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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 55,021 |
Due after one year through five years | 80,163 |
Due after five years through ten years | 180,105 |
Due after ten years | 164,861 |
Total contractual maturities | 480,150 |
Available-for-sale investment securities, amortized cost | 3,549,599 | $ 8,560,733
Fair Value |  |
Due in one year or less | 54,644 |
Due after one year through five years | 76,492 |
Due after five years through ten years | 170,568 |
Due after ten years | 156,371 |
Total contractual maturities | 458,075 |
Total available-for-sale securities, Fair value, | 3,151,133 | 8,428,032
Amortized Cost |  |
Due after five years through ten years | 10,208 |
Due after ten years | 97,932 |
Total contractual maturities | 108,140 |
Amortized cost | 4,320,639 |
Fair Value |  |
Due after five years through ten years | 8,932 |
Due after ten years | 85,766 |
Total contractual maturities | 94,698 |
Total held to maturity, Fair value, | 3,814,822 | 0
Mortgage-backed securities: |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,797,822 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,577,604 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,333,829 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,170,877 |
Residential - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 66,792 |
Available-for-sale investment securities, amortized cost | 66,792 | 135,764
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 59,723 |
Total available-for-sale securities, Fair value, | 59,723 | 137,264
Amortized Cost |  |
Amortized cost | 46,302 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 46,302 |
Total held to maturity, Fair value, | 40,008 |
Residential - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,317,718 |
Available-for-sale investment securities, amortized cost | 1,317,718 | 1,496,605
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,160,455 |
Total available-for-sale securities, Fair value, | 1,160,455 | 1,491,100
Amortized Cost |  |
Amortized cost | 106,534 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 106,534 |
Total held to maturity, Fair value, | 93,556 |
Commercial - Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 282,700 |
Available-for-sale investment securities, amortized cost | 282,700 | 392,443
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 237,853 |
Total available-for-sale securities, Fair value, | 237,853 | 387,663
Amortized Cost |  |
Amortized cost | 30,544 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 30,544 |
Total held to maturity, Fair value, | 25,315 |
Commercial - Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 130,612 |
Available-for-sale investment securities, amortized cost | 130,612 | 1,415,511
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 119,573 |
Total available-for-sale securities, Fair value, | 119,573 | 1,369,443
Amortized Cost |  |
Amortized cost | 1,150,449 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,150,449 |
Total held to maturity, Fair value, | 1,011,998 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,271,627 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,115,454 |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,878,670 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 2,549,247 |
Government agency |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 738,524 |
Available-for-sale investment securities, amortized cost | 738,524 | 2,103,187
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 653,322 |
Total available-for-sale securities, Fair value, | 653,322 | 2,079,523
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,080,492 |
Amortized cost | 1,080,492 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 958,114 |
Total held to maturity, Fair value, | 958,114 |
Government-sponsored enterprises |  |
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 533,103 |
Available-for-sale investment securities, amortized cost | 533,103 | 2,671,131
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 462,132 |
Total available-for-sale securities, Fair value, | 462,132 | $ 2,621,044
Amortized Cost |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,798,178 |
Amortized cost | 1,798,178 |
Fair Value |  |
Mortgaged-backed securities and collateralized mortgage obligations | 1,591,133 |
Total held to maturity, Fair value, | $ 1,591,133 |

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