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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 7,994,266 | $ 5,985,031
Unrealized Gains | 45,776 | 97,114
Unrealized Losses | (86,315) | (10,730)
Fair value | 7,953,727 | 6,071,415
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 12,800 | 10,600
U.S. Treasury and government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 188,861 | 170,123
Unrealized Gains | 552 | 1,359
Unrealized Losses | (1,552) | (61)
Fair value | 187,861 | 171,421
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 95,337 | 155,169
Unrealized Gains | 2,797 | 5,293
Fair value | 98,134 | 160,462
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 1,455,375 | 434,282
Unrealized Gains | 9,944 | 13,643
Unrealized Losses | (6,441) | (725)
Fair value | 1,458,878 | 447,200
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 449,147 | 583,232
Unrealized Gains | 4,653 | 16,537
Unrealized Losses | (5,206) | (119)
Fair value | 448,594 | 599,650
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 1,337,925 | 931,095
Unrealized Gains | 4,008 | 9,045
Unrealized Losses | (40,684) | (7,983)
Fair value | 1,301,249 | 932,157
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 2,053,171 | 1,902,326
Unrealized Gains | 16,316 | 32,246
Unrealized Losses | (9,623) | (1,019)
Fair value | 2,059,864 | 1,933,553
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 2,414,450 | 1,808,804
Unrealized Gains | 7,506 | 18,991
Unrealized Losses | (22,809) | (823)
Fair value | $ 2,399,147 | $ 1,826,972

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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