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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | $ 186,057 | $ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 213 | 9,553
Available for Sale, Losses 12 months or longer, Fair Value | 103,507 | 150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 1,000 | 3,908
Available for Sale, Total, Fair Value | 289,564 | 1,198,688
Available for Sale, Total, Gross Unrealized Losses | $ 1,213 | 13,461
US Treasury and Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value |  |
Available for Sale, Losses less than 12 months, Gross Unrealized Losses |  |
Available for Sale, Losses 12 months or longer, Fair Value | $ 76 | 82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses |  | 1
Available for Sale, Total, Fair Value | $ 76 | 82
Available for Sale, Total, Gross Unrealized Losses |  | 1
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | $ 25,999 | 8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 43 | 38
Available for Sale, Total, Fair Value | 25,999 | 8,296
Available for Sale, Total, Gross Unrealized Losses | 43 | 38
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 160,058 | 831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 170 | 8,257
Available for Sale, Losses 12 months or longer, Fair Value | 69,703 | 116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 554 | 2,925
Available for Sale, Total, Fair Value | 229,761 | 947,282
Available for Sale, Total, Gross Unrealized Losses | 724 | 11,182
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value |  | 208,397
Available for Sale, Losses less than 12 months, Gross Unrealized Losses |  | 1,257
Available for Sale, Losses 12 months or longer, Fair Value | 32,215 | 33,138
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 419 | 935
Available for Sale, Total, Fair Value | 32,215 | 241,535
Available for Sale, Total, Gross Unrealized Losses | 419 | 2,192
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value |  | 20
Available for Sale, Losses less than 12 months, Gross Unrealized Losses |  | 1
Available for Sale, Losses 12 months or longer, Fair Value | 1,513 | 1,473
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 27 | 47
Available for Sale, Total, Fair Value | 1,513 | 1,493
Available for Sale, Total, Gross Unrealized Losses | $ 27 | $ 48

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale 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 6 -Subparagraph (a)(2) -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 + Details
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