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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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