Consolidated Statements of Financial Position (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Cash and cash equivalents:
Cash and cash due from banks	$ 129,209	$ 91,403	$ 126,741
Interest-bearing deposits with unaffiliated banks and others	271,070	444,762	270,217
Total cash and cash equivalents	400,279	536,165	396,958
Investment securities:
Trading securities, at fair value	0	0	1,389
Available-for-sale at fair value	612,466	578,610	644,550
Held-to-maturity (fair value - $187,595 at June 30, 2011, $159,188 at December 31, 2010 and $159,715 at June 30, 2010)	190,029	165,400	165,296
Total investment securities	802,495	744,010	811,235
Other securities	25,572	27,133	27,448
Loans held for sale	6,874	20,479	10,871
Loans	3,748,010	3,681,662	3,647,961
Allowance for loan losses	(89,733)	(89,530)	(89,502)
Net loans	3,658,277	3,592,132	3,558,459
Premises and equipment (net of accumulated depreciation of $84,731 at June 30, 2011, $80,792 at December 31, 2010 and $76,764 at June 30, 2010)	65,252	65,961	68,611
Goodwill	113,414	113,414	109,149
Other intangible assets	12,327	13,521	15,023
Interest receivable and other assets	119,568	133,394	122,762
Total Assets	5,204,058	5,246,209	5,120,516
Deposits:
Noninterest-bearing	813,863	753,553	680,751
Interest-bearing	3,437,113	3,578,212	3,518,431
Total deposits	4,250,976	4,331,765	4,199,182
Interest payable and other liabilities	33,919	37,533	36,378
Short-term borrowings	276,600	242,703	242,271
Federal Home Loan Bank (FHLB) advances	71,928	74,130	86,635
Total liabilities	4,633,423	4,686,131	4,564,466
Shareholders' equity:
Preferred stock, no par value: Authorized - 200,000 shares, none issued	0	0	0
Common stock, $1 par value per share: Authorized - 45,000,000 shares at June 30, 2011 and 30,000,000 at both December 31, 2010 and June 30, 2010; issued and outstanding - 27,456,907 shares at June 30, 2011, 27,440,006 shares at December 31, 2010 and 27,434,027 shares at June 30, 2010	27,457	27,440	27,434
Additional paid-in capital	430,134	429,511	429,021
Retained earnings	126,477	117,238	111,804
Accumulated other comprehensive loss	(13,433)	(14,111)	(12,209)
Total shareholders' equity	570,635	560,078	556,050
Total Liabilities and Shareholders' Equity	$ 5,204,058	$ 5,246,209	$ 5,120,516