Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash dividends declared per common share (in dollars per share)		$ 0.24	$ 0.20	$ 0.16
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares)		15,528
Issuance of shares of common stock as s result of stock options exercised (in shares)		60,127	114,100	111,423
Retained Earnings [Member]
Cash dividends declared per common share (in dollars per share)		$ 0.24	$ 0.20	$ 0.16
Common Stock [Member]
Issuance of common stock, net of issuance costs, shares (in shares)				1,215,000
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares)		23,501	13,318	20,192
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares)	242,334	1,699,414	678,670
Issuance of shares of common stock as s result of stock options exercised (in shares)		60,127		111,423
Restricted stock awards (in shares)		22,660	28,289	21,882
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares)		21,190	23,054	22,735
Common Stock [Member] | Guaranty Bank and Trust Company [Member]
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares)			138,071
Common Stock [Member] | Springfield Bancshares
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares)		106,237