Investment Securities - Schedule of Securities with Gross Unrealized Losses (Detail) (Debt securities, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses	$ 116	$ 39
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	32,658	7,500
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	1,632	1,460
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	50,240	51,328
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	1,748	1,499
Securities available for sale - Continuous unrealized loss position - Fair value	82,898	58,828
Agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses	115	38
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	32,523	7,357
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	1,628	1,456
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	50,022	51,094
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	1,743	1,494
Securities available for sale - Continuous unrealized loss position - Fair value	82,545	58,451
Non-agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses	1	1
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	135	143
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	4	4
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	218	234
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	5	5
Securities available for sale - Continuous unrealized loss position - Fair value	353	377
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses		0
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses		0
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value		0
Securities available for sale - Continuous unrealized loss - Gross unrealized losses		0
Securities available for sale - Continuous unrealized loss position - Fair value		$ 0