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Portfolio loans - Activity in the allowance for loan losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Activity in the allowance for loan losses            
Beginning balance $ 84,384 $ 50,915 $ 53,748 $ 50,648    
Provision for loan losses 12,891 2,517 30,107 4,628    
Charged-off (1,702) (2,941) (5,850) (5,410)    
Recoveries 473 884 1,208 1,509    
Ending balance 96,046 51,375 96,046 51,375    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         $ 2,208 $ 4,853
Loans collectively evaluated for impairment         93,838 48,895
Ending balance 84,384 51,375 53,748 51,375 96,046 53,748
Loans:            
Loans individually evaluated for impairment         22,106 34,031
Loans collectively evaluated for impairment         7,204,321 6,650,170
PCI loans evaluated for impairment         2,593 3,048
Ending balance         7,229,020 6,687,249
Commercial Loans            
Activity in the allowance for loan losses            
Beginning balance 22,725 17,998 18,291 17,829    
Provision for loan losses 2,473 1,161 8,146 2,954    
Charged-off (1,140) (2,563) (3,182) (4,370)    
Recoveries 88 137 176 320    
Ending balance 24,146 16,733 24,146 16,733    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         1,248 3,330
Loans collectively evaluated for impairment         22,898 14,961
Ending balance 24,146 16,733 18,291 17,829 24,146 18,291
Loans:            
Loans individually evaluated for impairment         6,263 9,740
Loans collectively evaluated for impairment         2,351,687 1,738,615
PCI loans evaluated for impairment         4 13
Ending balance         2,357,954 1,748,368
Commercial Real Estate Loans            
Activity in the allowance for loan losses            
Beginning balance 35,967 20,097 21,190 21,137    
Provision for loan losses 6,861 (97) 13,387 (1,186)    
Charged-off (165)   (1,264) (15)    
Recoveries 17 188 61 252    
Ending balance 42,680 20,188 42,680 20,188    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         486 1,049
Loans collectively evaluated for impairment         42,194 20,141
Ending balance 42,680 20,188 21,190 20,188 42,680 21,190
Loans:            
Loans individually evaluated for impairment         10,105 10,018
Loans collectively evaluated for impairment         2,834,987 2,781,495
PCI loans evaluated for impairment         1,922 1,904
Ending balance         2,847,014 2,793,417
Real Estate Construction            
Activity in the allowance for loan losses            
Beginning balance 7,193 2,807 3,204 2,723    
Provision for loan losses 574 411 1,463 413    
Recoveries 25 87 171 169    
Ending balance 7,792 3,305 7,792 3,305    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         7,792 3,204
Ending balance 7,792 3,305 3,204 3,305 7,792 3,204
Loans:            
Loans individually evaluated for impairment         559 539
Loans collectively evaluated for impairment         432,217 400,887
PCI loans evaluated for impairment         255 435
Ending balance         433,031 401,861
Retail Real Estate            
Activity in the allowance for loan losses            
Beginning balance 17,454 9,503 10,495 8,471    
Provision for loan losses 2,981 941 7,018 2,298    
Charged-off (292) (200) (1,000) (717)    
Recoveries 262 369 600 561    
Ending balance 20,405 10,613 20,405 10,613    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         474 474
Loans collectively evaluated for impairment         19,931 10,021
Ending balance 20,405 10,613 10,495 10,613 20,405 10,495
Loans:            
Loans individually evaluated for impairment         5,179 13,676
Loans collectively evaluated for impairment         1,542,624 1,679,397
PCI loans evaluated for impairment         412 696
Ending balance         1,548,215 1,693,769
Retail Other            
Activity in the allowance for loan losses            
Beginning balance 1,045 510 568 488    
Provision for loan losses 2 101 93 149    
Charged-off (105) (178) (404) (308)    
Recoveries 81 103 200 207    
Ending balance 1,023 536 1,023 536    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         1,023 568
Ending balance 1,023 $ 536 568 $ 536 1,023 568
Loans:            
Loans individually evaluated for impairment           58
Loans collectively evaluated for impairment         42,806 49,776
Ending balance         42,806 49,834
Post ASC 326            
Activity in the allowance for loan losses            
Ending balance 16,833   16,833      
Allowance for loan losses Ending balance attributed to:            
Ending balance 16,833   16,833   16,833  
Post ASC 326 | Commercial Loans            
Activity in the allowance for loan losses            
Ending balance 715   715      
Allowance for loan losses Ending balance attributed to:            
Ending balance 715   715   715  
Post ASC 326 | Commercial Real Estate Loans            
Activity in the allowance for loan losses            
Ending balance 9,306   9,306      
Allowance for loan losses Ending balance attributed to:            
Ending balance 9,306   9,306   9,306  
Post ASC 326 | Real Estate Construction            
Activity in the allowance for loan losses            
Ending balance 2,954   2,954      
Allowance for loan losses Ending balance attributed to:            
Ending balance 2,954   2,954   2,954  
Post ASC 326 | Retail Real Estate            
Activity in the allowance for loan losses            
Ending balance 3,292   3,292      
Allowance for loan losses Ending balance attributed to:            
Ending balance 3,292   3,292   3,292  
Post ASC 326 | Retail Other            
Activity in the allowance for loan losses            
Ending balance 566   566      
Allowance for loan losses Ending balance attributed to:            
Ending balance $ 566   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