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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]          
Deferred commitment fee $ 25,000   $ 25,000   $ 30,800
Serving assets not reflected as loan balances $ 125,000   $ 125,000   124,000
Loans secured by real estate (percent) 83.00%   83.00%    
PPP loans, net $ 7,166,998   $ 7,166,998   $ 7,650,633
Provision for credit losses utilizing the newly adopted methodology     3,072 $ 1,552  
Net charge-offs (5,599) $ (7,139) (10,847) (9,385)  
Criticized | ASU 2016-13          
Loans and Leases Receivable Disclosure [Line Items]          
Provision for credit losses utilizing the newly adopted methodology 3,900 19,700 6,200 34,000  
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 57.90%   57.90%    
Owner Occupied Commercial Real Estate and Construction          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 16.00%   16.00%    
Commercial Real Estate and Real Estate Construction Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 76.00%   76.00%    
Income Producing Commercial Real Estate and Real Estate Construction          
Loans and Leases Receivable Disclosure [Line Items]          
Percent of loan portfolio 60.00%   60.00%    
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     $ 364 257  
Net charge-offs $ (1,391) (7,140) $ (5,445) (7,071)  
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     10 years    
Loan period, preferred term     7 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 3.00%   3.00%    
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