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Loans and Allowance for Loan Losses - Summary of Changes in Accretable Yield on Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Receivables [Abstract]
Balance, beginning of period	$ 7,830	$ 153	$ 123	$ 185
Additions			10,030
Accretion	(1,239)	(16)	(3,704)	(48)
Reclassification of nonaccretable difference due to improvement in expected cash flows			106
Other changes, net		0	36	0
Balance, end of period	$ 6,591	$ 137	$ 6,591	$ 137

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- Definition

Certain loans acquired in transfer not accounted for as debt securities, accretable yield, other changes, net

+ References

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- Definition

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

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Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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