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Loans and Allowance for Credit Losses - Amortized cost basis of collateral-dependent loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net $ 7,082,021 $ 6,990,633
Business or Other Assets    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 5,637 7,656
Business or Other Assets | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 2,517 3,098
Business or Other Assets | PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 1,365
Business or Other Assets | Income-producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 3,120 3,193
Business or Other Assets | Owner-occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 0
Business or Other Assets | Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 0
Business or Other Assets | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 0
Business or Other Assets | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 0
Real Estate    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 18,312 31,479
Real Estate | Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 6,764 6,821
Real Estate | PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 0
Real Estate | Income-producing - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 8,154 19,378
Real Estate | Owner-occupied - commercial real estate    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 27 42
Real Estate | Real estate mortgage - residential    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 3,059 1,779
Real Estate | Construction - commercial and residential    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net 0 3,093
Real Estate | Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
PPP loans, net $ 308 $ 366