Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net cash provided by operating activities	$ 13,154	$ 115,922
Cash Flows from Investing Activities
Investments purchased	(628,331)	(608,538)
Investments sold	180,641	353,781
Investments called or matured	469,041	340,321
Net change in short-term investments	(59,088)	(45,612)
Net property and equipment purchased	(11,073)	(2,507)
Investment in CBIC		(135,900)
Net cash used in investing activities	(48,810)	(98,455)
Cash Flows from Financing Activities
Cash dividends paid	(19,940)	(18,757)
Stock option plan share issuance	4,842	4,754
Excess tax benefit from exercise of stock options	871	3,160
Treasury shares purchased		(6,624)
Net cash used in financing activities	(14,227)	(17,467)
Net decrease in cash	(49,883)
Cash at the beginning of the period	81,184
Cash at September 30	$ 31,301