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v3.21.2

Loans and Allowance for Credit Losses - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Proceeds from sales of loans held for sale |  |  | $ 118,805,000 | $ 73,159,000 |
Nonaccrual Loans | $ 96,536,000 |  | 96,536,000 |  | $ 87,823,000
Restructured loans | 7,500,000 |  | 7,500,000 |  | 10,800,000
Total Past Due | 16,469,463,000 |  | 16,469,463,000 |  | 16,103,651,000
Non accrual loans with no related allowance for credit losses | 91,851,000 |  | 91,851,000 |  | 42,122,000
Accrued interest on loans | 48,400,000 |  | $ 48,400,000 |  | 58,800,000
Number of reasonable and supportable forecast period |  |  | 1 year |  |
Commitments to lend to borrowers with loan modifications classified as TDR's | $ 0 | $ 0 | $ 0 | 0 |
Number of Contracts | 0 |  | 0 |  |
Default payment of troubled restructuring | $ 0 | $ 0 | $ 0 | $ 0 |
Real Estate Residential [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Number of Contracts |  | 0 |  | 1 |
Default payment of troubled restructuring |  |  |  | $ 441,000 |
Minimum [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Number of reasonable and supportable forecast period |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Number of reasonable and supportable forecast period |  |  | 3 years |  |
Individually Evaluated Loans and Collateral Dependent Assets [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans associated allowance |  |  | $ 2,700,000 |  | 600,000
Greater than 90 days Past Due and Accruing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total Past Due | $ 2,319,000 |  | 2,319,000 |  | $ 1,952,000
Consumer Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Proceeds from sales of loans held for sale |  |  | $ 118,800,000 | $ 73,200,000 |

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