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Allowance for Credit Losses - Accrued Interest Receivable (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Total Interest Receivable	$ 1,168,895,000	$ 1,366,158,000
Greater Than 90 Days Past Due	4,354,000	2,390,000
Allowance for Uncollectible Interest	4,467,000	$ 5,309,000
Monthly payment that is smaller than the interest accrued on the loan in that month	$ 25