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Loans and Allowance for Credit Losses - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Unamortized net deferred fees $ 25,200 $ 26,500  
Serving assets not reflected as loan balances $ 99,000 111,000  
Stress test assumption increase interest rates 2.00%    
Financing receivable, net $ 7,545,748 6,991,447  
Financing receivable, modifications, recorded investment $ 19,100 24,600  
Number Of Restructured Loans | loan 3    
Amount of loans restructured during the period. $ 9,500    
Number of restructured loans, whose collateral property sold | loan 1    
Recorded investment - restructured loans, whose collateral property sold $ 4,800    
Restructured loans, proceeds from sale of collateral property 3,000    
Recorded investment - Remaining amount charged-off 1,800    
Recorded investment - defaulted charged-off $ 2,300 1,400  
Number of loans re-underwritten | loan 1    
Recorded investment - re-underwritten loans $ 10,400    
Loans Re-underwritten, number of new loans | loan 2    
Nonaccrual loans, gross interest income if in compliance $ 3,000 1,000  
Nonaccrual loans, recorded interest income $ 630 265  
Loans secured by real estate (percent) 85.00%    
Loans receivable-related parties $ 52,368 167,884 $ 238,236
ADC Loans      
Percent of ADC loan portfolio using interest reserves 65.00%    
Financing receivable, net $ 1,610,000    
Home Equity      
Unamortized net deferred fees 32 60  
Financing receivable, net $ 80,061 86,603  
Owner Occupied Commercial Real Estate and Construction      
Percent of loan portfolio 14.00%    
Income Producing Commercial Real Estate and Real Estate Construction      
Percent of loan portfolio 64.00%    
Minimum cash flow debt service coverage ratio 1.15    
Maximum loan to value (percent) 80.00%    
Commercial Real Estate and Real Estate Construction Loans      
Percent of loan portfolio 78.00%    
Commercial      
Percent of loan portfolio 20.00%    
Financing receivable, net $ 1,545,906 1,553,112  
Commercial | Minimum | Preferred Term      
Loan period 5 years    
Commercial | Maximum      
Loan period 10 years    
Amortization term 25 years    
Commercial | Maximum | Preferred Term      
Loan period 7 years    
Commercial | SBA Loans      
Percent of loan portfolio 1.00%    
Consumer Portfolio Segment      
Percent of loan portfolio 1.00%    
Consumer Portfolio Segment | Land Acquisition Development and Construction Loans | Maximum      
Loan period 24 months    
Real Estate Mortgage Residential      
Financing receivable, net $ 104,221 106,418  
Real Estate Mortgage Residential | Real Estate Loan      
Percent of loan portfolio 1.00%    
Real Estate Mortgage Residential | Land Acquisition Development and Construction Loans | Maximum      
Loan period 36 months    
Performing Loans      
Financing receivable, modifications, recorded investment $ 16,600 24,000  
Non-Performing Loans      
Financing receivable, modifications, recorded investment $ 9,500 $ 460