Consolidated Balance Sheets (Parantheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Held-to-maturity Securities, Fair Value	$ 216,625	$ 118,235
Series A Preferred Stock [Member]
Preferred stock, no par value, authorized 20,000,000 shares [Abstract]
Preferred Stock, Liquidation Preference Per Share	$ 1,000.00	$ 1,000.00
Preferred Stock, Shares Issued	0	31,260
Preferred Stock, Shares Outstanding	0	31,260
Series B Preferred Stock [Member]
Preferred stock, no par value, authorized 20,000,000 shares [Abstract]
Preferred Stock, Shares Issued	0	1,804,566
Preferred Stock, Shares Outstanding	0	1,804,566
Preferred Stock, Par or Stated Value Per Share	$ 10	$ 10
Common Stock [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Common Stock, Shares Authorized	60,000,000	60,000,000
Common Stock, Shares, Issued	20,486,997	20,462,667
Common Stock, Shares, Outstanding	20,486,997	20,462,667
Nonvoting Common Stock [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Common Stock, Shares Authorized	20,000,000	20,000,000
Common Stock, Shares, Issued	5,992,213	4,187,647
Common Stock, Shares, Outstanding	5,992,213	4,187,647