Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale Debt securities, Amortized cost	$ 129,680	$ 110,738
Available-for-sale Equity securities, Amortized cost	$ 22,174	$ 17,248
Preferred stock, no par value
Preferred stock, authorized	18,100,000	18,100,000
Preferred stock, issued
Preferred stock, outstanding
Common stock, no par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	10,970,108	10,939,268
Common stock, Outstanding	10,970,108	10,939,268
7% Series A Cumulative Convertible Preferred Stock [Member]
Preferred stock, liquidation preference, per share	$ 10.00	$ 10.00
Preferred stock, no par value
Preferred stock, authorized	1,500,000	1,500,000
Preferred stock, issued	10,206	110,684
Preferred stock, outstanding	10,206	110,684
Series B Preferred Stock [Member]
Preferred stock, no par value
Preferred stock, authorized	400,000	400,000
Preferred stock, issued
Preferred stock, outstanding