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Subordinated Debentures - Additional Information (Detail)
1 Months Ended 12 Months Ended
Apr. 30, 2007
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2007
Trust_Preferred_Securities
Subordinated Borrowing [Line Items]      
Redeem and refinance of floating rate subordinated debenture $ 5,000,000    
Refinancing at face value, reduction rate   2.00%  
Subordinated debenture, maturity period   30 years  
Subordinated debentures, principal amount percentage   100.00%  
Minimum [Member]      
Subordinated Borrowing [Line Items]      
Subordinated debentures may redeem part of principal amount   $ 1,000,000  
Futura Ban Corp [Member]      
Subordinated Borrowing [Line Items]      
Number of additional trust preferred securities acquired | Trust_Preferred_Securities     2
4.59% Debenture [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 12,500,000  
Debt, interest rate   4.59%  
Redemption of subordinated debentures description   The Company may redeem the subordinated debentures, in whole or in part, in a principal amount with integral multiples of $1,000, at 100% of the principal amount, plus accrued and unpaid interest.  
Subordinated Debentures [Member]      
Subordinated Borrowing [Line Items]      
Subordinated debenture, maturity date   Jun. 15, 2035  
5.52% Debenture [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 7,500,000  
Debt, interest rate   5.52%  
3.93% Debenture [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 5,000,000  
Debt, interest rate   3.93%  
6.05% Fixed Rate Trust Preferred Securities [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 12,500,000  
Debt, interest rate   6.05%  
Subordinated debenture, maturity term   5 years  
3.99% Debenture [Member] | Futura TPF Trust I [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 2,500,000  
Debt instrument, variable interest rate percentage   3.99%  
3.99% Debenture [Member] | Futura TPF Trust II [Member]      
Subordinated Borrowing [Line Items]      
Debt, face amount   $ 1,927,000  
Debt instrument, variable interest rate percentage   3.99%  
Subordinated Debenture [Member]      
Subordinated Borrowing [Line Items]      
Issuance of Trust Preferred Securities in exchange for Subordinated Debentures   $ 5,000,000  
Trust Preferred Securities [Member]      
Subordinated Borrowing [Line Items]      
Issuance of Trust Preferred Securities in exchange for Subordinated Debentures   7,500,000  
Trust Preferred Securities [Member] | Futura TPF Trust I [Member]      
Subordinated Borrowing [Line Items]      
Acquired trust preferred securities   2,500,000  
Trust Preferred Securities [Member] | Futura TPF Trust II [Member]      
Subordinated Borrowing [Line Items]      
Acquired trust preferred securities   $ 1,927,000