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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 8,560,733 | $ 5,985,031
Unrealized Gains | 24,595 | 97,114
Unrealized Losses | (157,296) | (10,730)
Total available-for-sale securities, Fair value, | 8,428,032 | 6,071,415
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 14,100 | 10,600
Collateralized Loan Obligations [Member] |  |
Available for sale debt securities |  |
Amortized Cost | 105,245 |
Unrealized Gains | 2 |
Total available-for-sale securities, Fair value, | 105,247 |
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 135,764 | 155,169
Unrealized Gains | 1,791 | 5,293
Unrealized Losses | (291) |
Total available-for-sale securities, Fair value, | 137,264 | 160,462
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 1,496,605 | 434,282
Unrealized Gains | 6,914 | 13,643
Unrealized Losses | (12,419) | (725)
Total available-for-sale securities, Fair value, | 1,491,100 | 447,200
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 392,443 | 583,232
Unrealized Gains | 1,741 | 16,537
Unrealized Losses | (6,521) | (119)
Total available-for-sale securities, Fair value, | 387,663 | 599,650
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 1,415,511 | 931,095
Unrealized Gains | 2,646 | 9,045
Unrealized Losses | (48,714) | (7,983)
Total available-for-sale securities, Fair value, | 1,369,443 | 932,157
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 2,103,187 | 1,902,326
Unrealized Gains | 7,768 | 32,246
Unrealized Losses | (31,432) | (1,019)
Total available-for-sale securities, Fair value, | 2,079,523 | 1,933,553
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 2,671,131 | 1,808,804
Unrealized Gains | 3,608 | 18,991
Unrealized Losses | (53,695) | (823)
Total available-for-sale securities, Fair value, | 2,621,044 | 1,826,972
Debt securities issued by states and political subdivisions |  |
Available for sale debt securities |  |
Amortized Cost | 44,185 |
Total available-for-sale securities, Fair value, | 44,185 |
U.S. Treasury securities |  |
Available for sale debt securities |  |
Amortized Cost | 196,662 | 170,123
Unrealized Gains | 125 | 1,359
Unrealized Losses | (4,224) | (61)
Total available-for-sale securities, Fair value, | $ 192,563 | $ 171,421

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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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