Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Common shares purchased and retired (in shares)	607		896		39,360	22,596
Common shares issued (in shares)	4,356,498		11,389		4,356,498	11,389
Non-vested common shares issued (in shares)	11,136				211,164	204,991
Non-vested common shares forfeited (in shares)	16,032		10,566		21,417	27,147
stock options exercised (in shares)	41,704		60,852		98,686	127,998
Shares tendered (in shares)	16,104		4,260		35,108	24,729
Common dividends (in dollars per share)	$ 0.31	$ 0.28	$ 0.56	$ 0.62