CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Net income	$ 8,565	$ 7,718	$ 6,660	$ 6,533	$ 5,545	$ 5,275	$ 4,927	$ 4,832	$ 29,476	$ 20,579	$ 21,128
Change in unrealized loss on securities:
Net unrealized holding gains (losses) arising during the period									(7,412)	(8,326)	3,594
Income tax expense (benefit) related to items of other comprehensive income									(2,948)	(3,312)	1,477
Total other comprehensive income (loss), net of tax									(4,464)	(5,014)	2,117
Comprehensive income									$ 25,012	$ 15,565	$ 23,245