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Portfolio loans and allowance for credit losses - Activity in the allowance for loan losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Activity in the allowance for loan losses          
Beginning balance $ 53,748 $ 50,648 $ 53,582    
Provision for loan losses 38,797 10,406 4,429    
Charged-off (11,088) (11,760) (10,944)    
Recoveries 2,758 4,454 3,581    
Ending balance 101,048 53,748 50,648    
Allowance for loan losses Ending balance attributed to:          
Loans individually evaluated for impairment       $ 1,625 $ 4,853
Loans collectively evaluated for impairment       99,423 48,895
Ending balance 53,748 50,648 53,582 101,048 53,748
Loans:          
Loans individually evaluated for impairment       17,974 34,031
Loans collectively evaluated for impairment       6,793,931 6,650,170
PCI loans evaluated for impairment       2,272 3,048
Ending balance       6,814,177 6,687,249
Commercial Loans          
Activity in the allowance for loan losses          
Beginning balance 18,291 17,829 14,779    
Provision for loan losses 10,832 4,893 5,767    
Charged-off (6,376) (6,478) (3,968)    
Recoveries 404 2,047 1,251    
Ending balance 23,866 18,291 17,829    
Allowance for loan losses Ending balance attributed to:          
Loans individually evaluated for impairment       1,600 3,330
Loans collectively evaluated for impairment       22,266 14,961
Ending balance 23,866 17,829 17,829 23,866 18,291
Loans:          
Loans individually evaluated for impairment       8,372 9,740
Loans collectively evaluated for impairment       2,006,204 1,738,615
PCI loans evaluated for impairment         13
Ending balance       2,014,576 1,748,368
Commercial Real Estate Loans          
Activity in the allowance for loan losses          
Beginning balance 21,190 21,137 21,813    
Provision for loan losses 17,511 3,002 3,227    
Charged-off (1,972) (3,257) (4,352)    
Recoveries 195 308 449    
Ending balance 46,230 21,190 21,137    
Allowance for loan losses Ending balance attributed to:          
Loans individually evaluated for impairment         1,049
Loans collectively evaluated for impairment       46,230 20,141
Ending balance 21,190 21,137 21,137 46,230 21,190
Loans:          
Loans individually evaluated for impairment       4,161 10,018
Loans collectively evaluated for impairment       2,886,468 2,781,495
PCI loans evaluated for impairment       1,906 1,904
Ending balance       2,892,535 2,793,417
Real Estate Construction          
Activity in the allowance for loan losses          
Beginning balance 3,204 2,723 2,861    
Provision for loan losses 1,452 (70) (259)    
Charged-off (18)   (97)    
Recoveries 601 551 218    
Ending balance 8,193 3,204 2,723    
Allowance for loan losses Ending balance attributed to:          
Loans collectively evaluated for impairment       8,193 3,204
Ending balance 3,204 3,204 2,861 8,193 3,204
Loans:          
Loans individually evaluated for impairment       292 539
Loans collectively evaluated for impairment       461,494 400,887
PCI loans evaluated for impairment         435
Ending balance       461,786 401,861
Retail Real Estate          
Activity in the allowance for loan losses          
Beginning balance 10,495 8,471 13,783    
Provision for loan losses 9,050 2,102 (4,824)    
Charged-off (2,057) (1,162) (1,815)    
Recoveries 1,212 1,084 1,327    
Ending balance 21,992 10,495 8,471    
Allowance for loan losses Ending balance attributed to:          
Loans individually evaluated for impairment       25 474
Loans collectively evaluated for impairment       21,967 10,021
Ending balance 10,495 10,495 13,783 21,992 10,495
Loans:          
Loans individually evaluated for impairment       5,149 13,676
Loans collectively evaluated for impairment       1,402,337 1,679,397
PCI loans evaluated for impairment       366 696
Ending balance       1,407,852 1,693,769
Retail Other          
Activity in the allowance for loan losses          
Beginning balance 568 488 346    
Provision for loan losses (48) 479 518    
Charged-off (665) (863) (712)    
Recoveries 346 464 336    
Ending balance 767 568 488    
Allowance for loan losses Ending balance attributed to:          
Loans collectively evaluated for impairment       767 568
Ending balance 568 568 $ 346 767 568
Loans:          
Loans individually evaluated for impairment         58
Loans collectively evaluated for impairment       37,428 49,776
Ending balance       $ 37,428 49,834
Cumulative Effect, Period of Adoption, Adjustment          
Activity in the allowance for loan losses          
Beginning balance 16,833        
Ending balance   16,833      
Allowance for loan losses Ending balance attributed to:          
Ending balance 16,833 16,833     16,833
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans          
Activity in the allowance for loan losses          
Beginning balance 715        
Ending balance   715      
Allowance for loan losses Ending balance attributed to:          
Ending balance 715 715     715
Cumulative Effect, Period of Adoption, Adjustment | Commercial Real Estate Loans          
Activity in the allowance for loan losses          
Beginning balance 9,306        
Ending balance   9,306      
Allowance for loan losses Ending balance attributed to:          
Ending balance 9,306 9,306     9,306
Cumulative Effect, Period of Adoption, Adjustment | Real Estate Construction          
Activity in the allowance for loan losses          
Beginning balance 2,954        
Ending balance   2,954      
Allowance for loan losses Ending balance attributed to:          
Ending balance 2,954 2,954     2,954
Cumulative Effect, Period of Adoption, Adjustment | Retail Real Estate          
Activity in the allowance for loan losses          
Beginning balance 3,292        
Ending balance   3,292      
Allowance for loan losses Ending balance attributed to:          
Ending balance 3,292 3,292     3,292
Cumulative Effect, Period of Adoption, Adjustment | Retail Other          
Activity in the allowance for loan losses          
Beginning balance 566        
Ending balance   566      
Allowance for loan losses Ending balance attributed to:          
Ending balance $ 566 $ 566     $ 566