Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 1,392	$ 934,207
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2	5,194
Held to maturity, Losses 12 months or longer, Fair Value	162,076	419,483
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,288	10,647
Held to maturity, Total, Fair Value	163,468	1,353,690
Held to maturity, Total, Gross Unrealized Losses	1,290	15,841
US Treasury and Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		45,590
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		410
Held to maturity, Total, Fair Value		45,590
Held to maturity, Total, Gross Unrealized Losses		410
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		22,652
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		301
Held to maturity, Losses 12 months or longer, Fair Value	12,476	48,727
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	372	865
Held to maturity, Total, Fair Value	12,476	71,379
Held to maturity, Total, Gross Unrealized Losses	372	1,166
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value		349,635
Held to maturity, Losses less than 12 months, Gross Unrealized Losses		1,589
Held to maturity, Total, Fair Value		349,635
Held to maturity, Total, Gross Unrealized Losses		1,589
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	1,392	516,330
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2	2,894
Held to maturity, Losses 12 months or longer, Fair Value	149,600	370,756
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	916	9,782
Held to maturity, Total, Fair Value	150,992	887,086
Held to maturity, Total, Gross Unrealized Losses	$ 918	$ 12,676

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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