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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available for sale securities	$ 0	$ 320,984
Book Value at Sale		316,256
Gross Gains		4,728
Gross Losses		0
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available for sale securities		229,571
Book Value at Sale		227,213
Gross Gains		2,358
Gross Losses		0
GNMA [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of available for sale securities		91,413
Book Value at Sale		89,043
Gross Gains		2,370
Gross Losses		$ 0

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Amount of realized gain on 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 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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