Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Unearned ESOP Shares	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Jun. 30, 2013	$ 367,515	$ 208	$ 227,397	$ 149,990	$ (10,051)	$ (29)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,809			8,809
Stock repurchased	(20,495)	(12)	(20,483)
Stock option expense	971		971
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	1,027		1,027
ESOP shares allocated	640		243		397
Other comprehensive income (loss)	(31)					(31)
Balance at end of period at Mar. 31, 2014	358,436	196	209,155	158,799	(9,654)	(60)
Balance at beginning of period at Jun. 30, 2014	377,151	207	225,889	160,332	(9,522)	245
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,467			5,467
Stock repurchased	(5,226)	(4)	(5,222)
Exercised stock options	259		259
Stock option expense	1,010		1,010
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	1,078		1,078
ESOP shares allocated	617		220		397
Other comprehensive income (loss)	1,579					1,579
Balance at end of period at Mar. 31, 2015	$ 381,935	$ 203	$ 223,234	$ 165,799	$ (9,125)	$ 1,824