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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 2,488,088 | $ 1,565,751
Securities Held to Maturity, Gross Unrealized Gains | 8,019 | 68,124
Securities Held to Maturity, Gross Unrealized Losses | 67,058 | 2,393
Securities Held to Maturity, Fair Value | 2,429,049 | 1,631,482
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 368,334 | 14,857
Securities Held to Maturity, Gross Unrealized Losses | 14,745 | 20
Securities Held to Maturity, Fair Value | 353,589 | 14,837
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 696,275 | 621,405
Securities Held to Maturity, Gross Unrealized Gains | 5,986 | 37,941
Securities Held to Maturity, Gross Unrealized Losses | 7,492 | 205
Securities Held to Maturity, Fair Value | 694,769 | 659,141
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 525,039 | 268,907
Securities Held to Maturity, Gross Unrealized Gains | 211 | 682
Securities Held to Maturity, Gross Unrealized Losses | 23,814 | 1,499
Securities Held to Maturity, Fair Value | 501,436 | 268,090
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 836,060 | 603,156
Securities Held to Maturity, Gross Unrealized Gains | 1,775 | 28,679
Securities Held to Maturity, Gross Unrealized Losses | 19,998 | 669
Securities Held to Maturity, Fair Value | 817,837 | 631,166
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 62,380 | 57,426
Securities Held to Maturity, Gross Unrealized Gains | 47 | 822
Securities Held to Maturity, Gross Unrealized Losses | 1,009 |
Securities Held to Maturity, Fair Value | $ 61,418 | $ 58,248

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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=123581744&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=123581744&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=123581744&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=123581744&loc=SL120269820-111563 + Details
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