Debt and Equity Securities (Composition of Company's Non-Agency Mortgage-Backed Securities) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Security
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	6
Amortized Cost	$ 19,658
Estimated Fair Value	19,022
Prime Single Family Residential Two Thousand Seven
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	3,552
Estimated Fair Value	2,873
Prime Single Family Residential Two Thousand Six
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	3
Amortized Cost	9,389
Estimated Fair Value	8,275
Prime Single Family Residential Two Thousand Five
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	948
Estimated Fair Value	938
Single Family Residential Two Thousand Seven
Schedule Of Available For Sale Securities [Line Items]
Number of Securities	1
Amortized Cost	5,769
Estimated Fair Value	$ 6,936