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Note Allowance for loan losses (Troubled debt restructuring according to their accruing status) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 119,670 $ 109,091
Commercial    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 52,190 36,982
Construction    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 56 0
Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 41,211 48,832
Leasing    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 320 475
Consumer    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 25,893 22,802
Non Covered Loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,515,889 1,258,327
Non Covered Loans | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 112,999 104,581
Non Covered Loans | Commercial    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 360,679 220,846
Non Covered Loans | Commercial | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 46,889 32,472
Non Covered Loans | Construction    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,788 0
Non Covered Loans | Construction | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 56 0
Non Covered Loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,042,470 930,076
Non Covered Loans | Mortgages | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 41,211 48,832
Non Covered Loans | Leasing    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,108 1,256
Non Covered Loans | Leasing | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 320 475
Non Covered Loans | Consumer    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 109,844 106,149
Non Covered Loans | Consumer | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 24,523 22,802
Covered loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 5,885
Covered loans | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0
Covered loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 5,885
Covered loans | Mortgages | TDR    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0
Non-Accruing | Non Covered Loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 284,558 199,050
Non-Accruing | Non Covered Loans | Commercial    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 130,921 59,626
Non-Accruing | Non Covered Loans | Construction    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,788 0
Non-Accruing | Non Covered Loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 135,758 126,798
Non-Accruing | Non Covered Loans | Leasing    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 440 393
Non-Accruing | Non Covered Loans | Consumer    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 15,651 12,233
Non-Accruing | Covered loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 3,227
Non-Accruing | Covered loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 3,227
Accruing | Non Covered Loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 1,231,331 1,059,277
Accruing | Non Covered Loans | Commercial    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 229,758 161,220
Accruing | Non Covered Loans | Construction    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 0
Accruing | Non Covered Loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 906,712 803,278
Accruing | Non Covered Loans | Leasing    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 668 863
Accruing | Non Covered Loans | Consumer    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 94,193 93,916
Accruing | Covered loans    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings 0 2,658
Accruing | Covered loans | Mortgages    
Troubled Debt Restructuring, Debtor, Current Period [Line Items]    
Troubled debt restructurings $ 0 $ 2,658