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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
contract
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2022
USD ($)
qtr
Mar. 31, 2021
USD ($)
Mar. 31, 2021
contract
Mar. 31, 2021
loan
Dec. 31, 2021
USD ($)
Loans and Leases Receivable Disclosure [Line Items]                  
Deferred commitment fee $ 23,700 $ 23,700 $ 23,700 $ 23,700 $ 23,700       $ 26,900
Servicing asset at fair value 339,500 339,500 339,500 339,500 339,500       351,100
Loans, net 7,042,302 7,042,302 $ 7,042,302 $ 7,042,302 $ 7,042,302       6,990,633
Net charge-offs   459       $ 5,248      
Number of TDR loans | contract     7       8    
Troubled debt restructured   16,463       16,771      
Restructured and subsequent defaulted   6,342       6,443      
Number of loans - restructured accruing     5 1     5 1  
Number of nonperforming restructured loans, charged off | qtr         0        
ADC Loans                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loans, net $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000        
Percent of ADC loan portfolio using interest reserves 57.20% 57.20% 57.20% 57.20% 57.20%        
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 1.15 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 1.0 1.0 1.0        
Commercial                  
Loans and Leases Receivable Disclosure [Line Items]                  
Net charge-offs   $ 460       4,054      
Troubled debt restructured   1,016       1,258      
Restructured and subsequent defaulted   0       101      
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                
Amortization term 25 years                
Loan period, preferred term 7 years                
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      
Real estate mortgage - residential | Land Acquisition Development and Construction Loans | Maximum                  
Loans and Leases Receivable Disclosure [Line Items]                  
Loan period 36 months                
Home equity                  
Loans and Leases Receivable Disclosure [Line Items]                  
Net charge-offs   0       0      
Non-Performing Loans                  
Loans and Leases Receivable Disclosure [Line Items]                  
Number of loans subsequent defaults reclassified to non-performing | loan       2,000       1,000  
Restructured and subsequent defaulted           $ 101      
Performing Financial Instruments                  
Loans and Leases Receivable Disclosure [Line Items]                  
Number of TDR loans | contract     5            
Troubled debt restructured   10,100              
Troubled debt restructuring $ 10,100 $ 10,100 $ 10,100 $ 10,100 $ 10,100       $ 10,200