Investment and Mortgage-backed Securities - Amortized cost of mortgage-backed securities by contractual maturity (Details 3) (Mortgage-backed securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Mortgage-backed securities
Schedule Of Marketable Securities [Line Items]
Due in one year or less	$ 800
Due in one year through five years	3,361
Due in five years through ten years	4,594
Due in more than ten years	3,154
Total	$ 11,909