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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Sale Price	$ 191,200		$ 354,501	$ 0
Book Value	$ 349,700	$ 0	349,726	$ 0
Available-For-Sale Securities, Gross Realized Gains			4,776
Available-For-Sale, Securities Gross Realized Losses			0
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price			213,376
Book Value			211,549
Available-For-Sale Securities, Gross Realized Gains			1,827
Available-For-Sale, Securities Gross Realized Losses			0
GNMA [Member] | Collateralized Mortgage Backed Securities [Member]
Investments, Debt and Equity Securities [Abstract]
Sale Price			141,125
Book Value			138,177
Available-For-Sale Securities, Gross Realized Gains			2,949
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=109979856&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=109223946&loc=d3e3179-108585

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