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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | $ 2,500,220 | $ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains | 7,896 | 21,304
Securities Held to Maturity, Gross Unrealized Losses | 37,999 | 15,841
Securities Held to Maturity, Fair Value | 2,470,117 | 2,375,851
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 | 44 | 410
Securities Held to Maturity, Fair Value | 49,956 | 49,590
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 648,093 | 185,890
Securities Held to Maturity, Gross Unrealized Gains | 2,147 | 3,475
Securities Held to Maturity, Gross Unrealized Losses | 20,175 | 1,166
Securities Held to Maturity, Fair Value | 630,065 | 188,199
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 862,162 | 1,014,135
Securities Held to Maturity, Gross Unrealized Gains | 4,329 | 15,585
Securities Held to Maturity, Gross Unrealized Losses | 3,068 | 1,589
Securities Held to Maturity, Fair Value | 863,423 | 1,028,131
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 75,739 |
Securities Held to Maturity, Gross Unrealized Losses | 4,038 |
Securities Held to Maturity, Fair Value | 71,701 |
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 864,226 | 1,120,363
Securities Held to Maturity, Gross Unrealized Gains | 1,420 | 2,244
Securities Held to Maturity, Gross Unrealized Losses | 10,674 | 12,676
Securities Held to Maturity, Fair Value | $ 854,972 | $ 1,109,931

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- Definition Amount after other than temporary impairment (OTTI) accretion, 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 (a) -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 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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