Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 holding	Dec. 31, 2012 holding
Summary of gross unrealized losses and fair value of investments
No of holdings	34	38
Fair value, less than 12 months	$ 110,688	$ 50,344
Unrealized losses, less than 12 months	889	225
Fair value, 12 months or longer	2,062	2,069
Unrealized losses, 12 months or longer	2,253	2,415
Fair value, Total	112,750	52,413
Unrealized losses, Total	3,142	2,640
Agency Mortgage-Backed Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	14	17
Fair value, less than 12 months	36,218	23,814
Unrealized losses, less than 12 months	(256)	114
Fair value, 12 months or longer		0
Unrealized losses, 12 months or longer		0
Fair value, Total	36,218	23,814
Unrealized losses, Total	(256)	114
Collateralized Mortgage Obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings		2
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings		2
Fair value, less than 12 months		2,240
Unrealized losses, less than 12 months		(15)
Fair value, 12 months or longer
Unrealized losses, 12 months or longer
Fair value, Total		2,240
Unrealized losses, Total		(15)
Agency Collateralized Mortgage Obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	7
Fair value, less than 12 months	69,639	17,677
Unrealized losses, less than 12 months	(573)	39
Fair value, 12 months or longer		0
Unrealized losses, 12 months or longer		0
Fair value, Total	69,639	17,677
Unrealized losses, Total	(573)	39
Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	2	2
Fair value, less than 12 months	0
Unrealized losses, less than 12 months	0
Fair value, 12 months or longer	2,062	2,069
Unrealized losses, 12 months or longer	2,253	(2,415)
Fair value, Total	2,062	2,069
Unrealized losses, Total	2,253	(2,415)
Marketable Equity Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	11
Fair value, less than 12 months	4,831
Unrealized losses, less than 12 months	(60)
Fair value, 12 months or longer
Unrealized losses, 12 months or longer
Fair value, Total	4,831
Unrealized losses, Total	$ (60)