CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 39,897	$ 34,146
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,551	5,659
Amortization of intangible assets	2,131	2,090
Net accretion of premiums & discounts on securities, loans and borrowings	(2,584)	(1,431)
Stock-based compensation	2,036	2,292
Provision for loan losses	3,799	2,100
Amortization of mortgage servicing rights	365	446
Income on bank-owned life insurance policies	(536)	(374)
Gain on investment securities & debt extinguishments	0	(14)
Net gain from sale of loans and other assets	(82)	(524)
Net change in loans held for sale	576	3,538
Change in other assets and liabilities	789	2,464
Net cash provided by operating activities	51,942	50,392
Investing activities:
Proceeds from sales of available-for-sale investment securities	0	10,795
Proceeds from maturities of available-for-sale investment securities	103,709	103,299
Proceeds from maturities of held-to-maturity investment securities	12,602	18,627
Proceeds from maturities of other investment securities	1	1,195
Purchases of available-for-sale investment securities	(724,530)	(147,898)
Purchases of held-to-maturity investment securities	(106,226)	(5,354)
Purchases of other securities	(19,123)	(2)
Net (increase) decrease in loans	(94,829)	10,916
Cash paid for acquisition	0	6,258
Purchases of premises and equipment	(4,132)	(4,235)
Net cash used in investing activities	(832,528)	(6,399)
Financing activities:
Net increase in deposits	115,107	51,503
Net increase (decrease) in borrowings	429,591	(19,779)
Issuance of common stock	61,017	1,852
Cash dividends paid	(19,825)	(15,997)
Tax benefits from share-based payment arrangements	720	284
Net cash provided by financing activities	586,610	17,863
Change in cash and cash equivalents	(193,976)	61,856
Cash and cash equivalents at beginning of period	324,878	211,837
Cash and cash equivalents at end of period	130,902	273,693
Supplemental disclosures of cash flow information:
Cash paid for interest	26,775	30,134
Cash paid for income taxes	9,655	9,689
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	10,260	8,831
Transfers from loans to other real estate	1,977	3,405
Acquisitions
Fair value of assets acquired, excluding acquired cash and intangibles	0	814,144
Fair value of liabilities assumed	$ 0	$ 791,222