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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 6,380,002 | $ 6,984,530
Securities Available for Sale, Gross Unrealized Gains | 8,696 | 109,815
Securities Available for Sale, Gross Unrealized Losses | 395,691 | 107,647
Securities Available for Sale, Fair Value | 5,993,007 | 6,986,698
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 10,037 | 420,857
Securities Available for Sale, Gross Unrealized Gains |  | 3,781
Securities Available for Sale, Gross Unrealized Losses | 406 | 5,340
Securities Available for Sale, Fair Value | 9,631 | 419,298
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 214,611 | 304,536
Securities Available for Sale, Gross Unrealized Gains | 1,542 | 13,184
Securities Available for Sale, Gross Unrealized Losses | 519 | 3,562
Securities Available for Sale, Fair Value | 215,634 | 314,158
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 2,949,998 | 3,056,763
Securities Available for Sale, Gross Unrealized Gains | 4,535 | 29,158
Securities Available for Sale, Gross Unrealized Losses | 193,111 | 50,123
Securities Available for Sale, Fair Value | 2,761,422 | 3,035,798
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 3,089,562 | 3,064,828
Securities Available for Sale, Gross Unrealized Gains | 2,587 | 61,645
Securities Available for Sale, Gross Unrealized Losses | 197,976 | 48,614
Securities Available for Sale, Fair Value | 2,894,173 | 3,077,859
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 94,294 | 119,046
Securities Available for Sale, Gross Unrealized Gains |  | 1,837
Securities Available for Sale, Gross Unrealized Losses | 3,074 |
Securities Available for Sale, Fair Value | 91,220 | 120,883
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 21,500 | 18,500
Securities Available for Sale, Gross Unrealized Gains | 32 | 210
Securities Available for Sale, Gross Unrealized Losses | 605 | 8
Securities Available for Sale, Fair Value | $ 20,927 | $ 18,702

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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