Consolidated Statements of Financial Position (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Cash and cash equivalents:
Cash and cash due from banks	$ 121,294	$ 91,403
Interest-bearing deposits with unaffiliated banks and others	260,646	444,762
Total cash and cash equivalents	381,940	536,165
Investment securities:
Available-for-sale at fair value	667,276	578,610
Held-to-maturity (fair value - $183,769 at December 31, 2011 and $159,188 at December 31, 2010)	183,339	165,400
Total investment securities	850,615	744,010
Loans held for sale	18,818	20,479
Loans	3,831,285	3,681,662
Allowance for loan losses	(88,333)	(89,530)
Net loans	3,742,952	3,592,132
Premises and equipment	65,997	65,961
Goodwill	113,414	113,414
Other intangible assets	11,472	13,521
Interest receivable and other assets	154,245	160,527
Total Assets	5,339,453	5,246,209
Deposits:
Noninterest-bearing	875,791	753,553
Interest-bearing	3,491,066	3,578,212
Total deposits	4,366,857	4,331,765
Interest payable and other liabilities	54,024	37,533
Short-term borrowings	303,786	242,703
Federal Home Loan Bank (FHLB) advances	43,057	74,130
Total liabilities	4,767,724	4,686,131
Shareholders' equity:
Preferred stock, no par value: Authorized - 200,000 shares, none issued
Common stock, $1 par value per share: Authorized - 45,000,000 shares at December 31, 2011 and 30,000,000 shares at December 31, 2010; Issued and outstanding - 27,456,907 shares at December 31, 2011 and 27,440,006 shares at December 31, 2010	27,457	27,440
Additional paid in capital	431,277	429,511
Retained earnings	138,324	117,238
Accumulated other comprehensive loss	(25,329)	(14,111)
Total shareholders' equity	571,729	560,078
Total Liabilities and Shareholders' Equity	$ 5,339,453	$ 5,246,209