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Premium on Debt Securities - Additional Information (Details) - Accounting Standards Update 2017-08 [Member] - USD ($)	Jul. 01, 2018	Jun. 30, 2018
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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