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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, 2020	Dec. 31, 2019	Jul. 01, 2020	Oct. 01, 2019
Balance	$ 0
Balance		$ 0
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	2,004	0
Merger with County Bank Corp on October 1, 2019		2,079
Accretion October 1, 2019 through December 31, 2019	(345)	(75)
Balance	1,659	2,004
Merger with Community Shores Bank Corporation on July 1, 2020		2,079
Accretion	(345)	(75)
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	185	0
Merger with County Bank Corp on October 1, 2019		185
Accretion October 1, 2019 through December 31, 2019	(50)	0
Balance	135	185
Merger with Community Shores Bank Corporation on July 1, 2020		185
Accretion	(50)	0
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	1,819	0
Merger with County Bank Corp on October 1, 2019		1,894
Accretion October 1, 2019 through December 31, 2019	(295)	(75)
Balance	1,524	1,819
Merger with Community Shores Bank Corporation on July 1, 2020		1,894
Accretion	(295)	$ (75)
Community Shores Bank Corp ("Community Shores") [Member]
Loans acquired - contractual payments			$ 178,986
Nonaccretable difference			(3,547)
Expected cash flows			175,439
Accretable yield			(1,465)
Carrying balance at acquisition date			173,974
Merger with County Bank Corp on October 1, 2019	1,465
Accretion October 1, 2019 through December 31, 2019	(167)
Balance	1,298
Merger with Community Shores Bank Corporation on July 1, 2020	1,465
Accretion	(167)
Community Shores Bank Corp ("Community Shores") [Member] | Acquired Impaired [Member]
Loans acquired - contractual payments			20,491
Nonaccretable difference			(3,547)
Expected cash flows			16,944
Accretable yield			(869)
Carrying balance at acquisition date			16,075
Merger with County Bank Corp on October 1, 2019	869
Accretion October 1, 2019 through December 31, 2019	(26)
Balance	843
Merger with Community Shores Bank Corporation on July 1, 2020	869
Accretion	(26)
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
Merger with County Bank Corp on October 1, 2019	596
Accretion October 1, 2019 through December 31, 2019	(141)
Balance	455
Merger with Community Shores Bank Corporation on July 1, 2020	596
Accretion	$ (141)

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.

+ References

No definition available.

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
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- Definition

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.

+ References

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-Topic 310
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- Definition

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 cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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-Publisher FASB
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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.

+ References

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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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