Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 49,614	$ 48,780
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	20,486	21,778
Gain on sale of investment securities, net	(15)	(1,178)
Gain on sale of non-covered other real estate owned	(713)	(643)
Gain on sale of covered other real estate owned	(457)	(723)
Valuation adjustment on non-covered other real estate owned	437	4,719
Valuation adjustment on covered other real estate owned	679	3,346
Provision for non-covered loan and lease losses	9,981	9,805
Provision for covered loan and lease losses	(2,840)	1,375
Proceeds from bank owned life insurance	1,173	0
Change in FDIC indemnification asset	13,367	5,885
Depreciation, amortization and accretion	8,921	7,949
Increase in mortgage servicing rights	(11,110)	(6,281)
Change in mortgage servicing rights carried at fair value	346	1,952
Change in junior subordinated debentures carried at fair value	1,078	1,007
Stock-based compensation	2,222	1,942
Net (increase) decrease in trading account assets	(116)	(992)
Gain on sale of loans	(47,116)	(22,101)
Change in loans held for sale carried at fair value	16,801	(5,993)
Origination of loans held for sale	(1,000,688)	(786,697)
Proceeds from sales of loans held for sale	1,174,397	703,875
Excess tax benefits from the exercise of stock options	(49)	(49)
Change in other assets and liabilities:
Net decrease in other assets	26,744	(1,218)
Net increase in other liabilities	(20,189)	11,199
Net cash provided by operating activities	242,953	(2,263)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(51,191)	(419,078)
Proceeds from investment securities available for sale	530,898	727,750
Proceeds from investment securities held to maturity	914	363
Redemption of restricted equity securities	1,331	869
Net non-covered loan and lease originations	(160,345)	(239,262)
Net covered loan and lease paydowns	47,744	56,468
Proceeds from sales of non-covered loans	53,264	5,964
Proceeds from insurance settlement on loss of property	575	1,425
Proceeds from fee on termination of merger transaction	0	1,600
Proceeds from disposals of furniture and equipment	139	1,508
Purchases of premises and equipment	(16,514)	(12,197)
Net proceeds from FDIC indemnification asset	3,065	21,418
Proceeds from sales of non-covered other real estate owned	11,210	12,208
Proceeds from sales of covered other real estate owned	8,126	8,733
Net cash used by investing activities	429,216	167,769
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in deposit liabilities	(422,723)	(104,348)
Net increase in securities sold under agreements to repurchase	39,372	24,736
Repayment of junior subordinated debentures	(8,764)	0
Dividends paid on common stock	(16,931)	(15,777)
Excess tax benefits from stock based compensation	49	49
Proceeds from stock options exercised	846	78
Retirement of common stock	(2,811)	(5,234)
Net cash used by financing activities	(410,962)	(100,496)
Net increase in cash and cash equivalents	261,207	65,010
Cash and cash equivalents, beginning of period	543,787	598,766
Cash and cash equivalents, end of period	804,994	663,776
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	21,825	27,573
Income taxes	13,100	13,800
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	(24,741)	(3,124)
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	32	79
Cash dividend declared on common stock and payable after period-end	16,907	10,139
Transfer of non-covered loans to non-covered other real estate owned	7,032	8,993
Transfer of covered loans to covered other real estate owned	2,554	1,346
Transfer of covered loans to non-covered loans	10,560	9,299
Transfer from FDIC indemnification asset to due from FDIC and other	3,168	16,399
Receivable from sales of covered other real estate owned	$ 1,096	$ 290