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Investment Securities (Narrative) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | $ 172,084,000 | $ 214,239,000
Debt Securities, Available-for-sale, Restriction Type [Extensible List] | us-gaap:CollateralPledgedMember | us-gaap:CollateralPledgedMember
FHLB [Member] |  |
Schedule of Investments [Line Items] |  |
Letter of credit outstanding, amount | $ 155,700,000 | $ 36,850,000

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