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Portfolio loans - Activity in the allowance for loan losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Activity in the allowance for loan losses        
Beginning balance $ 53,748 $ 50,648    
Provision for loan losses 17,216 2,111    
Charged-off (4,148) (2,469)    
Recoveries 735 625    
Ending balance 84,384 50,915    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     $ 3,938 $ 4,853
Loans collectively evaluated for impairment     80,446 48,895
Ending balance 53,748 50,915 84,384 53,748
Loans:        
Loans individually evaluated for impairment     22,791 34,031
Loans collectively evaluated for impairment     6,720,127 6,650,170
PCI loans evaluated for impairment     2,581 3,048
Ending balance     6,745,499 6,687,249
Commercial Loans        
Activity in the allowance for loan losses        
Beginning balance 18,291 17,829    
Provision for loan losses 5,673 1,793    
Charged-off (2,042) (1,807)    
Recoveries 88 183    
Ending balance 22,725 17,998    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     2,822 3,330
Loans collectively evaluated for impairment     19,903 14,961
Ending balance 18,291 17,998 22,725 18,291
Loans:        
Loans individually evaluated for impairment     7,414 9,740
Loans collectively evaluated for impairment     1,759,769 1,738,615
PCI loans evaluated for impairment     8 13
Ending balance     1,767,191 1,748,368
Commercial Real Estate Loans        
Activity in the allowance for loan losses        
Beginning balance 21,190 21,137    
Provision for loan losses 6,526 (1,089)    
Charged-off (1,099) (15)    
Recoveries 44 64    
Ending balance 35,967 20,097    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     642 1,049
Loans collectively evaluated for impairment     35,325 20,141
Ending balance 21,190 20,097 35,967 21,190
Loans:        
Loans individually evaluated for impairment     8,452 10,018
Loans collectively evaluated for impairment     2,814,686 2,781,495
PCI loans evaluated for impairment     1,865 1,904
Ending balance     2,825,003 2,793,417
Real Estate Construction        
Activity in the allowance for loan losses        
Beginning balance 3,204 2,723    
Provision for loan losses 889 2    
Recoveries 146 82    
Ending balance 7,193 2,807    
Allowance for loan losses Ending balance attributed to:        
Loans collectively evaluated for impairment     7,193 3,204
Ending balance 3,204 2,807 7,193 3,204
Loans:        
Loans individually evaluated for impairment     307 539
Loans collectively evaluated for impairment     447,751 400,887
PCI loans evaluated for impairment     255 435
Ending balance     448,313 401,861
Retail Real Estate        
Activity in the allowance for loan losses        
Beginning balance 10,495 8,471    
Provision for loan losses 4,037 1,357    
Charged-off (708) (517)    
Recoveries 338 192    
Ending balance 17,454 9,503    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     474 474
Loans collectively evaluated for impairment     16,980 10,021
Ending balance 10,495 9,503 17,454 10,495
Loans:        
Loans individually evaluated for impairment     6,618 13,676
Loans collectively evaluated for impairment     1,649,557 1,679,397
PCI loans evaluated for impairment     453 696
Ending balance     1,656,628 1,693,769
Retail Other        
Activity in the allowance for loan losses        
Beginning balance 568 488    
Provision for loan losses 91 48    
Charged-off (299) (130)    
Recoveries 119 104    
Ending balance 1,045 510    
Allowance for loan losses Ending balance attributed to:        
Loans collectively evaluated for impairment     1,045 568
Ending balance 568 $ 510 1,045 568
Loans:        
Loans individually evaluated for impairment       58
Loans collectively evaluated for impairment     48,364 49,776
Ending balance     $ 48,364 49,834
Post ASC 326        
Activity in the allowance for loan losses        
Beginning balance 16,833      
Allowance for loan losses Ending balance attributed to:        
Ending balance 16,833     16,833
Post ASC 326 | Commercial Loans        
Activity in the allowance for loan losses        
Beginning balance 715      
Allowance for loan losses Ending balance attributed to:        
Ending balance 715     715
Post ASC 326 | Commercial Real Estate Loans        
Activity in the allowance for loan losses        
Beginning balance 9,306      
Allowance for loan losses Ending balance attributed to:        
Ending balance 9,306     9,306
Post ASC 326 | Real Estate Construction        
Activity in the allowance for loan losses        
Beginning balance 2,954      
Allowance for loan losses Ending balance attributed to:        
Ending balance 2,954     2,954
Post ASC 326 | Retail Real Estate        
Activity in the allowance for loan losses        
Beginning balance 3,292      
Allowance for loan losses Ending balance attributed to:        
Ending balance 3,292     3,292
Post ASC 326 | Retail Other        
Activity in the allowance for loan losses        
Beginning balance 566      
Allowance for loan losses Ending balance attributed to:        
Ending balance 566     566
Pre-ASC 326        
Activity in the allowance for loan losses        
Beginning balance 53,748      
Allowance for loan losses Ending balance attributed to:        
Ending balance 53,748     53,748
Pre-ASC 326 | Commercial Loans        
Activity in the allowance for loan losses        
Beginning balance 18,291      
Allowance for loan losses Ending balance attributed to:        
Ending balance 18,291     18,291
Pre-ASC 326 | Commercial Real Estate Loans        
Activity in the allowance for loan losses        
Beginning balance 21,190      
Allowance for loan losses Ending balance attributed to:        
Ending balance 21,190     21,190
Pre-ASC 326 | Real Estate Construction        
Activity in the allowance for loan losses        
Beginning balance 3,204      
Allowance for loan losses Ending balance attributed to:        
Ending balance 3,204     3,204
Pre-ASC 326 | Retail Real Estate        
Activity in the allowance for loan losses        
Beginning balance 10,495      
Allowance for loan losses Ending balance attributed to:        
Ending balance 10,495     10,495
Pre-ASC 326 | Retail Other        
Activity in the allowance for loan losses        
Beginning balance 568      
Allowance for loan losses Ending balance attributed to:        
Ending balance $ 568     $ 568