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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 1,357,170 | $ 1,568,009
Securities Held to Maturity, Gross Unrealized Gains | 110,413 | 44,103
Securities Held to Maturity, Gross Unrealized Losses | 2 | 1,108
Securities Held to Maturity, Fair Value | 1,467,581 | 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 | 627,019 | 641,019
Securities Held to Maturity, Gross Unrealized Gains | 51,408 | 27,146
Securities Held to Maturity, Gross Unrealized Losses | 2 | 69
Securities Held to Maturity, Fair Value | 678,425 | 668,096
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 21,951 | 29,687
Securities Held to Maturity, Gross Unrealized Gains | 1,469 | 883
Securities Held to Maturity, Fair Value | 23,420 | 30,570
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 549,686 | 539,371
Securities Held to Maturity, Gross Unrealized Gains | 54,587 | 12,474
Securities Held to Maturity, Gross Unrealized Losses |  | 581
Securities Held to Maturity, Fair Value | 604,273 | 551,264
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 158,514 | 307,932
Securities Held to Maturity, Gross Unrealized Gains | 2,949 | 3,597
Securities Held to Maturity, Gross Unrealized Losses |  | 458
Securities Held to Maturity, Fair Value | $ 161,463 | $ 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=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + 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=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + 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=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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