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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Sale Price	$ 320,984	$ 680,466
Book Value at Sale	316,256	672,192
Gross Gains	4,728	8,274
Gross Losses	0	0
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price	229,571	451,081
Book Value at Sale	227,213	447,305
Gross Gains	2,358	3,776
Gross Losses	0	0
GNMA [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price	91,413	229,385
Book Value at Sale	89,043	224,887
Gross Gains	2,370	4,498
Gross Losses	$ 0	$ 0

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- References

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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