Annual report pursuant to Section 13 and 15(d)

Loans Receivable - Summary of Loans by Class Modified as Troubled Debt Restructurings (Detail)

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Loans Receivable - Summary of Loans by Class Modified as Troubled Debt Restructurings (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Loan
Dec. 31, 2019
USD ($)
Loan
Dec. 31, 2018
USD ($)
Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | Loan 5 8 2
Pre- Modification Outstanding Recorded Investment $ 4,479 $ 54,071 $ 684
Post- Modification Outstanding Recorded Investment $ 3,676 $ 54,892 $ 664
Real Estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | Loan 5 6  
Pre- Modification Outstanding Recorded Investment $ 4,479 $ 41,292  
Post- Modification Outstanding Recorded Investment $ 3,676 $ 42,329  
Commercial and Industrial Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Loans | Loan   2 2
Pre- Modification Outstanding Recorded Investment   $ 12,779 $ 684
Post- Modification Outstanding Recorded Investment   $ 12,562 $ 664