Consolidated Statements of Cash Flow (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 13,372	$ 14,005
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	300	173
Depreciation and amortization	2,751	2,588
Net amortization of securities premiums and discounts	417	412
Realized securities gains	(122)	(4,032)
Gain on sales of loans	(688)	(572)
Cash receipts from the sale of loans originated for sale	54,540	45,767
Cash disbursements for loans originated for sale	(50,479)	(48,734)
Deferred income tax benefit	(96)	(20)
Gains on other assets	(99)	(30)
(Increase) decrease in interest receivable	(318)	1,505
Decrease in interest payable	(158)	(237)
Amortization of stock- based compensation arrangements	374	441
Other, net	3,819	3,619
Net cash provided by operating activities	23,613	14,885
INVESTING ACTIVITIES
Net decrease in Federal funds sold	700	400
Purchases of securities:
Available for sale	(20,565)	(9,785)
Maturities of securities:
Held for investment	315	1,099
Available for sale	15,317	44,034
Proceeds from sales and calls of securities:
Available for sale	1,027	6,470
Purchases of loans	(26,597)	(542)
Proceeds from sales of loans	27,426	11,485
Net other decrease/( increase) in loans	17,252	(44,317)
Purchases of premises, equipment and computer software	(3,683)	(5,005)
Proceeds from the sale of other assets	988	4,937
Net cash provided by investing activities	12,180	8,776
FINANCING ACTIVITIES
Net (decrease)/ increase in demand, transaction and savings deposits	(239,034)	148,109
Net decrease in time deposits	(27,284)	(32,988)
Net in increase/(decrease) in short-term borrowings	320	(951)
Issuance/(paydown) of long-term borrowings	1,862	(5,073)
Issuance of common stock	190	544
Common stock acquired	(943)
Cash dividends paid		(4,081)
Net cash (used in) provided by financing activities	(264,889)	105,560
Net (decrease) increase in cash, due from banks and interest-bearing deposits	(229,096)	129,221
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,945,148	1,707,733
Cash, due from banks and interest-bearing deposits at the end of the period	1,716,052	1,836,954
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	$ 3,753	$ 5,185