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Derivative Instruments - Additional Information (Detail) - USD ($)
3 Months Ended
Sep. 07, 2018
May 03, 2011
Mar. 31, 2019
Dec. 31, 2018
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     36,000  
Collateral amount for counterparty interest rate swap     $ 400,000 200,000
2.98% Fixed Rate Plus 155 Basis Points        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Interest rate being paid by the corporation     4.53%  
Interest Rate Swaps        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Cash collateral pledged     $ 950,000 $ 750,000
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     4.16%  
Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Derivative fixed interest rate rate basis     2.98%  
London Interbank Offered Rate (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]        
Basis spread on variable rate     155.00%  
London Interbank Offered Rate (LIBOR) | Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Basis spread on variable rate     155.00%