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Portfolio loans - Allowance for Loan Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Changes in allowance for loan losses            
Beginning balance $ 50,915 $ 52,649 $ 50,648 $ 53,582    
Provision for loan loss 2,517 2,258 4,628 3,266    
Charged-off (2,941) (2,553) (5,410) (5,483)    
Recoveries 884 951 1,509 1,940    
Ending balance 51,375 53,305 51,375 53,305    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         $ 4,199 $ 5,561
Loans collectively evaluated for impairment         47,176 45,087
Ending balance 51,375 52,649 51,375 53,582 51,375 50,648
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         40,512 47,404
Loans collectively evaluated for impairment         6,487,514 5,518,246
PCI loans evaluated for impairment         4,100 2,778
Ending balance         6,532,126 5,568,428
Commercial            
Changes in allowance for loan losses            
Beginning balance 17,998 17,577 17,829 14,779    
Provision for loan loss 1,161 1,720 2,954 4,723    
Charged-off (2,563) (1,916) (4,370) (2,697)    
Recoveries 137 205 320 781    
Ending balance 16,733 17,586 16,733 17,586    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         2,358 4,319
Loans collectively evaluated for impairment         14,375 13,510
Ending balance 17,998 17,577 17,829 14,779 16,733 17,829
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         11,336 18,441
Loans collectively evaluated for impairment         1,656,731 1,386,247
PCI loans evaluated for impairment         31 418
Ending balance         1,668,098 1,405,106
Commercial real estate            
Changes in allowance for loan losses            
Beginning balance 20,097 22,090 21,137 21,813    
Provision for loan loss (97) 909 (1,186) 2,445    
Charged-off   (110) (15) (1,425)    
Recoveries 188 158 252 214    
Ending balance 20,188 23,047 20,188 23,047    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         1,367 1,181
Loans collectively evaluated for impairment         18,821 19,956
Ending balance 20,097 22,090 21,137 21,813 20,188 21,137
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         15,723 15,318
Loans collectively evaluated for impairment         2,643,721 2,349,243
PCI loans evaluated for impairment         2,461 2,262
Ending balance         2,661,905 2,366,823
Real estate construction            
Changes in allowance for loan losses            
Beginning balance 2,807 2,799 2,723 2,861    
Provision for loan loss 411 35 413 37    
Charged-off       (97)    
Recoveries 87 81 169 114    
Ending balance 3,305 2,915 3,305 2,915    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         3,305 2,723
Ending balance 2,807 2,799 2,723 2,915 3,305 2,723
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         751 453
Loans collectively evaluated for impairment         428,140 287,744
PCI loans evaluated for impairment         435  
Ending balance         429,326 288,197
Retail real estate            
Changes in allowance for loan losses            
Beginning balance 9,503 9,836 8,471 13,783    
Provision for loan loss 941 (548) 2,298 (4,210)    
Charged-off (200) (412) (717) (942)    
Recoveries 369 417 561 662    
Ending balance 10,613 9,293 10,613 9,293    
Allowance for loan losses Ending balance attributed to:            
Loans individually evaluated for impairment         474 61
Loans collectively evaluated for impairment         10,139 8,410
Ending balance 9,503 9,836 10,613 9,293 10,613 8,471
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         12,668 13,159
Loans collectively evaluated for impairment         1,707,529 1,466,876
PCI loans evaluated for impairment         1,173 98
Ending balance         1,721,370 1,480,133
Retail other            
Changes in allowance for loan losses            
Beginning balance 510 347 488 346    
Provision for loan loss 101 142 149 271    
Charged-off (178) (115) (308) (322)    
Recoveries 103 90 207 169    
Ending balance 536 464 536 464    
Allowance for loan losses Ending balance attributed to:            
Loans collectively evaluated for impairment         536 488
Ending balance $ 510 $ 347 $ 536 $ 464 536 488
Allowance for loan losses and recorded investments in portfolio loans by category            
Loans individually evaluated for impairment         34 33
Loans collectively evaluated for impairment         51,393 28,136
Ending balance         $ 51,427 $ 28,169