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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Total available-for-sale securities, Fair value, | $ 8,428,032 | $ 6,071,415
Collateralized Loan Obligations [Member] |  |
Assets |  |
Total available-for-sale securities, Fair value, | 105,247 |
Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 8,428,032 | 6,071,415
Other assets | 58,307 | 141,586
Liabilities |  |
Other liabilities | (6,768) | (5,837)
Total |  |
Net Assets (Liabilities) | 8,479,571 | 6,207,164
Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] |  |
Assets |  |
Total available-for-sale securities, Fair value, | 105,247 |
Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Other assets | 7,382 | 11,691
Total |  |
Net Assets (Liabilities) | 7,382 | 11,691
Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 8,428,032 | 6,071,415
Other assets | 50,925 | 129,895
Liabilities |  |
Other liabilities | (1,238) | (1,283)
Total |  |
Net Assets (Liabilities) | 8,477,719 | 6,200,027
Fair Value, Measurements, Recurring | Level 2 | Collateralized Loan Obligations [Member] |  |
Assets |  |
Total available-for-sale securities, Fair value, | 105,247 |
Fair Value, Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (5,530) | (4,554)
Total |  |
Net Assets (Liabilities) | (5,530) | (4,554)
U.S. Treasury securities |  |
Assets |  |
Total available-for-sale securities, Fair value, | 192,563 | 171,421
U.S. Treasury securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 192,563 | 171,421
U.S. Treasury securities | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 192,563 | 171,421
Residential - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 137,264 | 160,462
Residential - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 137,264 | 160,462
Residential - Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 137,264 | 160,462
Residential - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,491,100 | 447,200
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,491,100 | 447,200
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,491,100 | 447,200
Commercial - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 387,663 | 599,650
Commercial - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 387,663 | 599,650
Commercial - Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 387,663 | 599,650
Commercial - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,369,443 | 932,157
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,369,443 | 932,157
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,369,443 | 932,157
Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,079,523 | 1,933,553
Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,079,523 | 1,933,553
Government agency | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,079,523 | 1,933,553
Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,621,044 | 1,826,972
Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,621,044 | 1,826,972
Government-sponsored enterprises | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,621,044 | $ 1,826,972
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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