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Portfolio loans - Allowance for Loan Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Changes in allowance for loan losses        
Beginning balance $ 50,648 $ 53,582    
Provision for loan loss 2,111 1,008    
Charged-off (2,469) (2,930)    
Recoveries 625 989    
Ending balance 50,915 52,649    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     $ 5,399 $ 5,561
Loans collectively evaluated for impairment     45,516 45,087
Ending balance 50,648 53,582 50,915 50,648
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     45,795 47,404
Loans collectively evaluated for impairment     6,464,603 5,518,246
PCI loans evaluated for impairment     4,683 2,778
Ending balance     6,515,081 5,568,428
Commercial        
Changes in allowance for loan losses        
Beginning balance 17,829 14,779    
Provision for loan loss 1,793 3,003    
Charged-off (1,807) (781)    
Recoveries 183 576    
Ending balance 17,998 17,577    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     4,126 4,319
Loans collectively evaluated for impairment     13,872 13,510
Ending balance 17,829 14,779 17,998 17,829
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     16,361 18,441
Loans collectively evaluated for impairment     1,640,630 1,386,247
PCI loans evaluated for impairment     31 418
Ending balance     1,657,022 1,405,106
Commercial real estate        
Changes in allowance for loan losses        
Beginning balance 21,137 21,813    
Provision for loan loss (1,089) 1,536    
Charged-off (15) (1,315)    
Recoveries 64 56    
Ending balance 20,097 22,090    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     1,231 1,181
Loans collectively evaluated for impairment     18,866 19,956
Ending balance 21,137 21,813 20,097 21,137
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     15,733 15,318
Loans collectively evaluated for impairment     2,679,200 2,349,243
PCI loans evaluated for impairment     4,558 2,262
Ending balance     2,699,491 2,366,823
Real estate construction        
Changes in allowance for loan losses        
Beginning balance 2,723 2,861    
Provision for loan loss 2 2    
Charged-off   (97)    
Recoveries 82 33    
Ending balance 2,807 2,799    
Allowance for loan losses Ending balance attributed to:        
Loans collectively evaluated for impairment     2,807 2,723
Ending balance 2,723 2,861 2,807 2,723
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     385 453
Loans collectively evaluated for impairment     387,238 287,744
Ending balance     387,623 288,197
Retail real estate        
Changes in allowance for loan losses        
Beginning balance 8,471 13,783    
Provision for loan loss 1,357 (3,662)    
Charged-off (517) (530)    
Recoveries 192 245    
Ending balance 9,503 9,836    
Allowance for loan losses Ending balance attributed to:        
Loans individually evaluated for impairment     42 61
Loans collectively evaluated for impairment     9,461 8,410
Ending balance 8,471 13,783 9,503 8,471
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     13,296 13,159
Loans collectively evaluated for impairment     1,705,025 1,466,876
PCI loans evaluated for impairment     94 98
Ending balance     1,718,415 1,480,133
Retail other        
Changes in allowance for loan losses        
Beginning balance 488 346    
Provision for loan loss 48 129    
Charged-off (130) (207)    
Recoveries 104 79    
Ending balance 510 347    
Allowance for loan losses Ending balance attributed to:        
Loans collectively evaluated for impairment     510 488
Ending balance $ 488 $ 346 510 488
Allowance for loan losses and recorded investments in portfolio loans by category        
Loans individually evaluated for impairment     20 33
Loans collectively evaluated for impairment     52,510 28,136
Ending balance     $ 52,530 $ 28,169