Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 68,450	$ 160,223
Federal funds sold and other short-term investments	6,137	7,831
Cash and cash equivalents	74,587	168,054
Time deposits in other financial institutions	3,605	0
Trading, at fair value	694	380
Available for sale, at fair value (cost of $1,496,167 at March 31, 2013, and $1,472,565 at December 31, 2012)	1,524,569	1,506,075
Held to maturity, at cost (fair value of $55,846 at March 31, 2013, and $55,982 at December 31, 2012)	55,456	55,502
Loans held for sale	91,708	96,165
Loans and leases receivable:
Held to maturity	2,789,893	2,821,549
Loans covered by loss share agreements	6,741	7,253
Allowance for loan and lease losses	(37,528)	(38,715)
Loans and leases receivable, net	2,759,106	2,790,087
Premises, furniture and equipment, net	128,411	128,294
Other real estate, net	36,704	35,822
Goodwill, net	30,627	30,627
Other intangible assets, net	20,266	18,486
Cash surrender value on life insurance	75,907	75,480
FDIC indemnification asset	528	749
Other assets	98,390	84,832
TOTAL ASSETS	4,900,558	4,990,553
Deposits:
Demand	971,142	974,232
Savings	2,022,625	2,004,438
Time	848,689	866,990
Total deposits	3,842,456	3,845,660
Short-term borrowings	202,694	224,626
Other borrowings	336,577	389,025
Accrued expenses and other liabilities	104,857	126,703
TOTAL LIABILITIES	4,486,584	4,586,014
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; authorized 25,000,000 shares; issued 16,866,959 shares at March 31, 2013 and 16,827,835 shares at December 31, 2012)	16,867	16,828
Capital surplus	52,131	50,359
Retained earnings	246,675	236,279
Accumulated other comprehensive income	13,831	16,641
Treasury stock at cost (1,040 shares at March 31, 2013, and 0 shares at December 31, 2012)	(26)	0
TOTAL STOCKHOLDERS' EQUITY	411,176	401,805
Noncontrolling interest	2,798	2,734
TOTAL EQUITY	413,974	404,539
TOTAL LIABILITIES AND EQUITY	4,900,558	4,990,553
Preferred Stock [Member]
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series A Preferred Stock [Member]
STOCKHOLDERS' EQUITY:
Preferred stock	0	0
Series C Preferred Stock [Member]
STOCKHOLDERS' EQUITY:
Preferred stock	$ 81,698	$ 81,698