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Subordinated Debt - Additional Information (Detail)
$ in Millions
Oct. 30, 2015
USD ($)
6.75% Fixed Interest Subordinate Term Note [Member]  
Subordinated Borrowing [Line Items]  
Aggregate principal amount $ 5.0
Fixed interest rate 6.75%
Unsecured Debt [Member]  
Subordinated Borrowing [Line Items]  
Debt instrument maturity date Oct. 01, 2025
Debt instrument prepay date Oct. 30, 2020