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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 |

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