Debt and Equity Securities (Composition of Company's Non-Agency Mortgage-Backed Securities) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013 Security
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	6
Amortized Cost	$ 24,085
Estimated Fair Value	20,303
External Credit Rating, Non Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Non-Investment Grade/Not Rated	100.00%
Prime Single Family Residential Two Thousand Seven
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	4,010
Estimated Fair Value	3,005
Prime Single Family Residential Two Thousand Seven | External Credit Rating, Non Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Non-Investment Grade/Not Rated	100.00%
Prime Single Family Residential Two Thousand Six
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	3
Amortized Cost	10,629
Estimated Fair Value	8,743
Prime Single Family Residential Two Thousand Six | External Credit Rating, Non Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Non-Investment Grade/Not Rated	100.00%
Prime Single Family Residential Two Thousand Five
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	1,446
Estimated Fair Value	1,399
Prime Single Family Residential Two Thousand Five | External Credit Rating, Non Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Non-Investment Grade/Not Rated	100.00%
Single Family Residential Two Thousand Seven
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	8,000
Estimated Fair Value	$ 7,156
Single Family Residential Two Thousand Seven | External Credit Rating, Non Investment Grade
Schedule Of Available For Sale Securities [Line Items]
Non-Investment Grade/Not Rated	100.00%