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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | $ 105,650,000 | $ 102,959,000
Debt Securities, Available-for-sale, Restriction Type [Extensible List] | us-gaap:CollateralPledgedMember | us-gaap:CollateralPledgedMember
Available for sale securities executed | $ 0 |
FHLB [Member] |  |
Schedule of Investments [Line Items] |  |
Letter of credit outstanding, amount | $ 263,800,000 | $ 288,950,000

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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