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Note 3 - Loans and Allowance for Loan Losses - Acquired Portfolio and the Acquisition Fair Value Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	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
Balance	$ 1,659	$ 2,004	$ 0
Merger			2,079
Accretion	(342)	(345)	(75)
Transfer from non-accretable to accretable yield	400
Balance	1,717	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
Balance	135	185	0
Merger			185
Accretion	(247)	(50)	0
Transfer from non-accretable to accretable yield	400
Balance	288	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
Balance	1,524	1,819	0
Merger			1,894
Accretion	(95)	(295)	(75)
Transfer from non-accretable to accretable yield	0
Balance	1,429	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
Balance	1,298	0
Merger		1,465
Accretion	(579)	(167)
Balance	719	1,298	0
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
Balance	843	0
Merger		869
Accretion	(321)	(26)
Balance	522	843	0
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
Balance	455	0
Merger		596
Accretion	(258)	(141)
Balance	$ 197	$ 455	$ 0

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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- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
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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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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration 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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