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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
qtr
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Loans and Leases Receivable Disclosure [Line Items]          
Deferred commitment fee $ 22,700   $ 22,700   $ 30,800
Serving assets not reflected as loan balances $ 115,000   $ 115,000   124,000
Loans secured by real estate (percent) 80.00%   80.00%    
PPP loans, net $ 6,767,957   $ 6,767,957   7,650,633
Provision for credit losses utilizing the newly adopted methodology     3,371 $ 856  
Net charge-offs 1,328 $ 5,170 $ 12,175 14,555  
Number of Nonperforming Restructured Loans, Charged Off | qtr     1    
Criticized | ASU 2016-13          
Loans and Leases Receivable Disclosure [Line Items]          
Provision for credit losses utilizing the newly adopted methodology 8,200 6,600 $ 14,400 40,700  
ADC Loans          
Loans and Leases Receivable Disclosure [Line Items]          
PPP loans, net $ 1,400,000   $ 1,400,000    
Percent of ADC loan portfolio using interest reserves 57.50%   57.50%    
Owner Occupied Commercial Real Estate and Construction          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 17.00%   17.00%    
Commercial Real Estate and Real Estate Construction Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 78.00%   78.00%    
Income Producing Commercial Real Estate and Real Estate Construction          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 61.00%   61.00%    
Maximum loan to value (percent) 80.00%   80.00%    
Income Producing Commercial Real Estate and Real Estate Construction | Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Minimum cash flow debt service coverage ratio 1.15   1.15    
Income Producing Commercial Real Estate and Real Estate Construction | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Minimum cash flow debt service coverage ratio 1.0   1.0    
Commercial          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 19.00%   19.00%    
Provision for credit losses utilizing the newly adopted methodology     $ 146 227  
Net charge-offs $ 1,918 142 $ 7,365 7,216  
Commercial | Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period, preferred term     5 years    
Commercial | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period, preferred term     7 years    
Loan period     10 years    
Amortization term     25 years    
Commercial | SBA Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
PPP loans | SBA Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
Consumer Portfolio Segment          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
Consumer Portfolio Segment | Land Acquisition Development and Construction Loans | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period     24 months    
Real estate mortgage - residential          
Loans and Leases Receivable Disclosure [Line Items]          
Net charge-offs $ 0 0 $ 0 0  
Real estate mortgage - residential | Real Estate Loan          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 1.00%   1.00%    
Repricing duration     21 months    
Real estate mortgage - residential | Land Acquisition Development and Construction Loans | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period     36 months    
Non-Performing Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Troubled debt restructuring   $ 572   $ 572  
Performing Financial Instruments          
Loans and Leases Receivable Disclosure [Line Items]          
Troubled debt restructuring $ 10,200   $ 10,200   $ 10,500