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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
contract
Dec. 31, 2019
USD ($)
loan
contract
Loans and Leases Receivable Disclosure [Line Items]    
Unamortized net deferred fees $ 30,800 $ 25,200
Serving assets not reflected as loan balances $ 124,000 99,000
Loans secured by real estate (percent) 85.00%  
Repricing duration 22 months  
Financing receivable, net $ 7,650,633 7,472,090
Provision for Loan and Lease Losses $ 45,404 $ 13,091
Credit modification, number of loans | loan 750  
Credit modification exposure amount $ 1,600,000  
Credit modification, deferrals, number of loans | loan 36  
Credit modification, deferrals, exposure amount $ 72,400  
Credit modification, exposure percentage 0.90%  
Number of loans | contract 10 9
Financing receivable, modifications, recorded investment $ 19,200 $ 19,100
Number of restructured loans | loan 2  
Recorded investment - restructured loans, whose collateral property sold $ 870  
Number of defaulted loans charged-off | loan 1  
Restructured loans, proceeds from sale of collateral property $ 138  
Number of loans modified in TDR | loan 2 1
Recorded investment - loans modified in TDR $ 572 $ 2,300
ADC Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Financing receivable, net $ 1,400,000  
Percent of ADC loan portfolio using interest reserves 61.40%  
Home equity    
Loans and Leases Receivable Disclosure [Line Items]    
Unamortized net deferred fees $ 30 32
Provision for Loan and Lease Losses $ 230 57
Owner Occupied Commercial Real Estate and Construction    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 15.00%  
Income Producing Commercial Real Estate and Real Estate Construction    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 58.00%  
Maximum loan to value (percent) 80.00%  
Minimum cash flow debt service coverage ratio 1.15  
Loan term 5 years  
Stress test assumption increase interest rates 2.00%  
Commercial Real Estate and Real Estate Construction Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 73.00%  
Commercial    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 19.00%  
Provision for Loan and Lease Losses $ 18,797 7,438
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  
Commercial | SBA Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 1.00%  
Consumer Portfolio Segment    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 1.00%  
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    
Loans and Leases Receivable Disclosure [Line Items]    
Provision for Loan and Lease Losses $ 579 $ 589
Real estate mortgage - residential | Real Estate Loan    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 1.00%  
Real estate mortgage - residential | Land Acquisition Development and Construction Loans | Maximum    
Loans and Leases Receivable Disclosure [Line Items]    
Loan term 36 months  
PPP loans    
Loans and Leases Receivable Disclosure [Line Items]    
Percent of loan portfolio 6.00%  
Performing Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Number of loans | loan 6 7
Financing receivable, modifications, recorded investment $ 10,500 $ 16,600
Non-Performing Loans    
Loans and Leases Receivable Disclosure [Line Items]    
Financing receivable, modifications, recorded investment $ 6,300 $ 9,500
Number of loans subsequent defaults reclassified to non-performing | loan 2 3