CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net Income	$ 371,107	$ 189,171
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for loan losses	131,117	93,177
Amortization of intangibles	4,649	4,689
Depreciation and amortization of premises and equipment	25,575	23,928
Net accretion of discounts and amortization of premiums and deferred fees	(15,246)	(13,510)
Share-based compensation	5,445	0
Impairment losses on long-lived assets	272	0
Other-than-temporary impairment losses on debt securities	0	8,299
Fair value adjustments on mortgage servicing rights	8,929	14,000
FDIC loss share (income) expense	(94,725)	8,732
Adjustments (expense) to indemnity reserves on loans sold	3,453	4,896
(Earnings) losses from investments under the equity method, net of dividends or distributions	(5,400)	(6,743)
Deferred income tax (benefit) expense	(141,066)	52,354
(Gain) loss on:
Disposition of premises and equipment and other productive assets	(680)	5,517
Sale of loans, including valuation adjustments on loans held-for-sale and mortgage banking activities	(3,602)	(12,631)
Sale of foreclosed assets, including write-downs	566	13,603
Acquisitions of loans held-for-sale	(112,687)	(153,085)
Proceeds from sale of loans held-for-sale	29,519	58,857
Net originations on loans held-for-sale	(112,975)	(224,278)
Net decrease (increase) in:
Trading securities	218,904	334,136
Equity securities	(1,124)	(80)
Accrued income receivable	48,252	1,939
Other assets	189,540	(6,747)
Net increase (decrease) in:
Interest payable	50	(189)
Pension and other postretirement benefits obligation	2,363	883
Other liabilities	(181,094)	(16,018)
Total adjustments	35	191,729
Net cash provided by operating activities	371,142	380,900
Cash flows from investing activities:
Net (increase) decrease in money market investments	(3,371,774)	(1,332,447)
Purchases of investment securities:
Available-for-sale	(2,767,257)	(1,738,915)
Equity	(11,176)	(4,900)
Proceeds from calls, paydowns, maturities and redemptions of investment securities:
Available-for-sale	2,291,230	541,660
Held-to-maturity	3,030	2,860
Proceeds from sale of investment securities:
Available-for-sale	0	0
Equity	18,387	2,541
Net repayments on loans	61,890	5,088
Proceeds from sale of loans		0
Acquisition of loan portfolios	(326,503)	(261,987)
Net payments from FDIC under loss sharing agreements	(25,012)	(14,819)
Return of capital from equity method investments	1,519	3,362
Acquisition of premises and equipment	(31,690)	(29,992)
Proceeds from insurance claims	720	0
Proceeds from sale of:
Premises and equipment and other productive assets	5,222	5,186
Foreclosed assets	59,497	60,603
Net cash provided by investing activities	(4,091,917)	(2,761,760)
Net increase (decrease) in:
Deposits	3,921,033	2,625,731
Federal funds purchased and assets sold under agreements to repurchase	(84,010)	(73,040)
Other short-term borrowings	(95,008)	0
Payments of notes payable	(115,749)	(35,074)
Proceeds from issuance of notes payable	140,000	20,000
Proceeds from issuance of common stock	8,818	3,831
Dividends paid	(52,617)	(43,045)
Net payments for repurchase of common stock	(270)	(75,666)
Payments related to tax witholding for share-based compensation	(2,162)	(1,617)
Net cash provided by financing activities	3,720,035	2,421,120
Net decrease in cash and due from banks, and restricted cash	(740)	40,260
Cash and due from banks and restricted cash at beginning of period	412,629	374,196
Cash and due from banks and restricted cash at end of period	$ 411,889	$ 414,456