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