Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 56,044	$ 934,207
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	133	5,194
Held to maturity, Losses 12 months or longer, Fair Value	324,952	419,483
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	3,225	10,647
Held to maturity, Total, Fair Value	380,996	1,353,690
Held to maturity, Total, Gross Unrealized Losses	3,358	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	47,173	22,652
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	118	301
Held to maturity, Losses 12 months or longer, Fair Value	10,792	48,727
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	312	865
Held to maturity, Total, Fair Value	57,965	71,379
Held to maturity, Total, Gross Unrealized Losses	430	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	8,871	516,330
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	15	2,894
Held to maturity, Losses 12 months or longer, Fair Value	314,160	370,756
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	2,913	9,782
Held to maturity, Total, Fair Value	323,031	887,086
Held to maturity, Total, Gross Unrealized Losses	$ 2,928	$ 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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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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-Section 50
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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