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Note 1 - Business Description (Details Textual) $ in Thousands	102 Months Ended
	Jan. 10, 2020	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Assets, Total		$ 3,359,576		$ 2,788,535
Loans Held for Investment and Held for Sale, Gross		2,800,000
Deposits, Total		2,611,748		2,248,938
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance		$ 421,416	$ 414,025	$ 407,690	$ 398,841	$ 393,820	$ 374,621
Number of Businesses Acquired	6
PGB Holdings Inc. [Member]
Number of Branches	3
PGB Holdings Inc. [Member] | ILLINOIS
Number of Branches	3

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