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Fair Value Measurements - Quantitative Information Related to Significant Unobservable Inputs (Detail) - Fair Value Measurements, Recurring [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Discounted Cash Flows | Other Assets and Other Liabilities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Recurring fair value measurements for certain Level 3 Assets and Liabilities $ 35,666 $ 43,234
Discounted Cash Flows | Other Assets and Other Liabilities [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Commitment expirations 0.00% 0.00%
Discounted Cash Flows | Other Assets and Other Liabilities [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Commitment expirations 91.00% 98.00%
Discounted Cash Flows | Other Assets and Other Liabilities [Member] | Weighted Average [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Commitment expirations 16.00% 16.00%
Two Independent Pricing Quotes [Member] | Privately Issued Mortgage-Backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Recurring fair value measurements for certain Level 3 Assets and Liabilities   $ 16