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Derivative Instruments - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
May 03, 2011 | Mar. 31, 2018 | Dec. 31, 2017
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 |  | 217,000 |
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 |  | 3.43% |
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 | $ 750,000

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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 + Details
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