Loans and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale			$ 33,657,000	$ 118,805,000
Nonaccrual Loans	$ 19,817,000		19,817,000		$ 92,300,000
Restructured loans	5,500,000		5,500,000		7,300,000
Total Past Due	19,883,573,000		19,883,573,000		17,170,871,000
Non accrual loans with no related allowance for credit losses	17,164,000		17,164,000		85,948,000
Accrued interest on loans	66,500,000		$ 66,500,000		45,200,000
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		0
Default payment of troubled restructuring	$ 0	$ 0	0	$ 0
Commercial Real Estate Portfolio Segment
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual Loans	2,596,000		2,596,000		4,688,000
Total Past Due	7,104,217,000		7,104,217,000		6,267,544,000
Non accrual loans with no related allowance for credit losses	2,596,000		$ 2,596,000		4,688,000
Number of Contracts			2
Default payment of troubled restructuring, pre-modification			$ 5,100
Default payment of troubled restructuring, post-modification			$ 4,300
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					1,000,000.0
Greater than 90 days Past Due and Accruing [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	$ 2,513,000		$ 2,513,000		$ 2,633,000
Factoring Loan [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Sale of loan portfolio			82,600,000
Gain of sale of loan portfolio			2,400,000
Consumer Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale			$ 33,700,000	$ 118,800,000