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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | $ 3,014,428 | $ 2,977,511
Securities Held to Maturity, Gross Unrealized Gains | 2,427 | 13,110
Securities Held to Maturity, Gross Unrealized Losses | 64,560 | 28,611
Securities Held to Maturity, Fair Value | 2,952,295 | 2,962,010
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 | 576 | 289
Securities Held to Maturity, Fair Value | 49,424 | 49,711
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 707,581 | 723,094
Securities Held to Maturity, Gross Unrealized Gains | 1,315 | 8,323
Securities Held to Maturity, Gross Unrealized Losses | 13,453 | 4,245
Securities Held to Maturity, Fair Value | 695,443 | 727,172
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 695,655 | 725,748
Securities Held to Maturity, Gross Unrealized Gains | 721 | 4,175
Securities Held to Maturity, Gross Unrealized Losses | 10,624 | 2,690
Securities Held to Maturity, Fair Value | 685,752 | 727,233
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 316,966 | 317,185
Securities Held to Maturity, Gross Unrealized Gains |  | 40
Securities Held to Maturity, Gross Unrealized Losses | 11,400 | 3,915
Securities Held to Maturity, Fair Value | 305,566 | 313,310
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 1,244,226 | 1,161,484
Securities Held to Maturity, Gross Unrealized Gains | 391 | 572
Securities Held to Maturity, Gross Unrealized Losses | 28,507 | 17,472
Securities Held to Maturity, Fair Value | $ 1,216,110 | $ 1,144,584

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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=82897076&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=82897076&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=82897076&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=82897076&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=82897076&loc=d3e27232-111563 + Details
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