CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Contribution to ESOP shares (shares)	22,714	30,975	36,149
Cash Dividends (in dollars per share)	$ 2.51	$ 1.00	$ 0.98