Investment Securities, at Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 210,681	$ 62,041
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	62,067
Commercial mortgage backed securities, maturities, fair value
Investment securities, at fair value	213,803	62,067
Securities (Assets) [Member]
Investment [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,605	1,589
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, maturities, fair value
Investment securities, at fair value	1,648	1,484
Commercial Mortgage Backed Securities [Member]
Investment [Line Items]
Available-for-sale Securities, Amortized Cost Basis	209,076	60,452
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
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 ten years	178,885
Due after ten years	28,866
Amortized cost basis, total	209,076
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 ten years	181,055
Due after ten years	29,752
Investment securities, at fair value	$ 212,155	$ 60,583