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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Sale Price	$ 680,466	$ 17,837	$ 256,996
Book Value	672,192	17,837	250,100
Available-For-Sale Securities, Gross Realized Gains	8,274	0	6,896
Available-For-Sale, Securities Gross Realized Losses	0	0	0
Securities Investment [Member]
Investments, Debt and Equity Securities [Abstract]
Book Value			84,100
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price	451,081		107,510
Book Value	447,305		102,311
Available-For-Sale Securities, Gross Realized Gains	3,776		5,199
Available-For-Sale, Securities Gross Realized Losses	0		0
GNMA [Member]
Investments, Debt and Equity Securities [Abstract]
Book Value		17,800	166,000
GNMA [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price	229,385	17,837	65,284
Book Value	224,887	17,837	63,704
Available-For-Sale Securities, Gross Realized Gains	4,498	0	1,580
Available-For-Sale, Securities Gross Realized Losses	$ 0	$ 0	0
US Treasury Securities [Member] | Securities Investment [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price			84,202
Book Value			84,085
Available-For-Sale Securities, Gross Realized Gains			117
Available-For-Sale, Securities Gross Realized Losses			$ 0

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

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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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