Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 25,734	$ 21,470
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	421	2,801
Depreciation and amortization	5,271	4,547
Net amortization of securities premiums and discounts	782	2,558
Realized securities gains	(4,258)	(1,324)
Gain on sales of loans	(1,338)	(872)
Cash receipts from the sale of loans originated for sale	103,117	75,562
Cash disbursements for loans originated for sale	(106,365)	(74,175)
Deferred income tax benefit	(132)	(1,309)
Gains on other assets	(288)	(1,058)
Decrease in interest receivable	1,130	2,051
Decrease in interest payable	(450)	(128)
Amortization of stock based compensation arrangements	798	646
Other, net	5,085	4,076
Net cash provided by operating activities	29,507	34,845
INVESTING ACTIVITIES
Net decrease in federal funds sold	400	41,107
Purchases of securities:
Held for investment	(2,525)	(6,400)
Available for sale	(41,330)	(32,183)
Maturities of securities:
Held for investment	2,831	2,755
Available for sale	70,033	134,557
Proceeds from sales and calls of securities:
Held for investment	2,417	2
Available for sale	8,129	65,478
Purchases of loans	(17,255)	(26,847)
Proceeds from sales of loans	16,872	3,226
Net other increase in loans	(49,192)	(32,286)
Purchases of premises, equipment and computer software	(7,015)	(8,135)
Proceeds from the sale of other assets	7,213	12,196
Net cash (used in) provided by investing activities	(9,422)	153,470
FINANCING ACTIVITIES
Net increase in demand, transaction and savings deposits	112,565	215,139
Net decrease in time deposits	(50,652)	(16,894)
Net decrease in short-term borrowings	(1,934)	(5,850)
Paydown of long-term borrowings	(7,147)	(2,144)
Redemption of junior subordinated debentures	(9,279)
Issuance of common stock	964	564
Common stock acquired	(256)	(4,423)
Cash dividends paid	(8,171)	(7,687)
Net cash provided by financing activities	36,090	178,705
Net increase in cash, due from banks and interest bearing deposits	56,175	367,020
Cash, due from banks and interest bearing deposits at the beginning of the period	1,707,733	1,204,079
Cash, due from banks and interest bearing deposits at the end of the period	1,763,908	1,571,099
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	9,946	13,917
Cash paid during the period for income taxes	$ 13,775	$ 14,000