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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities: |  |
Available-for-sale: |  |
Amount Outstanding | $ 3,786,758 | $ 3,826,582
Unamortized Premium/(Discount) | 0 | 0
Amortized Cost | 3,800,537 | 3,843,666
Allowance for losses | (61) | (36)
Unrealized Gains | 12,635 | 13,642
Unrealized Losses | (3,479) | (3,580)
Fair Value | 3,809,632 | 3,853,692
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total held-to-maturity |  |
Amount Outstanding | 45,032 | 45,032
Unamortized Premium/(Discount) | 0 | 0
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 | 0
Unrealized Gains | 1,552 | 1,201
Unrealized Losses | 0 | 0
Fair Value | 46,584 | 46,233
Accrued interest excluded | 6,400 | 9,000
Available-for-Sale Securities | Investment securities: |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 13,779 | 17,084
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 13,779 | 17,084
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 13,779 | 17,084
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Available-for-sale: |  |
Amount Outstanding | 19,700 | 19,700
Amortized Cost | 19,700 | 19,700
Allowance for losses | (61) | (36)
Unrealized Gains | 0 | 0
Unrealized Losses | (493) | (493)
Fair Value | 19,146 | 19,171
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding |  | 6,232
Amortized Cost |  | 6,232
Allowance for losses |  | 0
Unrealized Gains |  | 0
Unrealized Losses |  | (1)
Fair Value |  | 6,231
Floating Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,378,471 | 2,350,963
Amortized Cost | 2,378,436 | 2,350,919
Allowance for losses | 0 | 0
Unrealized Gains | 12,059 | 12,150
Unrealized Losses | (2,937) | (3,043)
Fair Value | 2,387,558 | 2,360,026
Floating Interest Rate | Available-for-Sale Securities | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 0 | 0
Floating Interest Rate | Available-for-Sale Securities | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) |  | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) |  | 0
Total held-to-maturity |  |
Unamortized Premium/(Discount) |  | 0
Floating Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (35) | (44)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (35) | (44)
Total held-to-maturity |  |
Unamortized Premium/(Discount) | (35) | (44)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 179 | 279
Amortized Cost | 179 | 279
Allowance for losses | 0 | 0
Unrealized Gains | 22 | 34
Unrealized Losses | 0 | 0
Fair Value | 201 | 313
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 | 0
Unrealized Gains | 1,552 | 1,201
Unrealized Losses | 0 | 0
Fair Value | $ 46,584 | $ 46,233
Total held-to-maturity |  |
Held-to-maturity investment securities weighted average yield | 1.50% | 1.50%
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,388,408 | $ 1,449,408
Amortized Cost | 1,402,222 | 1,466,536
Allowance for losses | 0 | 0
Unrealized Gains | 554 | 1,458
Unrealized Losses | (49) | (43)
Fair Value | 1,402,727 | 1,467,951
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 0 | 0
Fixed Interest Rate | Available-for-Sale Securities | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 13,814 | 17,128
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 13,814 | 17,128
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 13,814 | 17,128
Fixed Interest Rate | Held-to-Maturity Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total held-to-maturity |  |
Unamortized Premium/(Discount) | $ 0 | $ 0

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