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Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 10,087,179 | $ 5,470,523
Gross Unrealized Gains | 51,025 | 96,596
Gross Unrealized Losses | (172,851) | (22,461)
Fair Value | 9,965,353 | 5,544,658
Debt securities available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest receivables | 33,100 | 22,300
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,049,238 | 50,310
Gross Unrealized Gains | 130 | 451
Gross Unrealized Losses | (16,687) | 0
Fair Value | 1,032,681 | 50,761
U.S. government agency and U.S. government-sponsored enterprise debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,333,984 | 806,814
Gross Unrealized Gains | 2,697 | 8,765
Gross Unrealized Losses | (34,710) | (1,260)
Fair Value | 1,301,971 | 814,319
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,242,043 | 1,125,174
Gross Unrealized Gains | 15,791 | 34,306
Gross Unrealized Losses | (28,854) | (5,710)
Fair Value | 1,228,980 | 1,153,770
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,968,789 | 1,634,553
Gross Unrealized Gains | 8,629 | 27,952
Gross Unrealized Losses | (49,135) | (1,611)
Fair Value | 2,928,283 | 1,660,894
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 519,381 | 382,573
Gross Unrealized Gains | 10,065 | 13,588
Gross Unrealized Losses | (6,288) | (88)
Fair Value | 523,158 | 396,073
Non-agency commercial mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 498,920 | 234,965
Gross Unrealized Gains | 3,000 | 6,107
Gross Unrealized Losses | (5,477) | (1,230)
Fair Value | 496,443 | 239,842
Non-agency residential mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 889,937 | 288,520
Gross Unrealized Gains | 971 | 1,761
Gross Unrealized Losses | (8,977) | (506)
Fair Value | 881,931 | 289,775
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 657,516 | 406,323
Gross Unrealized Gains | 8,738 | 3,493
Gross Unrealized Losses | (16,589) | (3,848)
Fair Value | 649,665 | 405,968
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 260,447 | 183,828
Gross Unrealized Gains | 767 | 163
Gross Unrealized Losses | (3,481) | (1,460)
Fair Value | 257,733 | 182,531
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 74,674 | 63,463
Gross Unrealized Gains | 185 | 10
Gross Unrealized Losses | (301) | (242)
Fair Value | 74,558 | 63,231
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 592,250 | 294,000
Gross Unrealized Gains | 52 | 0
Gross Unrealized Losses | (2,352) | (6,506)
Fair Value | $ 589,950 | $ 287,494

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