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Portfolio Loans -Summary of portfolio loans that are past due and still accruing or on a non-accrual status (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Commercial loans $ 7,856,160 $ 7,725,702
90 days past due and still accruing 709 673
Non-accrual Loans 11,298 15,067
30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 4,557 5,249
60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 1,377 1,299
Past due and non-accrual commercial loans    
Financing Receivable, Past Due [Line Items]    
Commercial loans 5,824,800 5,766,496
90 days past due and still accruing 51 0
Non-accrual Loans 7,186 11,818
Past due and non-accrual commercial loans | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 0 126
Past due and non-accrual commercial loans | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 465 0
Commercial    
Financing Receivable, Past Due [Line Items]    
Commercial loans 1,943,449 1,974,154
90 days past due and still accruing 51 0
Non-accrual Loans 5,628 6,174
Commercial | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 0 2
Commercial | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 112 0
Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Commercial loans 3,353,753 3,261,873
90 days past due and still accruing 0 0
Non-accrual Loans 1,558 5,644
Commercial real estate | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 0 124
Commercial real estate | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 109 0
Real estate construction    
Financing Receivable, Past Due [Line Items]    
Commercial loans 527,598 530,469
90 days past due and still accruing 0  
Non-accrual Loans 0  
Real estate construction | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 0  
Real estate construction | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 244  
Past due and non-accrual retail loans    
Financing Receivable, Past Due [Line Items]    
Commercial loans 2,031,360 1,959,206
90 days past due and still accruing 658 673
Non-accrual Loans 4,112 3,249
Past due and non-accrual retail loans | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 4,557 5,123
Past due and non-accrual retail loans | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 912 1,299
Retail real estate    
Financing Receivable, Past Due [Line Items]    
Commercial loans 1,715,445 1,657,082
90 days past due and still accruing 558 673
Non-accrual Loans 4,042 3,096
Retail real estate | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 3,643 4,709
Retail real estate | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 840 1,239
Retail other    
Financing Receivable, Past Due [Line Items]    
Commercial loans 315,915 302,124
90 days past due and still accruing 100 0
Non-accrual Loans 70 153
Retail other | 30 to 59 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans 914 414
Retail other | 60 to 89 days past due and still accruing    
Financing Receivable, Past Due [Line Items]    
Commercial loans $ 72 $ 60