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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
loan
Jun. 30, 2021
loan
Sep. 30, 2022
USD ($)
loan
contract
Sep. 30, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
contract
Loans and Leases Receivable Disclosure [Line Items]          
Deferred commitment fee $ 27,400   $ 27,400   $ 26,900
Servicing asset at fair value 362,700   362,700   351,100
Loans, net 7,228,731   $ 7,228,731   $ 6,990,633
Number of TDR loans | contract     5   7
Troubled debt restructured     $ 24,500   $ 16,500
Number of loans sold | loan   1 2    
Gain on cancellation of debt     $ 1,400    
ADC Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Loans, net $ 1,500,000   $ 1,500,000    
Percent of ADC loan portfolio using interest reserves 54.10%   54.10%    
Real estate mortgage - residential | Land Acquisition Development and Construction Loans | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period     36 months    
Consumer Portfolio Segment | Land Acquisition Development and Construction Loans | Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Loan period     24 months    
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 | 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    
Non-Performing Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Number of contracts modified in TDR | loan 1   1 0  
Troubled debt restructuring $ 19,200   $ 19,200 $ 19,200  
Number of loans subsequent defaults reclassified to non-performing | loan 4   4    
Restructured and subsequent defaulted $ 30,300   $ 30,300    
Performing Financial Instruments          
Loans and Leases Receivable Disclosure [Line Items]          
Troubled debt restructuring $ 24,500   $ 24,500   $ 10,200
Number of loans subsequent defaults reclassified to non-performing | loan     0 1,000  
Restructured and subsequent defaulted       $ 101