Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 160,225	$ 160,223
Federal funds sold and other short-term investments	4,783	7,831
Cash and cash equivalents	165,008	168,054
Time deposits in other financial institutions	3,605	0
Securities:
Trading, at fair value	1,219	380
Available for sale, at fair value (cost of $1,409,106 at September 30, 2013, and $1,472,565 at December 31, 2012)	1,391,610	1,506,075
Held to maturity, at cost (fair value of $53,893 at September 30, 2013, and $55,982 at December 31, 2012)	53,841	55,502
Loans held for sale	61,326	96,165
Loans and leases receivable:
Held to maturity	2,901,706	2,821,549
Loans covered by loss share agreements	5,876	7,253
Allowance for loan and lease losses	(41,311)	(38,715)
Loans and leases receivable, net	2,866,271	2,790,087
Premises, furniture and equipment, net	129,029	128,294
Other real estate, net	33,018	35,822
Goodwill	30,627	30,627
Other intangible assets, net	23,435	18,486
Cash surrender value on life insurance	79,238	75,480
FDIC indemnification asset	795	749
Other assets	73,708	84,832
TOTAL ASSETS	4,912,730	4,990,553
Deposits:
Demand	1,073,688	974,232
Savings	2,043,397	2,004,438
Time	807,913	866,990
Total deposits	3,924,998	3,845,660
Short-term borrowings	224,048	224,626
Other borrowings	322,538	389,025
Accrued expenses and other liabilities	44,543	126,703
TOTAL LIABILITIES	4,516,127	4,586,014
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; authorized 25,000,000 shares; issued 16,952,561 shares at September 30, 2013 and 16,827,835 shares at December 31, 2012)	16,953	16,828
Capital surplus	52,641	50,359
Retained earnings	259,172	236,279
Accumulated other comprehensive income (loss)	(13,819)	16,641
Treasury stock at cost (1,508 shares at September 30, 2013, and 0 shares at December 31, 2012)	(42)	0
TOTAL STOCKHOLDERS' EQUITY	396,603	401,805
Noncontrolling interest	0	2,734
TOTAL EQUITY	396,603	404,539
TOTAL LIABILITIES AND EQUITY	4,912,730	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