Consolidated Condensed Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Consolidated Condensed Balance Sheets [Abstract]
Amortized cost of securities available-for-sale	$ 772,910,000	$ 1,274,258,000
Fair value of securities held-to-maturity	861,369,000	686,114,000
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares issued	100,000	100,000
Preferred stock per share liquidation preference	$ 1,000	$ 1,000
Common stock no par value
Common stock shares authorized	20,000,000	20,000,000
Common stock shares issued	16,151,033	16,151,062
Treasury stock shares	752,129	752,128