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FHLB and Other Short-Term Borrowings - Schedule of Aggregate Annual Maturities and Weighted-Average Interest Rates of FHLB Borrowing (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Bank Advances Maturities Summary [Abstract]    
2021 $ 365,002  
2022 128,050  
2023 55,000  
2025 882  
2026 and thereafter 69  
Total $ 549,003 $ 1,415,615
2021 2.44%  
2022 1.33%  
2023 1.17%  
2025 1.45%  
2026 and thereafter 2.89%  
Total 2.05%