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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | $ 2,977,511 | $ 2,500,220
Securities Held to Maturity, Gross Unrealized Gains | 13,110 | 7,896
Securities Held to Maturity, Gross Unrealized Losses | 28,611 | 37,999
Securities Held to Maturity, Fair Value | 2,962,010 | 2,470,117
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 50,000 | 50,000
Securities Held to Maturity, Gross Unrealized Losses | 289 | 44
Securities Held to Maturity, Fair Value | 49,711 | 49,956
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 723,094 | 648,093
Securities Held to Maturity, Gross Unrealized Gains | 8,323 | 2,147
Securities Held to Maturity, Gross Unrealized Losses | 4,245 | 20,175
Securities Held to Maturity, Fair Value | 727,172 | 630,065
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 725,748 | 862,162
Securities Held to Maturity, Gross Unrealized Gains | 4,175 | 4,329
Securities Held to Maturity, Gross Unrealized Losses | 2,690 | 3,068
Securities Held to Maturity, Fair Value | 727,233 | 863,423
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 317,185 | 75,739
Securities Held to Maturity, Gross Unrealized Gains | 40 |
Securities Held to Maturity, Gross Unrealized Losses | 3,915 | 4,038
Securities Held to Maturity, Fair Value | 313,310 | 71,701
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 1,161,484 | 864,226
Securities Held to Maturity, Gross Unrealized Gains | 572 | 1,420
Securities Held to Maturity, Gross Unrealized Losses | 17,472 | 10,674
Securities Held to Maturity, Fair Value | $ 1,144,584 | $ 854,972

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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