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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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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

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- Definition 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. + 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 -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 + Details
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