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Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Equity securities, fair value	$ 488,000	$ 488,000	$ 506,000
Equity securities sold	0	0
Available-for-sale Securities Pledged as Collateral	$ 240,070,000	$ 240,070,000	$ 141,465,000
Debt Securities, Available-for-sale, Restriction Type [Extensible List]	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember	us-gaap:CollateralPledgedMember
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity securities, fair value	$ 488,000	$ 488,000	$ 506,000
Accumulated Other Comprehensive Loss [Member] | Equity Securities [Member]
Schedule of Investments [Line Items]
Net unrealized gains recongized			$ 44,000,000

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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