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Note 3 - Loans and Allowance for Loan Losses - Acquired Portfolio and the Acquisition Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020
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
Balance	(1,465)
Accretion	102
Balance	(1,363)	$ (1,465)
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	(1,898)	(2,004)
Accretion	196	106
Balance	(1,702)	(1,898)
Acquired Impaired [Member] | Community Shores Bank Corp ("Community Shores") [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
Balance	(869)
Accretion	20
Balance	(849)	(869)
Acquired Impaired [Member] | County Bank Corp ("County") [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	(140)	(185)
Accretion	2	45
Balance	(138)	(140)
Acquired Non-Impaired [Member] | Community Shores Bank Corp ("Community Shores") [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	(596)
Accretion	82
Balance	(514)	(596)
Acquired Non-Impaired [Member] | County Bank Corp ("County") [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	(1,758)	(1,819)
Accretion	194	61
Balance	$ (1,564)	$ (1,758)

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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- 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

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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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