Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities
Net cash provided by operating activities	$ 124,122	$ 134,775
Investing activities
Purchases of securities available for sale	(106,521)	(107,235)
Proceeds from sales of securities available for sale	9,015	86,850
Proceeds from call/maturities of securities available for sale	62,606	106,391
Purchases of securities held to maturity	(70,075)	(99,045)
Proceeds from sales of securities held to maturity	4,461	0
Proceeds from call/maturities of securities held to maturity	84,667	131,483
Net increase in loans	(190,010)	(270,091)
Purchases of premises and equipment	(8,685)	(13,568)
Proceeds from sales of premises and equipment	0	108
Cash Acquired from Acquisition	170,061	0
Net cash used in investing activities	(44,481)	(165,107)
Financing activities
Net increase in noninterest-bearing deposits	20,770	22,671
Net increase (decrease) in interest-bearing deposits	26,735	(38,880)
Net (decrease) increase in short-term borrowings	(5,394)	53,474
Repayment of long-term debt	(7,326)	(85,155)
Cash paid for dividends	(13,951)	(12,832)
Cash received on exercise of stock-based compensation	99	435
Excess tax benefit from stock-based compensation	155	20
Net cash provided by (used in) financing activities	21,088	(60,267)
Net increase (decrease) in cash and cash equivalents	100,729	(90,599)
Cash and cash equivalents at beginning of period	132,420	209,017
Cash and cash equivalents at end of period	233,149	118,418
Noncash transactions:
Transfers of loans to other real estate owned	$ 13,747	$ 34,217