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Interest Rate Swaps - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
May 03, 2011 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |
Term of interest rate swap agreement executed | 5 years |  |
Interest rate swap inception date | May 03, 2011 |  |
Value of subordinated note hedged | $ 10,000,000 |  |
Interest rate swap effective date | Sep. 15, 2013 |  |
Interest rate |  | The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount. |
Derivatives designated as fair value hedges |  | $ 0 | $ 0
Accumulated other comprehensive loss estimated |  | 306,000 |
Collateral amount for counterparty interest rate swap |  | $ 1,400,000 | $ 1,400,000
LIBOR Plus 155 Basis Points [Member] |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  | LIBOR plus 155 basis points |
Variable interest rate on subordinate debt |  | 2.51% |
4.02% Fixed Rate Plus 155 Basis Points [Member] |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  | 4.02% fixed rate plus 155 basis points |
Interest rate being paid by the corporation |  | 5.57% |
Interest Rate Swaps [Member] |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |
Derivative basis spread on variable rate |  | 1.55% |
Derivative fixed interest rate rate basis |  | 4.02% |
Cash collateral pledged |  | $ 750,000 |

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