Condensed Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments held-to-maturity, fair value	$ 169,396	$ 184,167
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	24,886,724	24,091,042
Common stock, shares outstanding	24,886,724	24,091,042