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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Lessors of Nonresidential Buildings    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Principal Balances $ 3,149,948  
Unfunded Commitments 782,111  
Total exposure 3,932,059 $ 3,483,597
Lessors of Residential Buildings and Dwellings [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Principal Balances 1,200,653  
Unfunded Commitments 284,044  
Total exposure 1,484,697 1,151,676
New housing for-sale builders    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Principal Balances 511,484  
Unfunded Commitments 589,505  
Total exposure 1,100,989 780,137
Hotels and motels    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Principal Balances 779,390  
Unfunded Commitments 140,611  
Total exposure $ 920,001 $ 836,320