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Portfolio loans - Activity in the allowance for loan losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Activity in the allowance for loan losses            
Beginning balance $ 96,046 $ 51,375 $ 53,748 $ 50,648    
Provision for loan losses 5,549 3,411 35,656 8,039    
Charged-off (3,397) (2,499) (9,247) (7,909)    
Recoveries 643 678 1,851 2,187    
Ending balance 98,841 52,965 98,841 52,965    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         $ 2,404 $ 4,853
Loans collectively evaluated for impairment         96,437 48,895
Ending balance 96,046 52,965 53,748 52,965 98,841 53,748
Loans:            
Loans individually evaluated for impairment         19,137 34,031
Loans collectively evaluated for impairment         7,099,617 6,650,170
PCI loans evaluated for impairment         2,557 3,048
Ending balance         7,121,311 6,687,249
Commercial Loans            
Activity in the allowance for loan losses            
Beginning balance 24,146 16,733 18,291 17,829    
Provision for loan losses 2,593 463 10,739 3,417    
Charged-off (2,500) (817) (5,682) (5,187)    
Recoveries 124 147 300 467    
Ending balance 24,363 16,526 24,363 16,526    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         1,694 3,330
Loans collectively evaluated for impairment         22,669 14,961
Ending balance 24,363 16,526 18,291 17,829 24,363 18,291
Loans:            
Loans individually evaluated for impairment         7,759 9,740
Loans collectively evaluated for impairment         2,273,272 1,738,615
PCI loans evaluated for impairment           13
Ending balance         2,281,031 1,748,368
Commercial Real Estate Loans            
Activity in the allowance for loan losses            
Beginning balance 42,680 20,188 21,190 21,137    
Provision for loan losses 3,703 3,167 17,090 1,981    
Charged-off (569) (1,168) (1,833) (1,183)    
Recoveries 103 33 164 285    
Ending balance 45,917 22,220 45,917 22,220    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         236 1,049
Loans collectively evaluated for impairment         45,681 20,141
Ending balance 45,917 22,220 45,917 22,220 45,917 21,190
Loans:            
Loans individually evaluated for impairment         6,415 10,018
Loans collectively evaluated for impairment         2,904,077 2,781,495
PCI loans evaluated for impairment         1,916 1,904
Ending balance         2,912,408 2,793,417
Real Estate Construction            
Activity in the allowance for loan losses            
Beginning balance 7,792 3,305 3,204 2,723    
Provision for loan losses (381) (359) 1,082 54    
Charged-off (18)   (18)      
Recoveries 26 164 197 333    
Ending balance 7,419 3,110 7,419 3,110    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         7,419 3,204
Ending balance 7,419 3,110 3,204 2,723 7,419 3,204
Loans:            
Loans individually evaluated for impairment         297 539
Loans collectively evaluated for impairment         406,714 400,887
PCI loans evaluated for impairment         255 435
Ending balance         407,266 401,861
Retail Real Estate            
Activity in the allowance for loan losses            
Beginning balance 20,405 10,613 10,495 8,471    
Provision for loan losses (383) (86) 6,635 2,212    
Charged-off (139) (226) (1,139) (943)    
Recoveries 301 221 901 782    
Ending balance 20,184 10,522 20,184 10,522    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         474 474
Loans collectively evaluated for impairment         19,710 10,021
Ending balance 20,184 10,522 20,184 8,471 20,184 10,495
Loans:            
Loans individually evaluated for impairment         4,666 13,676
Loans collectively evaluated for impairment         1,475,468 1,679,397
PCI loans evaluated for impairment         386 696
Ending balance         1,480,520 1,693,769
Retail Other            
Activity in the allowance for loan losses            
Beginning balance 1,023 536 568 488    
Provision for loan losses 17 226 110 375    
Charged-off (171) (288) (575) (596)    
Recoveries 89 113 289 320    
Ending balance 958 587 958 587    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         958 568
Ending balance $ 958 $ 587 568 $ 587 958 568
Loans:            
Loans individually evaluated for impairment           58
Loans collectively evaluated for impairment         40,086 49,776
Ending balance         $ 40,086 49,834
Cumulative Effect, Period of Adoption, Adjustment            
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
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans            
Activity in the allowance for loan losses            
Beginning balance     715      
Allowance for loan losses Ending balance attributed to:            
Ending balance     715     715
Cumulative Effect, Period of Adoption, Adjustment | 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
Cumulative Effect, Period of Adoption, Adjustment | 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
Cumulative Effect, Period of Adoption, Adjustment | 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
Cumulative Effect, Period of Adoption, Adjustment | Retail Other            
Activity in the allowance for loan losses            
Beginning balance     566      
Allowance for loan losses Ending balance attributed to:            
Ending balance     $ 566     $ 566