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v3.19.1

Premium on Debt Securities - Additional Information (Details) - Accounting Standards Update 2017-08 [Member] - USD ($) | Jul. 01, 2018 | Jun. 30, 2018
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Cumulative-effect adjustment to retained earnings |  | $ (531,000)
Retained Earnings [Member] |  |
Cumulative-effect adjustment to retained earnings | $ (531,000) | $ (531,000)

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