Investment Securities, at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Commercial mortgage backed securities, maturities, amortized cost basis
Available-for-sale Securities, Amortized Cost Basis	$ 210,681		$ 62,041
Commercial mortgage backed securities, maturities, fair value
Investment securities, at fair value	213,803	[1]	62,067	[1]	61,604
Available-for-sale Securities, Gross Unrealized Gain	3,589		498
Available-for-sale Securities, Gross Unrealized Loss	(467)		(472)
Investment securities, at fair value	213,803	[1]	62,067	[1]	61,604
Securities Assets [Member]
Commercial mortgage backed securities, maturities, amortized cost basis
Available-for-sale Securities, Amortized Cost Basis	1,605		1,589
Commercial mortgage backed securities, maturities, fair value
Investment securities, at fair value	1,648		1,484
Available-for-sale Securities, Gross Unrealized Gain	43		0
Available-for-sale Securities, Gross Unrealized Loss	0		(105)
Investment securities, at fair value	1,648		1,484
Commercial Mortgage Backed Securities [Member]
Commercial mortgage backed securities, maturities, amortized cost basis
Due within one year	0
Due after one year through five years	1,325
Due after five years through 10 years	178,885
Due after 10 years	28,866
Amortized cost basis, total	209,076
Available-for-sale Securities, Amortized Cost Basis	209,076		60,452
Commercial mortgage backed securities, maturities, fair value
Due within one year	0
Due after one year through five years	1,348
Due after five years through 10 years	181,055
Due after 10 years	29,752
Investment securities, at fair value	212,155		60,583
Available-for-sale Securities, Gross Unrealized Gain	3,546		498
Available-for-sale Securities, Gross Unrealized Loss	(467)		(367)
Investment securities, at fair value	$ 212,155		$ 60,583

[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Financial Statements.