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Consolidated Statements of Changes in Shareholders’ Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Dividends per share (in usd per share)	$ 0.15	$ 0.13	$ 0.30	$ 0.25
Issuance of stock to acquire Hamilton Bancorp, Inc. (in shares)	1,765,704		1,765,704
Issuance of stock, common stock forfeited (in shares)			26,480	300
Compensation expense, issuance of stock	$ 180	$ 444	$ 679	$ 924
Stock-based compensation plans, issuance of stock (in shares)	0	0	19,034	75,623
Issuance of treasury stock (in shares)		11,317	9,031
Treasury stock, shares acquired (in shares)				21,965

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