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Subordinated Debt - Additional Information (Detail) - Subordinated debt [Member]
 1 Months Ended
Nov. 20, 2015
USD ($)
Subordinated Borrowing [Line Items]  
Subordinated debt instrument face value $ 10,000,000
Subordinated debt instrument maturity date Dec. 01, 2025
Subordinated debt interest rate terms The Notes bear interest, payable on the 1st of June and December of each year, commencing June 1, 2016, at a fixed rate of 6.75% per year for the first five years, and thereafter will bear a floating interest rate of LIBOR plus 512.8 basis points.
Subordinated debt instrument fixed rate of interest 6.75%
Subordinated debt instrument variable interest rate spread 5.13%
Subordinated debt instrument call feature The Company has the right to redeem the Notes, in whole or in part, without premium or penalty, at any interest payment date on or after December 1, 2020 and prior to the maturity date, but in all cases in a principal amount with integral multiples of $1,000, plus interest accrued and unpaid through the date of redemption.
Subordinated debt instrument date of first required payment Jun. 01, 2016
Subordinated debt issuance costs $ 338,813