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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Unamortized net deferred fees   $ 24,800     $ 25,200
Serving assets not reflected as loan balances   101,000     99,000
Credit modification exposure $ 576,000 45,000      
Financing receivable, net   $ 7,840,873     7,545,748
Loans secured by real estate (percent)   82.00%      
Increase in allowance for credit losses   $ 14,310 $ 3,360    
Reserve for unfunded commitments   6,230   $ 4,118  
Provision for credit losses utilizing the newly adopted methodology   1,007 3,775    
Net charge-offs   2,246 3,361    
Loans and leases receivable, net of deferred income   7,840,873     7,545,748
ASU 2016-13          
Increase in allowance for credit losses   14,700      
Reserve for unfunded commitments   4,100      
Criticized | ASU 2016-13          
Provision for credit losses utilizing the newly adopted methodology   $ 16,400      
ADC Loans          
Percent of ADC loan portfolio using interest reserves   60.00%      
Financing receivable, net   $ 1,410,000      
Home Equity          
Financing receivable, net   78,228     80,061
Increase in allowance for credit losses   (83) 6    
Loans and leases receivable, net of deferred income   $ 78,228   80,061 80,061
Owner Occupied Commercial Real Estate and Construction          
Percent of loan portfolio   13.00%      
Income Producing Commercial Real Estate and Real Estate Construction          
Percent of loan portfolio   62.00%      
Maximum loan to value (percent)   80.00%      
Income Producing Commercial Real Estate and Real Estate Construction | Minimum          
Minimum cash flow debt service coverage ratio   1.15      
Income Producing Commercial Real Estate and Real Estate Construction | Maximum          
Minimum cash flow debt service coverage ratio   1.0      
Commercial Real Estate and Real Estate Construction Loans [Member]          
Percent of loan portfolio   75.00%      
Commercial          
Percent of loan portfolio   23.00%      
Financing receivable, net   $ 1,773,478     1,545,906
Increase in allowance for credit losses   7,553 1,212    
Provision for credit losses utilizing the newly adopted methodology     775    
Net charge-offs   (69) (126)    
Loans and leases receivable, net of deferred income   $ 1,773,478   1,545,906 1,545,906
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   1.20%      
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   $ 104,558     104,221
Increase in allowance for credit losses   113 (285)    
Net charge-offs     $ (1)    
Loans and leases receivable, net of deferred income   $ 104,558   $ 104,221 $ 104,221
Real Estate Mortgage Residential | Real Estate Loan          
Percent of loan portfolio   1.00%      
Repricing duration   17 months      
Real Estate Mortgage Residential | Land Acquisition Development and Construction Loans | Maximum          
Loan period   36 months