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Interest Rate Swaps - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 07, 2018
May 03, 2011
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Derivatives designated as fair value hedges     $ 0 $ 0
Accumulated other comprehensive loss estimated     17,000  
Interest Rate Swaps        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Cash collateral balance     $ 200,000 $ 1,400,000
Unsecured Debt        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Term of contract 5 years 5 years    
Cash flow hedges $ 10,000,000 $ 10,000,000    
Unsecured Debt | LIBOR Plus 155 Basis Points        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Variable interest rate on subordinate debt     4.36%  
Unsecured Debt | LIBOR Plus 155 basis points at 2.98%        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Variable interest rate on subordinate debt     4.53%  
Derivative fixed interest rate rate basis     2.98%  
LIBOR | Unsecured Debt | LIBOR Plus 155 Basis Points        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Derivative basis spread on variable rate     155.00%  
LIBOR | Unsecured Debt | LIBOR Plus 155 basis points at 2.98%        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Derivative basis spread on variable rate     155.00%