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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
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