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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Total available-for-sale securities, Fair value, | $ 3,967,746 | $ 8,428,032
Collateralized Loan Obligations |  |
Assets |  |
Total available-for-sale securities, Fair value, | 246,703 | 105,247
Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 3,967,746 | 8,428,032
Other assets | 17,089 | 58,307
Liabilities |  |
Other liabilities | (31,647) | (6,768)
Total |  |
Net Assets (Liabilities) | 3,953,188 | 8,479,571
Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Other assets | 6,703 | 7,382
Total |  |
Net Assets (Liabilities) | 6,703 | 7,382
Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 3,967,746 | 8,428,032
Other assets | 10,386 | 50,925
Liabilities |  |
Other liabilities | (27,861) | (1,238)
Total |  |
Net Assets (Liabilities) | 3,950,271 | 8,477,719
Fair Value, Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (3,786) | (5,530)
Total |  |
Net Assets (Liabilities) | (3,786) | (5,530)
U.S. Treasury and government agency debt securities |  |
Assets |  |
Total available-for-sale securities, Fair value, | 159,165 | 192,563
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 159,165 | 192,563
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 159,165 | 192,563
Government-sponsored enterprises debt securities |  |
Assets |  |
Total available-for-sale securities, Fair value, | 19,963 |
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 19,963 |
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 19,963 |
Residential - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 67,958 | 137,264
Residential - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 67,958 | 137,264
Residential - Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 67,958 | 137,264
Residential - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,333,015 | 1,491,100
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,333,015 | 1,491,100
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,333,015 | 1,491,100
Commercial - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 267,657 | 387,663
Commercial - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 267,657 | 387,663
Commercial - Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 267,657 | 387,663
Commercial - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 141,836 | 1,369,443
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 141,836 | 1,369,443
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 141,836 | 1,369,443
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 21,550 |
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 21,550 |
Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,025,339 | 2,079,523
Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,025,339 | 2,079,523
Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,025,339 | 2,079,523
Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 684,560 | 2,621,044
Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 684,560 | 2,621,044
Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 684,560 | 2,621,044
Collateralized Loan Obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 246,703 | 105,247
Collateralized Loan Obligations | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | $ 246,703 | 105,247
Debt securities issued by states and political subdivisions |  |
Assets |  |
Total available-for-sale securities, Fair value, |  | 44,185
Debt securities issued by states and political subdivisions | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, |  | 44,185
Debt securities issued by states and political subdivisions | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, |  | $ 44,185

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