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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities: |  |
Available-for-sale: |  |
Amount Outstanding | $ 3,807,593 | $ 3,826,582
Unamortized Premium/(Discount) | 0 | 0
Amortized cost | 3,817,578 | 3,843,666
Allowance for losses | (58) | (36)
Unrealized Gains | 16,066 | 13,642
Unrealized Losses | (1,354) | (3,580)
Fair Value | 3,832,232 | 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 | 0 | 1,201
Unrealized Losses | (198) | 0
Fair Value | 44,834 | 46,233
Available-for-sale, accrued interest excluded | 6,200 | 9,000
Available-for-Sale Securities | Investment securities: |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 9,985 | 17,084
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 9,985 | 17,084
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 9,985 | 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 | (58) | (36)
Unrealized Gains | 0 | 0
Unrealized Losses | (394) | (493)
Fair Value | 19,248 | 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 | 2,459,511 | 2,350,963
Amortized cost | 2,459,519 | 2,350,919
Allowance for losses | 0 | 0
Unrealized Gains | 15,833 | 12,150
Unrealized Losses | (652) | (3,043)
Fair Value | 2,474,700 | 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) | 8 | (44)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 8 | (44)
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 8 | (44)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 28,174 | 279
Amortized cost | 28,981 | 279
Allowance for losses | 0 | 0
Unrealized Gains | 29 | 34
Unrealized Losses | 0 | 0
Fair Value | 29,010 | 313
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 | 0
Unrealized Gains | 0 | 1,201
Unrealized Losses | (198) | 0
Fair Value | $ 44,834 | $ 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 | $ 1,300,208 | $ 1,449,408
Amortized cost | 1,309,378 | 1,466,536
Allowance for losses | 0 | 0
Unrealized Gains | 204 | 1,458
Unrealized Losses | (308) | (43)
Fair Value | 1,309,274 | 1,467,951
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 807 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 807 | 0
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 807 | 0
Fixed Interest Rate | Available-for-Sale Securities | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 9,170 | 17,128
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 9,170 | 17,128
Total held-to-maturity |  |
Unamortized Premium/(Discount) | 9,170 | 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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