Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 102,815	$ 101,856
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	14,717	10,114
Gain on sale of investment securities, net	(33)	(858)
Gain on sale of other real estate owned, net	(482)	(1,530)
Valuation adjustment on other real estate owned	107	1,462
Provision for loan and lease losses	22,329	15,412
Change in cash surrender value of bank owned life insurance	(4,221)	(4,366)
Depreciation, amortization and accretion	29,357	30,059
Loss on sale of premises and equipment	1,004	4,211
Additions to residential mortgage servicing rights carried at fair value	(14,860)	(14,843)
Change in fair value of residential mortgage servicing rights carried at fair value	16,001	34,565
Change in junior subordinated debentures carried at fair value	3,214	3,203
Stock-based compensation	4,275	5,245
Net increase in trading account assets	(503)	(602)
Gain on sale of loans	(61,113)	(80,169)
Change in loans held for sale carried at fair value	(7,074)	(13,809)
Origination of loans held for sale	(1,672,915)	(1,810,425)
Proceeds from sales of loans held for sale	1,672,006	1,972,727
Goodwill impairment	0	142
Change in other assets and liabilities:
Net decrease (increase) in other assets	9,008	(16,958)
Net (decrease) increase in other liabilities	(29,849)	57,836
Net cash provided by operating activities	83,783	293,272
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(725,498)	(247,620)
Proceeds from investment securities available for sale	297,427	319,919
Proceeds from investment securities held to maturity	254	282
Purchases of restricted equity securities	(236,571)	(600)
Redemption of restricted equity securities	236,588	7
Net change in loans and leases	(922,699)	(1,084,966)
Proceeds from sales of loans	98,632	311,669
Net change in premises and equipment	(11,144)	(15,572)
Proceeds from bank owned life insurance death benefits	0	814
Proceeds from sales of other real estate owned	4,937	10,228
Net cash used in investing activities	(1,258,074)	(705,839)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit liabilities	439,569	552,670
Net (decrease) increase in securities sold under agreements to repurchase	(22,759)	55,674
Proceeds from term debt borrowings	100,000	285,000
Repayment of term debt borrowings	(100,000)	(270,015)
Dividends paid on common stock	(70,507)	(70,528)
Proceeds from stock options exercised	463	778
Repurchase and retirement of common stock	(5,943)	(9,374)
Net cash provided by financing activities	340,823	544,205
Net (decrease) increase in cash and cash equivalents	(833,468)	131,638
Cash and cash equivalents, beginning of period	1,449,432	773,725
Cash and cash equivalents, end of period	615,964	905,363
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	37,324	35,820
Income taxes	19,392	12,851
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	11,292	25,218
Cash dividend declared on common stock and payable after period-end	35,241	35,296
Transfer of loans to loans held for sale	0	265,741
Change in GNMA mortgage loans recognized due to repurchase option	5,422	(7,881)
Transfer of loans to other real estate owned	2,628	4,546
Transfers from other real estate owned to loans due to internal financing	$ 0	$ 256