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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 2,261,278 | $ 2,086,745
Securities Available for Sale, Gross Unrealized Gains | 47,664 | 20,120
Securities Available for Sale, Gross Unrealized Losses | 130 | 13,461
Securities Available for Sale, Fair Value | 2,308,812 | 2,093,404
US Treasury and Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 116 | 135
Securities Available for Sale, Gross Unrealized Losses |  | 1
Securities Available for Sale, Fair Value | 116 | 134
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 151,557 | 39,410
Securities Available for Sale, Gross Unrealized Gains | 4,735 | 235
Securities Available for Sale, Gross Unrealized Losses |  | 38
Securities Available for Sale, Fair Value | 156,292 | 39,607
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,867,063 | 1,750,168
Securities Available for Sale, Gross Unrealized Gains | 39,413 | 19,387
Securities Available for Sale, Gross Unrealized Losses | 130 | 11,182
Securities Available for Sale, Fair Value | 1,906,346 | 1,758,373
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 238,165 | 291,085
Securities Available for Sale, Gross Unrealized Gains | 3,181 | 140
Securities Available for Sale, Gross Unrealized Losses |  | 2,192
Securities Available for Sale, Fair Value | 241,346 | 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 | 877 | 2,447
Securities Available for Sale, Gross Unrealized Gains | 335 | 358
Securities Available for Sale, Gross Unrealized Losses |  | 48
Securities Available for Sale, Fair Value | $ 1,212 | $ 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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