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Interest-Rate Swaps (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |
Weighted average pay rate on interest-rate swaps | 4.60% | 4.53%
Weighted average receive rate on interest-rate swaps | 4.30% | 4.78%
Weighted average maturity (years) | 4 years 1 month 6 days | 4 years 4 months 24 days
Fair value of interest-rate swaps | $ (2,514) | $ (767)
Fair value of loan yield maintenance provisions | 2,514 | 767
Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amounts | $ 41,641 | $ 35,996

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