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Allowance for Loans Losses - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Purchase loans		$ 13,787,000	$ 19,686,000
Bad debts recovered		263,000	211,000
Outstanding specifically impaired loans		1,027,057,000	642,262,000
Specific impairment		1,449,000	1,408,000
Gross loans		1,046,380,000	647,572,000
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans		0	0
Loss [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans		0	$ 0
Specifically impaired loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Bad debts recovered	$ 200,000			$ 200,000
Specifically impaired loans [Member] | PCI loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Outstanding specifically impaired loans		2,159,000
Specific impairment		$ 190,000

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

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-SubTopic 10
-Section 50
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Amount of increase from purchase of financing receivable.

+ References

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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