Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 159,520	$ 95,076
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	18,135	15,320
Gain on sale of investment securities, net	(355)	(1,878)
(Gain) loss on sale of other real estate owned, net	(646)	301
Valuation adjustment on other real estate owned	2,782	206
Provision for loan and lease losses	32,044	35,000
Change in cash surrender value of bank owned life insurance	(6,588)	(4,008)
Change in FDIC indemnification asset	1,053	13,169
Depreciation and amortization	37,716	27,299
Increase in residential mortgage servicing rights	(27,812)	(16,583)
Change in residential mortgage servicing rights carried at fair value	20,257	8,393
Change in junior subordinated debentures carried at fair value	4,371	4,082
Stock-based compensation	11,275	11,597
Net decrease in trading account assets	490	724
Gain on sale of loans	(115,399)	(63,729)
Change in loans held for sale carried at fair value	(5,716)	(6,894)
Origination of loans held for sale	(2,703,100)	(1,523,959)
Proceeds from sales of loans held for sale	2,694,945	1,638,975
Excess tax benefits from the exercise of stock options	(563)	(2,046)
Change in other assets and liabilities:
Net increase in other assets	67,919	19,847
Net increase in other liabilities	23,317	23,203
Net cash provided by operating activities	213,645	274,095
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(706,964)	(346,844)
Proceeds from investment securities available for sale	508,428	1,116,539
Proceeds from investment securities held to maturity	481	566
Redemption of restricted equity securities	72,430	4,190
Net loan and lease originations	(1,313,156)	(792,592)
Proceeds from sales of loans	246,100	284,274
Proceeds from disposals of furniture and equipment	3,571	1,923
Purchases of premises and equipment	(59,117)	(43,761)
Net proceeds from (payments to) FDIC indemnification asset	1,571	(2,359)
Proceeds from bank owned life insurance	4,485	681
Proceeds from sales of other real estate owned	18,747	11,768
Net cash paid in branch divestiture	0	(127,557)
Cash acquired in merger, net of cash consideration paid	0	116,867
Net cash (used) provided by investing activities	(1,223,424)	223,695
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit liabilities	578,995	739,173
Net increase (decrease) in securities sold under agreements to repurchase	10,401	(470,261)
Repayment of term debt	(114,999)	(47,003)
Dividends paid on common stock	(99,333)	(66,557)
Excess tax benefits from stock based compensation	563	2,046
Proceeds from stock options exercised	1,133	5,161
Retirement of common stock	(14,536)	(7,062)
Net cash provided by financing activities	362,224	155,497
Net (decrease) increase in cash and cash equivalents	(647,555)	653,287
Cash and cash equivalents, beginning of period	1,605,171	790,423
Cash and cash equivalents, end of period	957,616	1,443,710
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	50,156	38,955
Income taxes	17,334	6,622
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	2,004	11,504
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	0	57
Cash dividend declared on common stock and payable after period-end	35,285	32,684
Transfer of loans to other real estate owned	6,833	14,089
Transfer from FDIC indemnification asset to due from FDIC and other	2,472	2,194
Assets acquired, including goodwill of $1,024,335	0	9,877,740
Liabilities assumed	$ 0	$ 8,769,608