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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Sale Price	$ 2,174	$ 320,984	$ 680,466
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Sale Price	2,175	320,984	680,466
Book Value at Sale	2,156	316,256	672,192
Gross Gains	19	4,728	8,274
Gross Losses	0	0	0
FNMA and FHLMC certificates | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
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 Securities | Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Sale Price	2,175	91,413	229,385
Book Value at Sale	2,156	89,043	224,887
Gross Gains	19	2,370	4,498
Gross Losses	$ 0	$ 0	$ 0

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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Amount of realized loss 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)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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