Note 2 - Securities - Cost of Restricted Stock (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Total restricted stock	$ 8,024	$ 8,715
FRB Stock [Member]
Total restricted stock	6,468	6,458
FHLB Stock [Member]
Total restricted stock	$ 1,556	$ 2,257

The cost of the restricted investment.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Footnote 11(a)(3)))
-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.6(a)(3))
-URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611133-123010

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant