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Investment Securities - Maturity of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Investment Securities [Line Items]    
Due within 1 year, Amortized Cost $ 5,001  
Due after 1 but within 5 years, Amortized Cost 8,881  
Due after 5 but within 10 years, Amortized Cost 28,610  
Due after 10 years, Amortized Cost 0  
Debt securities gross, Amortized Cost 42,492  
Total debt securities, Amortized Cost 898,702 $ 1,045,579
Due within 1 year, Estimated Fair Value 4,997  
Due after 1 but within 5 years, Estimated Fair Value 8,654  
Due after 5 but within 10 years, Estimated Fair Value 24,622  
Due after 10 years, Estimated Fair Value 0  
Debt securities gross, Estimated Fair Value 38,273  
Debt Securities, Available-for-Sale 762,661 $ 1,041,380
Mortgage-Backed Securities [Member]    
Investment Securities [Line Items]    
Total debt securities, Amortized Cost [1] 856,210  
Debt Securities, Available-for-Sale [1] 724,388  
US Government Agencies Debt Securities [Member]    
Investment Securities [Line Items]    
Total debt securities, Amortized Cost 328,400  
Debt Securities, Available-for-Sale 275,400  
Obligations of U.S. Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Total debt securities, Amortized Cost 527,800  
Debt Securities, Available-for-Sale $ 449,000  
[1] Mortgage Backed Securities include an amortized cost of $328.4 million and a fair value of $275.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $527.8 million and a fair value of $449.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.