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Portfolio loans - Allowance for Loan Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Changes in allowance for loan losses            
Beginning balance $ 51,375 $ 53,305 $ 50,648 $ 53,582    
Provision for loan loss 3,411 758 8,039 4,024    
Charged-off (2,499) (2,187) (7,909) (7,670)    
Recoveries 678 867 2,187 2,807    
Ending balance 52,965 52,743 52,965 52,743    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         $ 5,642 $ 5,561
Loans collectively evaluated for impairment         47,323 45,087
Ending balance 52,965 53,305 52,965 52,743 52,965 50,648
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         40,689 47,404
Loans collectively evaluated for impairment         6,624,916 5,518,246
PCI loans evaluated for impairment         3,810 2,778
Ending balance         6,669,415 5,568,428
Commercial            
Changes in allowance for loan losses            
Beginning balance 16,733 17,586 17,829 14,779    
Provision for loan loss 463 2,388 3,417 7,111    
Charged-off (817) (1,144) (5,187) (3,841)    
Recoveries 147 136 467 917    
Ending balance 16,526 18,966 16,526 18,966    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         2,671 4,319
Loans collectively evaluated for impairment         13,855 13,510
Ending balance 16,733 17,586 17,829 14,779 16,526 17,829
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         12,481 18,441
Loans collectively evaluated for impairment         1,667,992 1,386,247
PCI loans evaluated for impairment         18 418
Ending balance         1,680,491 1,405,106
Commercial real estate            
Changes in allowance for loan losses            
Beginning balance 20,188 23,047 21,137 21,813    
Provision for loan loss 3,167 (1,291) 1,981 1,154    
Charged-off (1,168) (62) (1,183) (1,487)    
Recoveries 33 58 285 272    
Ending balance 22,220 21,752 22,220 21,752    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         2,497 1,181
Loans collectively evaluated for impairment         19,723 19,956
Ending balance 20,188 23,047 21,137 21,752 22,220 21,137
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         14,954 15,318
Loans collectively evaluated for impairment         2,775,991 2,349,243
PCI loans evaluated for impairment         2,435 2,262
Ending balance         2,793,380 2,366,823
Real estate construction            
Changes in allowance for loan losses            
Beginning balance 3,305 2,915 2,723 2,861    
Provision for loan loss (359) (15) 54 22    
Charged-off       (97)    
Recoveries 164 32 333 146    
Ending balance 3,110 2,932 3,110 2,932    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         3,110 2,723
Ending balance 3,305 2,915 3,110 2,861 3,110 2,723
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         494 453
Loans collectively evaluated for impairment         425,630 287,744
PCI loans evaluated for impairment         435  
Ending balance         426,559 288,197
Retail real estate            
Changes in allowance for loan losses            
Beginning balance 10,613 9,293 8,471 13,783    
Provision for loan loss (86) (399) 2,212 (4,609)    
Charged-off (226) (695) (943) (1,637)    
Recoveries 221 423 782 1,085    
Ending balance 10,522 8,622 10,522 8,622    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         474 61
Loans collectively evaluated for impairment         10,048 8,410
Ending balance 10,613 9,293 10,522 13,783 10,522 8,471
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         12,693 13,159
Loans collectively evaluated for impairment         1,703,940 1,466,876
PCI loans evaluated for impairment         922 98
Ending balance         1,717,555 1,480,133
Retail other            
Changes in allowance for loan losses            
Beginning balance 536 464 488 346    
Provision for loan loss 226 75 375 346    
Charged-off (288) (286) (596) (608)    
Recoveries 113 218 320 387    
Ending balance 587 471 587 471    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         587 488
Ending balance $ 536 $ 464 $ 587 $ 346 587 488
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         67 33
Loans collectively evaluated for impairment         51,363 28,136
Ending balance         $ 51,430 $ 28,169