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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 55,063 |
Due after one year through five years | 80,038 |
Due after five years through ten years | 182,578 |
Due after ten years | 164,918 |
Total contractual maturities | 482,597 |
Available-for-sale investment securities, amortized cost | 3,673,396 | $ 8,560,733
Fair Value |  |
Due in one year or less | 54,493 |
Due after one year through five years | 76,346 |
Due after five years through ten years | 172,565 |
Due after ten years | 160,634 |
Total contractual maturities | 464,038 |
Total available-for-sale securities, Fair value, | 3,289,160 | 8,428,032
Amortized Cost |  |
Due after ten years | 108,802 |
Total contractual maturities | 108,802 |
Amortized cost | 4,406,143 |
Fair Value |  |
Due after ten years | 95,695 |
Total contractual maturities | 95,695 |
Total held to maturity, Fair value, | 3,960,713 | 0
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,868,548 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,641,461 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,344,852 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,187,629 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 68,969 |
Available-for-sale investment securities, amortized cost | 68,969 | 135,764
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 61,634 |
Total available-for-sale securities, Fair value, | 61,634 | 137,264
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 46,695 |
Amortized cost | 46,695 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 41,467 |
Total held to maturity, Fair value, | 41,467 |
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,366,912 |
Available-for-sale investment securities, amortized cost | 1,366,912 | 1,496,605
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,197,841 |
Total available-for-sale securities, Fair value, | 1,197,841 | 1,491,100
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 108,145 |
Amortized cost | 108,145 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 96,218 |
Total held to maturity, Fair value, | 96,218 |
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 290,614 |
Available-for-sale investment securities, amortized cost | 290,614 | 392,443
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 250,665 |
Total available-for-sale securities, Fair value, | 250,665 | 387,663
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,500 |
Amortized cost | 30,500 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 25,716 |
Total held to maturity, Fair value, | 25,716 |
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 142,053 |
Available-for-sale investment securities, amortized cost | 142,053 | 1,415,511
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 131,321 |
Total available-for-sale securities, Fair value, | 131,321 | 1,369,443
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,159,512 |
Amortized cost | 1,159,512 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,024,228 |
Total held to maturity, Fair value, | 1,024,228 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,322,251 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,183,661 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,952,489 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,677,389 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 769,161 |
Available-for-sale investment securities, amortized cost | 769,161 | 2,103,187
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 694,213 |
Total available-for-sale securities, Fair value, | 694,213 | 2,079,523
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,106,231 |
Amortized cost | 1,106,231 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,009,142 |
Total held to maturity, Fair value, | 1,009,142 |
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 553,090 |
Available-for-sale investment securities, amortized cost | 553,090 | 2,671,131
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 489,448 |
Total available-for-sale securities, Fair value, | 489,448 | $ 2,621,044
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,846,258 |
Amortized cost | 1,846,258 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,668,247 |
Total held to maturity, Fair value, | $ 1,668,247 |

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