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Derivative Instruments - Amounts and Locations of Activity Related to Back-to-Back Interest Rate Swaps within Corporation's Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
3rd Party interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Notional Amount | $ 23,014 | $ 23,152
Weighted Average Maturity (in years) | 7 years 1 month 6 days | 7 years 2 months 12 days
Weighted Average Fixed Rate | 3.85% | 3.85%
Fair Value | $ 906 | $ 485
Customer interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative Liability, Notional Amount | $ (23,014) | $ (23,152)
Weighted Average Maturity (in years) | 7 years 1 month 6 days | 7 years 2 months 12 days
Weighted Average Fixed Rate | 3.85% | 3.85%
Fair Value | $ (906) | $ (485)
London Interbank Offered Rate (LIBOR) | 3rd Party interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Basis spread on variable rate | 2.24% | 2.24%
London Interbank Offered Rate (LIBOR) | Customer interest rate swaps |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Basis spread on variable rate | 2.24% | 2.24%

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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