,609 25,167,700    
Financing Receivable Evaluated For Impairment 35,359,613 25,828,485    
Individually evaluated for impairment 415,624 626,010    
Commercial | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment   2,602    
Collectively evaluated for impairment 102,380 34,775    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 176,301 163,955    
Attributable to loans individually evaluated for impairment 11,021 35,008    
Total ALLL balance: 187,322 199,090 $ 215,362 $ 219,512
Collectively evaluated for impairment 31,062,174 23,859,330    
Financing Receivable Evaluated For Impairment 31,520,064 24,512,614    
Individually evaluated for impairment 457,890 651,778    
Consumer | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment   127    
Collectively evaluated for impairment $ 0 $ 1,506