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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 2,855,062 | $ 2,979,547
Securities Held to Maturity, Gross Unrealized Gains | 67,858 | 5,782
Securities Held to Maturity, Gross Unrealized Losses | 2,564 | 49,473
Securities Held to Maturity, Fair Value | 2,920,356 | 2,935,856
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 50,000 | 50,000
Securities Held to Maturity, Gross Unrealized Losses | 46 | 478
Securities Held to Maturity, Fair Value | 49,954 | 49,522
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 647,500 | 688,201
Securities Held to Maturity, Gross Unrealized Gains | 28,613 | 2,347
Securities Held to Maturity, Gross Unrealized Losses | 95 | 9,503
Securities Held to Maturity, Fair Value | 676,018 | 681,045
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 549,929 | 640,393
Securities Held to Maturity, Gross Unrealized Gains | 9,226 | 1,461
Securities Held to Maturity, Gross Unrealized Losses | 355 | 6,117
Securities Held to Maturity, Fair Value | 558,800 | 635,737
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 539,877 | 357,175
Securities Held to Maturity, Gross Unrealized Gains | 20,099 | 376
Securities Held to Maturity, Gross Unrealized Losses | 10 | 10,882
Securities Held to Maturity, Fair Value | 559,966 | 346,669
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 1,067,756 | 1,243,778
Securities Held to Maturity, Gross Unrealized Gains | 9,920 | 1,598
Securities Held to Maturity, Gross Unrealized Losses | 2,058 | 22,493
Securities Held to Maturity, Fair Value | $ 1,075,618 | $ 1,222,883

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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