Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income	$ 34,146	$ 30,164
Depreciation	5,659	4,941
Amortization of intangible assets	2,090	3,708
Net amortization (accretion) of premiums & discounts on securities, loans and borrowings	(1,431)	1,528
Stock-based compensation	2,292	2,001
Provision for loan losses	2,100	3,870
Amortization of mortgage servicing rights	446	382
Income on bank-owned life insurance policies	(374)	(280)
Gain on investment securities and debt extinguishments, net	(14)	0
Net gain on sale of loans and other assets	(524)	(246)
Net change in loans held for sale	3,538	1,005
Change in other assets and liabilities	2,464	(1,466)
Net cash provided by operating activities	50,392	45,607
Investing activities:
Proceeds from sales of available-for-sale investment securities	10,795	0
Proceeds from maturities of held-to-maturity investment securities	18,627	42,857
Proceeds from maturities of available-for-sale investment securities	103,299	95,573
Purchases of held-to-maturity investment securities	(5,354)	(319,772)
Purchases of available-for-sale investment securities	(147,898)	(71,014)
Sales of other securities	1,195	1,060
Purchases of other securities	(2)	(8)
Net decrease in loans	10,916	5,158
Cash received from acquisition, net of cash paid of $20,643 and $0	6,258	0
Capital expenditures	(4,235)	(6,676)
Net cash used in investing activities	(6,399)	(252,822)
Financing activities:
Net increase in deposits	51,503	15,489
Net decrease in borrowings	(19,779)	(25,222)
Issuance of common stock	1,852	3,063
Cash dividends paid	(15,997)	(14,479)
Excess tax benefits from stock-based compensation	284	455
Net cash provided by (used in) financing activities	17,863	(20,694)
Change in cash and cash equivalents	61,856	(227,909)
Cash and cash equivalents at beginning of period	211,837	361,876
Cash and cash equivalents at end of period	273,693	133,967
Supplemental disclosures of cash flow information:
Cash paid for interest	30,134	34,870
Cash paid for income taxes	9,689	0
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	8,831	7,955
Transfers from loans to other real estate	3,405	1,816
Acquisitions:
Fair value of assets acquired, excluding acquired cash and intangibles	814,144	0
Fair value of liabilities assumed	$ 791,222	$ 0