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Note 3 - Loans and Allowance for Loan Losses - Acquired Portfolio and the Acquisition Fair Value Adjustments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jul. 01, 2020	Oct. 01, 2019
County Bank Corp ("County") [Member]
Loans acquired - contractual payments				$ 395,123
Nonaccretable difference				(2,928)
Expected cash flows				392,195
Accretable yield				(2,079)
Carrying balance at acquisition date				390,116
Accretion	$ (233)	$ (345)
Transfer from non-accretable to accretable yield	400
Balance	1,826	1,659
Balance	1,659	2,004
County Bank Corp ("County") [Member] | Acquired Impaired [Member]
Loans acquired - contractual payments				7,729
Nonaccretable difference				(2,928)
Expected cash flows				4,801
Accretable yield				(185)
Carrying balance at acquisition date				4,616
Accretion	0	(50)
Transfer from non-accretable to accretable yield	400
Balance	535	135
Balance	135	185
County Bank Corp ("County") [Member] | Acquired Non-Impaired [Member]
Loans acquired - contractual payments				387,394
Nonaccretable difference				0
Expected cash flows				387,394
Accretable yield				(1,894)
Carrying balance at acquisition date				$ 385,500
Accretion	(233)	(295)
Transfer from non-accretable to accretable yield	0
Balance	1,291	1,524
Balance	1,524	1,819
Community Shores Bank Corp ("Community Shores") [Member]
Loans acquired - contractual payments			$ 178,986
Nonaccretable difference			(2,719)
Expected cash flows			176,267
Accretable yield			(1,465)
Carrying balance at acquisition date			174,802
Accretion	(556)	(167)
Balance	742	1,298
Balance	1,298	0
Merger		1,465
Community Shores Bank Corp ("Community Shores") [Member] | Acquired Impaired [Member]
Loans acquired - contractual payments			20,491
Nonaccretable difference			(2,719)
Expected cash flows			17,772
Accretable yield			(869)
Carrying balance at acquisition date			16,903
Accretion	(298)	(26)
Balance	545	843
Balance	843	0
Merger		869
Community Shores Bank Corp ("Community Shores") [Member] | Acquired Non-Impaired [Member]
Loans acquired - contractual payments			158,495
Nonaccretable difference			0
Expected cash flows			158,495
Accretable yield			(596)
Carrying balance at acquisition date			$ 157,899
Accretion	(258)	(141)
Balance	197	455
Balance	$ 455	0
Merger		$ 596

X

- Definition

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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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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-Topic 310
-SubTopic 30
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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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