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Note 3 - Loans and Allowance for Loan Losses - Acquired Portfolio and the Acquisition Fair Value Adjustments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2020	Oct. 01, 2019
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	(547)	(167)
Balance	751	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
Balance	843	0
Merger		869
Accretion	(328)	(26)
Balance	515	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
Balance	455	0
Merger		596
Accretion	(219)	(141)
Balance	236	455	0
Merger		596
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	(139)	(345)	(75)
Balance	1,520	1,659	2,004
Merger			2,079
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	(12)	(50)	0
Balance	123	135	185
Merger			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	(127)	(295)	(75)
Balance	$ 1,397	$ 1,524	1,819
Merger			$ 1,894

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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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.

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