CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 54,154	$ 47,426
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,608	7,447
Amortization of intangible assets	3,251	4,985
Net (accretion) amortization of premiums & discounts on securities, loans and borrowings	(1,356)	1,957
Stock-based compensation	3,038	2,767
Provision for loan losses	3,143	5,270
Amortization of mortgage servicing rights	667	574
Income on bank-owned life insurance policies	(581)	(356)
Gain on investment securities and debt extinguishments, net	(8)	0
Net gain on sale of loans and other assets	(281)	(46)
Net change in loans held for sale	4,410	1,011
Change in other assets and liabilities	5,556	495
Net cash provided by operating activities	80,600	71,530
Investing activities:
Proceeds from sales of available-for-sale investment securities	13,371	0
Proceeds from maturities of held-to-maturity investment securities	54,152	60,039
Proceeds from maturities of available-for-sale investment securities	151,997	116,889
Purchases of held-to-maturity investment securities	(7,424)	(323,745)
Purchases of available-for-sale investment securities	(176,188)	(109,227)
Sales of other securities	1,197	1,061
Purchases of other securities	(3,075)	(5)
Net decrease in loans	9,038	14,519
Cash received from acquisition, net of cash paid of $20,704 and $0	6,197	0
Purchases of premises and equipment	(6,895)	(11,497)
Net cash provided by (used in) investing activities	42,370	(251,966)
Financing activities:
Net increase in deposits	133,154	41,849
Net decrease in borrowings	(19,884)	(25,271)
Issuance of common stock	2,273	3,388
Cash dividends paid	(24,828)	(22,434)
Excess tax benefits from stock-based compensation	355	584
Net cash provided by (used in) financing activities	91,070	(1,884)
Change in cash and cash equivalents	214,040	(182,320)
Cash and cash equivalents at beginning of period	211,837	361,876
Cash and cash equivalents at end of period	425,877	179,556
Supplemental disclosures of cash flow information:
Cash paid for interest	45,970	51,145
Cash paid for income taxes	14,750	6,050
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	9,575	7,959
Transfers from loans to other real estate	4,011	3,639
Acquisitions:
Fair value of assets acquired, excluding acquired cash and intangibles	815,828	0
Fair value of liabilities assumed	$ 791,222	$ 0