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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
loan
contract
Dec. 31, 2020
USD ($)
contract
loan
Loans and Leases Receivable Disclosure [Line Items]    
Unamortized net deferred fees $ 26,900 $ 30,800
Servicing asset 120,300 124,000
Financing receivable, net $ 6,990,633 $ 7,650,633
Number of loans | contract 7 10
Financing receivable, modifications, recorded investment $ 16,500 $ 19,200
Number of loans modified in TDR | loan 0 2
Recorded investment - loans modified in TDR   $ 572
Number of non-performing loans that had collateral liquidated | loan   2
Number of non-performing loans that had collateral liquidated amount   $ 870
Number of loans previously defaulted charged off | loan   1
Number of loans previously defaulted charged off, amount   $ 138
ADC Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Financing receivable, net $ 1,500,000  
Percent of ADC loan portfolio using interest reserves 64.00%  
Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Unamortized net deferred fees $ 15 $ 30
Income Producing Commercial Real Estate and Real Estate Construction    
Loans and Leases Receivable Disclosure [Line Items]    
Minimum cash flow debt service coverage ratio 1.15  
Stress test assumption increase interest rates 2.00%  
Commercial | Minimum    
Loans and Leases Receivable Disclosure [Line Items]    
Preferred loan term 5 years  
Commercial | Maximum    
Loans and Leases Receivable Disclosure [Line Items]    
Loan term 10 years  
Preferred loan term 7 years  
Amortization term 25 years  
Consumer Portfolio Segment | Land Acquisition Development and Construction Loans | Maximum    
Loans and Leases Receivable Disclosure [Line Items]    
Loan term 24 months  
Real estate mortgage - residential | Land Acquisition Development and Construction Loans | Maximum    
Loans and Leases Receivable Disclosure [Line Items]    
Loan term 36 months  
Performing Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Number of loans | loan 5 7
Financing receivable, modifications, recorded investment $ 10,200 $ 10,500
Non-Performing Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Financing receivable, modifications, recorded investment $ 101 $ 6,300
Number of loans subsequent defaults reclassified to non-performing | loan 1 2