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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Total available-for-sale securities, Fair value, | $ 2,909,372 | $ 3,151,133
Collateralized Loan Obligations |  |
Assets |  |
Total available-for-sale securities, Fair value, | 240,614 | 241,321
Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,909,372 | 3,151,133
Other assets | 30,956 | 16,321
Liabilities |  |
Other liabilities | (28,020) | (50,119)
Total |  |
Net Assets (Liabilities) | 2,912,308 | 3,117,335
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Other assets | 2,257 | 5,376
Total |  |
Net Assets (Liabilities) | 2,257 | 5,376
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 2,909,372 | 3,151,133
Other assets | 28,699 | 10,945
Liabilities |  |
Other liabilities | (26,820) | (49,268)
Total |  |
Net Assets (Liabilities) | 2,911,251 | 3,112,810
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Liabilities |  |
Other liabilities | (1,200) | (851)
Total |  |
Net Assets (Liabilities) | (1,200) | (851)
U.S. Treasury and government agency debt securities |  |
Assets |  |
Total available-for-sale securities, Fair value, | 116,885 | 150,982
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 116,885 | 150,982
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 116,885 | 150,982
Government-sponsored enterprises debt securities |  |
Assets |  |
Total available-for-sale securities, Fair value, | 44,240 | 44,301
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 44,240 | 44,301
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 44,240 | 44,301
Residential - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 57,202 | 59,723
Residential - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 57,202 | 59,723
Residential - Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 57,202 | 59,723
Residential - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,082,992 | 1,160,455
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,082,992 | 1,160,455
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 1,082,992 | 1,160,455
Commercial - Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 225,462 | 237,853
Commercial - Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 225,462 | 237,853
Commercial - Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 225,462 | 237,853
Commercial - Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 87,897 | 119,573
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 87,897 | 119,573
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 87,897 | 119,573
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 21,379 | 21,471
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 21,379 | 21,471
Government agency |  |
Assets |  |
Total available-for-sale securities, Fair value, | 605,221 | 653,322
Government agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 605,221 | 653,322
Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 605,221 | 653,322
Government-sponsored enterprises |  |
Assets |  |
Total available-for-sale securities, Fair value, | 427,480 | 462,132
Government-sponsored enterprises | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 427,480 | 462,132
Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | 427,480 | 462,132
Collateralized Loan Obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Total available-for-sale securities, Fair value, | 240,614 | 241,321
Collateralized Loan Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Total available-for-sale securities, Fair value, | $ 240,614 | $ 241,321

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