Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Operating activities:
Net income	$ 22,196	$ 20,779
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion and amortization	2,784	2,205
Provision for loan losses	14,100	16,550
Other-than-temporary impairment on investment securities
Amortization of core deposit intangibles	669	936
Realized net investment security gains	(6,635)	(8,304)
OREO devaluations	2,535	1,145
Changes in assets and liabilities:
(Increase) in other assets	(20,776)	(10,678)
(Decrease) in other liabilities	(6,539)	(4,079)
Net cash provided by operating activities	8,334	18,554
Investing activities:
Proceeds from sales of available-for-sale securities	113,105	284,031
Proceeds from maturity of:
Available-for-sale securities	75,071	269,462
Held-to-maturity securities	59,506	22,478
Purchases of:
Available-for-sale securities	(231,714)	(533,677)
Held-to-maturity securities		(2,205)
Net (increase) decrease in loans	(25,403)	30,349
Purchases of bank owned life insurance, net	(3,000)	(4,562)
Purchases of premises and equipment, net	(1,990)	(1,862)
Net cash (used in) provided by investing activities	(14,425)	64,014
Financing activities:
Net increase in deposits	219,258	80,806
Net (decrease) in short-term borrowings	(346,950)	(57,144)
Proceeds from issuance of long-term debt	150,000
Repayment of long-term debt	(24)	(20)
Cash payment for fractional shares in dividend reinvestment plan	(1)	(1)
Cash dividends paid on common and preferred stock	(15,725)	(15,240)
Net cash provided by financing activities	6,558	8,401
Increase in cash and cash equivalents	467	90,969
Cash and cash equivalents at beginning of year	133,780	159,091
Cash and cash equivalents at end of period	134,247	250,060
Supplemental disclosures of cash flow information:
Interest	15,217	20,494
Income taxes
Non cash activities:
Securities acquired through payable	$ 25,000	$ 112,450