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Allowance for loan losses - Troubled debt restructuring according to their accruing status (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 100,027   $ 119,339
Commercial      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 31,698   46,626
Construction      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 90   0
Mortgages      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 43,550   47,515
Leasing      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 234   362
Consumer      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 24,455   $ 24,836
Non Covered Loans      
Troubled Debt Restructuring      
Troubled debt restructurings 1,557,936 $ 1,515,889  
Non Covered Loans | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 94,593 112,999  
Non Covered Loans | Commercial      
Troubled Debt Restructuring      
Troubled debt restructurings 342,594 360,679  
Non Covered Loans | Commercial | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 27,651 46,889  
Non Covered Loans | Construction      
Troubled Debt Restructuring      
Troubled debt restructurings 1,788 1,788  
Non Covered Loans | Construction | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 90 56  
Non Covered Loans | Mortgages      
Troubled Debt Restructuring      
Troubled debt restructurings 1,106,656 1,042,470  
Non Covered Loans | Mortgages | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 42,666 41,211  
Non Covered Loans | Leasing      
Troubled Debt Restructuring      
Troubled debt restructurings 847 1,108  
Non Covered Loans | Leasing | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 234 320  
Non Covered Loans | Consumer      
Troubled Debt Restructuring      
Troubled debt restructurings 106,051 109,844  
Non Covered Loans | Consumer | TDR      
Troubled Debt Restructuring      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 23,952 24,523  
Non-Accruing | Non Covered Loans      
Troubled Debt Restructuring      
Troubled debt restructurings 267,466 284,558  
Non-Accruing | Non Covered Loans | Commercial      
Troubled Debt Restructuring      
Troubled debt restructurings 112,170 130,921  
Non-Accruing | Non Covered Loans | Construction      
Troubled Debt Restructuring      
Troubled debt restructurings 1,788 1,788  
Non-Accruing | Non Covered Loans | Mortgages      
Troubled Debt Restructuring      
Troubled debt restructurings 136,572 135,758  
Non-Accruing | Non Covered Loans | Leasing      
Troubled Debt Restructuring      
Troubled debt restructurings 315 440  
Non-Accruing | Non Covered Loans | Consumer      
Troubled Debt Restructuring      
Troubled debt restructurings 16,621 15,651  
Accruing | Non Covered Loans      
Troubled Debt Restructuring      
Troubled debt restructurings 1,290,470 1,231,331  
Accruing | Non Covered Loans | Commercial      
Troubled Debt Restructuring      
Troubled debt restructurings 230,424 229,758  
Accruing | Non Covered Loans | Construction      
Troubled Debt Restructuring      
Troubled debt restructurings 0 0  
Accruing | Non Covered Loans | Mortgages      
Troubled Debt Restructuring      
Troubled debt restructurings 970,084 906,712  
Accruing | Non Covered Loans | Leasing      
Troubled Debt Restructuring      
Troubled debt restructurings 532 668  
Accruing | Non Covered Loans | Consumer      
Troubled Debt Restructuring      
Troubled debt restructurings $ 89,430 $ 94,193