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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 8,212 |
Due from one year to five years | 253,200 |
Due from five years to ten years | 353,124 |
Due after ten years | 1,034,967 |
Amortized cost, before securities without debt maturities | 1,649,503 |
Amortized Cost | 3,009,064 |
Estimated Fair Value |  |
Due in one year or less | 8,240 |
Due from one year to five years | 253,976 |
Due from five years to ten years | 371,026 |
Due after ten years | 1,084,411 |
Available for sale securities, debt maturities, before securities without single maturities | 1,717,653 |
Estimated Fair Value | 3,097,375 | $ 3,062,143
Amortized Cost |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 0 |
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total | 0 |
Amortized Cost, Held to Maturity | 824,283 | 278,281
Estimated Fair Value |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 0 |
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value | 0 |
Estimated Fair Value, Held to Maturity | 826,932 |
Mortgage-Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 201,654 |
Amortized Cost | 201,654 | 373,779
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 201,547 |
Estimated Fair Value | 201,547 | 377,998
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 439,220 |
Amortized Cost, Held to Maturity | 439,220 | 278,281
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 449,671 |
Estimated Fair Value, Held to Maturity | 449,671 | 296,857
Commercial Mortgage Backed Securities [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 858,574 |
Amortized Cost | 858,574 | 741,172
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 871,010 |
Estimated Fair Value | 871,010 | 762,415
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 385,063 |
Amortized Cost, Held to Maturity | 385,063 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | 377,261 |
Estimated Fair Value, Held to Maturity | 377,261 |
Collateralized Mortgage Obligations [Member] |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 299,333 |
Amortized Cost | 299,333 | 491,321
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 307,165 |
Estimated Fair Value | 307,165 | $ 503,766
Amortized Cost |  |
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost | 0 |
Estimated Fair Value |  |
Debt securities, held-to-maturity, maturity, without single maturity date, fair value | $ 0 |

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