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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Total available-for-sale debt securities, Amortized Cost, Less than one year | $ 36,678 |
Total available-for-sale debt securities, Amortized Cost, 1-5 years | 126,232 |
Total available-for-sale debt securities, Amortized Cost, 5-10 years | 450,732 |
Total available-for-sale debt securities, Amortized Cost, Over 10 years | 2,261,134 |
Available-for-sale, Amortized Cost | 2,874,776 | $ 3,019,695
Total held-to-maturity debt securities, Amortized Cost, Less than one year | 25,985 |
Total held-to-maturity debt securities, Amortized Cost, 1-5 years | 102,383 |
Total held-to-maturity debt securities, Amortized Cost, 5-10 years | 379,069 |
Total held-to-maturity debt securities, Amortized Cost, Over 10 years | 741,192 |
Held-to-maturity, Amortized Cost | 1,248,629 | 1,004,823
Total debt securities, Amortized Cost | 4,123,405 |
Total available-for-sale debt securities, Fair Value, Less than one year | 36,281 |
Total available-for-sale debt securities, Fair Value, 1-5 years | 122,389 |
Total available-for-sale debt securities, Fair Value, 5-10 years | 428,661 |
Total available-for-sale debt securities, Fair Value, Over 10 years | 1,941,809 |
Total available-for-sale debt securities, Fair Value | 2,529,140 | 3,013,462
Total held-to-maturity debt securities, Fair Value, Less than one year | 25,871 |
Total held-to-maturity debt securities, Fair Value, 1-5 years | 101,156 |
Total held-to-maturity debt securities, Fair Value, 5-10 years | 352,338 |
Total held-to-maturity debt securities, Fair Value, Over 10 years | 605,025 |
Total held-to-maturity debt securities, Fair Value | 1,084,390 | 1,028,452
Total debt securities, Fair Value | $ 3,613,530 | $ 4,041,914

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