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Portfolio Loans - Schedule of allowance for loan losses and recorded investments in portfolio loans, by category (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Portfolio Loans            
Collectively Evaluated for Impairment $ 7,849,163   $ 7,710,055      
Individually Evaluated for Impairment 6,997   15,647      
Total 7,856,160   7,725,702      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 89,993   87,107      
Individually Evaluated for Impairment 1,717   4,501      
Total 91,710 $ 91,639 91,608 $ 90,722 $ 88,757 $ 87,887
Total commercial loans            
Portfolio Loans            
Collectively Evaluated for Impairment 5,817,889   5,753,438      
Individually Evaluated for Impairment 6,911   13,058      
Total 5,824,800   5,766,496      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 60,838   64,140      
Individually Evaluated for Impairment 1,692   4,476      
Total 62,530   68,616      
Commercial            
Portfolio Loans            
Collectively Evaluated for Impairment 1,937,943   1,967,580      
Individually Evaluated for Impairment 5,506   6,574      
Total 1,943,449   1,974,154      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 21,057   21,384      
Individually Evaluated for Impairment 1,576   2,476      
Total 22,633 24,510 23,860 23,695 23,359 23,855
Commercial real estate            
Portfolio Loans            
Collectively Evaluated for Impairment 3,352,348   3,255,636      
Individually Evaluated for Impairment 1,405   6,237      
Total 3,353,753   3,261,873      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 34,575   36,299      
Individually Evaluated for Impairment 116   2,000      
Total 34,691 33,656 38,299 37,799 37,182 38,249
Real estate construction            
Portfolio Loans            
Collectively Evaluated for Impairment 527,598   530,222      
Individually Evaluated for Impairment 0   247      
Total 527,598   530,469      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 5,206   6,457      
Individually Evaluated for Impairment 0   0      
Total 5,206 5,071 6,457 5,971 5,669 5,102
Total retail loans            
Portfolio Loans            
Collectively Evaluated for Impairment 2,031,274   1,956,617      
Individually Evaluated for Impairment 86   2,589      
Total 2,031,360   1,959,206      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 29,155   22,967      
Individually Evaluated for Impairment 25   25      
Total 29,180   22,992      
Retail real estate            
Portfolio Loans            
Collectively Evaluated for Impairment 1,715,359   1,654,493      
Individually Evaluated for Impairment 86   2,589      
Total 1,715,445   1,657,082      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 25,308   18,168      
Individually Evaluated for Impairment 25   25      
Total 25,333 24,675 18,193 18,620 17,984 17,589
Retail other            
Portfolio Loans            
Collectively Evaluated for Impairment 315,915   302,124      
Individually Evaluated for Impairment 0   0      
Total 315,915   302,124      
ACL Attributed to Portfolio Loans            
Collectively Evaluated for Impairment 3,847   4,799      
Individually Evaluated for Impairment 0   0      
Total $ 3,847 $ 3,727 $ 4,799 $ 4,637 $ 4,563 $ 3,092