Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Securities, held to maturity fair value	$ 213,947,000	$ 199,857,000
Allowance for loan losses	23,759,000	21,620,000
Preferred stock, par value	$ 10.00	$ 10.00
Preferred stock, liquidation preference	$ 1,000,000	$ 1,000,000
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	40,000	40,000
Preferred stock, shares outstanding	40,000	40,000
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	14,126,783	14,125,346
Common stock, shares outstanding	14,126,783	14,125,346