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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | $ 2,896,442 | $ 2,979,547
Securities Held to Maturity, Gross Unrealized Gains | 19,466 | 5,782
Securities Held to Maturity, Gross Unrealized Losses | 22,998 | 49,473
Securities Held to Maturity, Fair Value | 2,892,910 | 2,935,856
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 | 317 | 478
Securities Held to Maturity, Fair Value | 49,683 | 49,522
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 676,651 | 688,201
Securities Held to Maturity, Gross Unrealized Gains | 11,247 | 2,347
Securities Held to Maturity, Gross Unrealized Losses | 1,726 | 9,503
Securities Held to Maturity, Fair Value | 686,172 | 681,045
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 613,964 | 640,393
Securities Held to Maturity, Gross Unrealized Gains | 3,701 | 1,461
Securities Held to Maturity, Gross Unrealized Losses | 3,148 | 6,117
Securities Held to Maturity, Fair Value | 614,517 | 635,737
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 356,919 | 357,175
Securities Held to Maturity, Gross Unrealized Gains | 1,233 | 376
Securities Held to Maturity, Gross Unrealized Losses | 3,780 | 10,882
Securities Held to Maturity, Fair Value | 354,372 | 346,669
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Amortized Cost | 1,198,908 | 1,243,778
Securities Held to Maturity, Gross Unrealized Gains | 3,285 | 1,598
Securities Held to Maturity, Gross Unrealized Losses | 14,027 | 22,493
Securities Held to Maturity, Fair Value | $ 1,188,166 | $ 1,222,883

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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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