Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 73,091	$ 73,933
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	27,984	33,023
Gain on sale of investment securities, net	(18)	(1,199)
(Gain) loss on sale of non-covered other real estate owned	(751)	481
Gain on sale of covered other real estate owned	(549)	(1,031)
Valuation adjustment on non-covered other real estate owned	448	5,763
Valuation adjustment on covered other real estate owned	703	4,115
Provision for non-covered loan and lease losses	12,989	16,883
Provision for covered loan and lease losses	(4,744)	4,302
Proceeds from bank owned life insurance	1,173	0
Change in FDIC indemnification asset	19,841	10,644
Depreciation, amortization and accretion	13,292	11,848
Increase in mortgage servicing rights	(15,182)	(11,923)
Change in mortgage servicing rights carried at fair value	757	5,618
Change in junior subordinated debentures carried at fair value	1,637	1,633
Stock-based compensation	3,531	2,981
Net (increase) decrease in trading account assets	(265)	(744)
Gain on sale of loans	(52,899)	(50,668)
Change in loans held for sale carried at fair value	11,099	(11,324)
Origination of loans held for sale	(1,368,902)	(1,359,520)
Proceeds from sales of loans held for sale	1,614,097	1,294,321
Excess tax benefits from the exercise of stock options	(40)	(51)
Change in other assets and liabilities:
Net decrease in other assets	34,007	(9,348)
Net increase in other liabilities	(11,983)	22,493
Net cash provided by operating activities	359,316	42,230
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(51,191)	(784,797)
Payments to Acquire Held-to-maturity Securities	(2,126)	(931)
Proceeds from investment securities available for sale	702,910	1,018,791
Proceeds from investment securities held to maturity	1,073	511
Redemption of restricted equity securities	1,999	1,216
Net non-covered loan and lease originations	(352,390)	(391,733)
Net covered loan and lease paydowns	68,819	85,510
Proceeds from sales of non-covered loans	60,298	13,496
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	330	1,700
Purchases of premises and equipment	(25,575)	(17,155)
Net proceeds from FDIC indemnification asset	4,621	26,615
Proceeds from sales of non-covered other real estate owned	13,940	18,834
Proceeds from sales of covered other real estate owned	9,794	11,523
Payments to Acquire Businesses, Net of Cash Acquired	(149,658)	0
Net cash used by investing activities	283,419	(13,395)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in deposit liabilities	(311,708)	(136,519)
Net increase in securities sold under agreements to repurchase	78,235	36,446
Repayments of Long-term Debt	(211,204)	0
Repayment of junior subordinated debentures	(8,764)	0
Dividends paid on common stock	(33,837)	(25,919)
Excess tax benefits from stock based compensation	40	51
Proceeds from stock options exercised	2,511	324
Retirement of common stock	(4,704)	(5,378)
Net cash used by financing activities	(489,431)	(130,995)
Net increase (decrease) in cash and cash equivalents	153,304	(102,160)
Cash and cash equivalents, beginning of period	543,787	598,766
Cash and cash equivalents, end of period	697,091	496,606
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	32,419	40,653
Income taxes	27,711	31,825
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	(21,216)	(2,019)
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	43	114
Cash dividend declared on common stock and payable after period-end	16,930	10,140
Transfer of non-covered loans to non-covered other real estate owned	14,747	10,167
Transfer of covered loans to covered other real estate owned	2,554	3,227
Transfer of covered loans to non-covered loans	13,366	14,367
Transfer from FDIC indemnification asset to due from FDIC and other	3,530	19,939
Fair Value of Assets Acquired	376,071	0
Liabilities Assumed	$ 219,961	$ 0