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Portfolio loans - Narrative (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
contract
Mar. 31, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Portfolio Loans      
Net deferred loan origination costs $ 5,400,000   $ 5,600,000
Amount of loan reduction due to net accretable purchase accounting adjustments 28,200,000   $ 13,900,000
Gross interest income that would have been recorded if impaired loans had been current $ 700,000 $ 400,000  
Loans newly classified as troubled debt restructurings (“TDR”)   $ 0  
TDRs subsequently classified as non-performing and had payment defaults 0 0  
Minimum days past due for TDR loans to be classified as non-performing 90 days    
Balance of all acquired loans $ 2,000,000,000    
Retail real estate      
Portfolio Loans      
Loans in the process of foreclosure 3,400,000    
Maximum | Commercial real estate      
Portfolio Loans      
Limit where loans are processed through an expedited underwriting process 1,000,000    
Pass and watch | Commercial      
Portfolio Loans      
Limit where loans are processed through an expedited underwriting process 350,000    
Pass and watch | Minimum | Commercial      
Portfolio Loans      
Limit where loans are processed through an expedited underwriting process 350,000    
Pass and watch | Maximum | Commercial      
Portfolio Loans      
Limit where loans are processed through an expedited underwriting process 1,000,000    
Watch | Commercial      
Portfolio Loans      
Limit above which loans are annually reviewed 1,000,000    
Special Mention      
Portfolio Loans      
Limit above which loans are annually reviewed 350,000    
In compliance with modified terms      
Portfolio Loans      
Loans newly classified as troubled debt restructurings (“TDR”) $ 3,100,000    
In compliance with modified terms | Commercial      
Portfolio Loans      
Performing loans classified as TDRs | loan   1