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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 2,116,271 | $ 2,086,745
Securities Available for Sale, Gross Unrealized Gains | 34,408 | 20,120
Securities Available for Sale, Gross Unrealized Losses | 1,213 | 13,461
Securities Available for Sale, Fair Value | 2,149,466 | 2,093,404
US Treasury and Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 125 | 135
Securities Available for Sale, Gross Unrealized Losses |  | 1
Securities Available for Sale, Fair Value | 125 | 134
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 87,190 | 39,410
Securities Available for Sale, Gross Unrealized Gains | 792 | 235
Securities Available for Sale, Gross Unrealized Losses | 43 | 38
Securities Available for Sale, Fair Value | 87,939 | 39,607
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,735,836 | 1,750,168
Securities Available for Sale, Gross Unrealized Gains | 30,862 | 19,387
Securities Available for Sale, Gross Unrealized Losses | 724 | 11,182
Securities Available for Sale, Fair Value | 1,765,974 | 1,758,373
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 287,171 | 291,085
Securities Available for Sale, Gross Unrealized Gains | 2,414 | 140
Securities Available for Sale, Gross Unrealized Losses | 419 | 2,192
Securities Available for Sale, Fair Value | 289,166 | 289,033
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 3,500 | 3,500
Securities Available for Sale, Fair Value | 3,500 | 3,500
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 2,449 | 2,447
Securities Available for Sale, Gross Unrealized Gains | 340 | 358
Securities Available for Sale, Gross Unrealized Losses | 27 | 48
Securities Available for Sale, Fair Value | $ 2,762 | $ 2,757

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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