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Derivative Instruments - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Sep. 07, 2018 | May 03, 2011 | Mar. 31, 2019 | Dec. 31, 2018
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivatives designated as fair value hedges |  |  | $ 0 | $ 0
Accumulated other comprehensive loss estimated |  |  | 36,000 |
Collateral amount for counterparty interest rate swap |  |  | $ 400,000 | 200,000
2.98% Fixed Rate Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Interest rate being paid by the corporation |  |  | 4.53% |
Interest Rate Swaps |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Cash collateral pledged |  |  | $ 950,000 | $ 750,000
Unsecured Debt |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Term of contract | 5 years | 5 years |  |
Cash flow hedges | $ 10,000,000 | $ 10,000,000 |  |
Unsecured Debt | LIBOR Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Variable interest rate on subordinate debt |  |  | 4.16% |
Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivative fixed interest rate rate basis |  |  | 2.98% |
London Interbank Offered Rate (LIBOR) | Unsecured Debt | LIBOR Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Basis spread on variable rate |  |  | 155.00% |
London Interbank Offered Rate (LIBOR) | Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Basis spread on variable rate |  |  | 155.00% |

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- Definition Accumulated other comprehensive income loss estimated reclassification adjustment on derivatives included in net income in next twelve months. + References No definition available. + Details
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- Definition Cash collateral pledged. + References No definition available. + Details
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- Definition Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] + References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Average variable interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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