Loans and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Proceeds from sales of loans held for sale			$ 22,267,000	$ 88,609,000
Nonaccrual Loans	$ 18,117,000		18,117,000		$ 92,300,000
Restructured loans	11,200,000		11,200,000		7,300,000
Total Past Due	18,972,158,000		18,972,158,000		17,170,871,000
Non accrual loans with no related allowance for credit losses	18,117,000		18,117,000		85,948,000
Accrued interest on loans	52,100,000		$ 52,100,000		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
Default payment of troubled restructuring	0	$ 0	0	$ 0
Commercial Real Estate Portfolio Segment
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual Loans	2,600,000		2,600,000		4,688,000
Total Past Due	6,725,833,000		6,725,833,000		6,267,544,000
Non accrual loans with no related allowance for credit losses	$ 2,600,000		$ 2,600,000		4,688,000
Number of Contracts	2		2
Default payment of troubled restructuring, pre-modification	$ 5,100		$ 5,100
Default payment of troubled restructuring, post-modification	4,300		$ 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	3,446,000		$ 3,446,000		$ 2,633,000
Greater than 90 days Past Due and Accruing [Member] | Commercial Real Estate Portfolio Segment
Financing Receivable Allowance For Credit Losses [Line Items]
Total Past Due	$ 100,000		100,000
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			$ 22,300,000	$ 88,600,000