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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 1,480,494 | $ 1,568,009
Securities Held to Maturity, Gross Unrealized Gains | 82,105 | 44,103
Securities Held to Maturity, Gross Unrealized Losses | 22 | 1,108
Securities Held to Maturity, Fair Value | 1,562,577 | 1,611,004
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
Securities Held to Maturity, Gross Unrealized Gains |  | 3
Securities Held to Maturity, Fair Value |  | 50,003
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 627,185 | 641,019
Securities Held to Maturity, Gross Unrealized Gains | 29,093 | 27,146
Securities Held to Maturity, Gross Unrealized Losses | 20 | 69
Securities Held to Maturity, Fair Value | 656,258 | 668,096
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 28,236 | 29,687
Securities Held to Maturity, Gross Unrealized Gains | 1,309 | 883
Securities Held to Maturity, Fair Value | 29,545 | 30,570
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 538,865 | 539,371
Securities Held to Maturity, Gross Unrealized Gains | 41,782 | 12,474
Securities Held to Maturity, Gross Unrealized Losses |  | 581
Securities Held to Maturity, Fair Value | 580,647 | 551,264
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 286,208 | 307,932
Securities Held to Maturity, Gross Unrealized Gains | 9,921 | 3,597
Securities Held to Maturity, Gross Unrealized Losses | 2 | 458
Securities Held to Maturity, Fair Value | $ 296,127 | $ 311,071

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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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