Note 2 - Sales/Mergers/Acquisitions - Consideration Paid and Goodwill (Details) - USD ($) $ in Thousands			12 Months Ended
	Jul. 01, 2018	Jun. 29, 2018	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Oct. 01, 2017
ASSETS
Cash and due from banks			$ 4,651
Interest-bearing deposits at financial institutions			62,924
Securities			4,845
Loans/leases receivable, net			477,337
Bank-owned life insurance			7,092
Premises and equipment			6,092
Restricted investment securities			3,654
Intangibles			10,064
Other assets			2,255
Total assets acquired			578,914
LIABILITIES
Deposits			439,579
FHLB advances			74,540
Other borrowings			9,544
Other liabilities			8,878
Total liabilities assumed			533,684
Net assets acquired			45,230
Consideration paid:
Cash			9,834
Common stock			81,637
Total consideration paid			94,971
Goodwill			77,832	$ 74,066	$ 74,748	$ 28,334
Guaranty Bank and Trust Company
LIABILITIES
Junior subordinated debentures							$ 3,900
Springfield Bancshares
ASSETS
Cash and due from banks	$ 4,586
Interest-bearing deposits at financial institutions	62,924
Securities	4,845
Loans/leases receivable, net	477,337
Bank-owned life insurance	7,092
Premises and equipment	6,092
Restricted investment securities	3,654
Intangibles	8,209
Other assets	1,471
Total assets acquired	576,210
LIABILITIES
Deposits	439,579
Short-term borrowings	1,143
FHLB advances	74,539
Other borrowings	9,544
Other liabilities	8,409
Total liabilities assumed	533,214
Net assets acquired	42,996
Consideration paid:
Cash	8,334		$ 3,700
Common stock	80,637	$ 80,600
Total consideration paid	88,971	$ 89,000
Goodwill	$ 45,975