Investment Securities - Schedule of Securities with Gross Unrealized Losses (Detail) (Debt securities, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses	$ 39	$ 1,342
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	7,500	68,786
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	1,460	100
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	51,328	7,189
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	1,499	1,442
Securities available for sale - Continuous unrealized loss position - Fair value	58,828	75,975
Agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale - Continuous unrealized loss position, less than 12 months - Gross unrealized losses	38	1,337
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	7,357	68,456
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	1,456	89
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	51,094	6,142
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	1,494	1,426
Securities available for sale - Continuous unrealized loss position - Fair value	58,451	74,598
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	5
Securities available for sale - Continuous unrealized loss position, less than 12 months - Fair value	143	330
Securities available for sale - Continuous unrealized loss position, over 12 months - Gross unrealized losses	4	11
Securities available for sale - Continuous unrealized loss position, over 12 months - Fair value	234	1,047
Securities available for sale - Continuous unrealized loss - Gross unrealized losses	5	16
Securities available for sale - Continuous unrealized loss position - Fair value	$ 377	$ 1,377