Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Stock repurchased and retired (in shares)	127,180	1,093,259
Non-vested common shares issued (in shares)	239,525	327,367
Non-vested common shares forfeited (in shares)	19,068	2,570
stock options exercised (in shares)	40,663	73,351
Shares tendered (in shares)	6,177	23,175
Common dividends (in dollars per share)	$ 0.41	$ 0.94
Accounting Standards Update [Extensible Enumeration]			us-gaap:AccountingStandardsUpdate201613Member