CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net Income	$ 91,324	$ 92,945
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for loan losses	71,063	40,698
Amortization of intangibles	2,325	2,345
Depreciation and amortization of premises and equipment	12,836	11,799
Net accretion of discounts and amortization of premiums and deferred fees	(7,006)	(6,463)
Stock Based Compensation	3,112	0
Impairment losses on long-lived assets	272	0
Fair value adjustments on mortgage servicing rights	4,307	5,954
FDIC loss share (income) expense	8,027	8,257
Adjustments (expense) to indemnity reserves on loans sold	2,926	1,966
Earnings from investments under the equity method, net of dividends or distributions	(7,370)	(9,213)
Deferred income tax (benefit) expense	10,758	25,060
(Gain) loss on:
Disposition of premises and equipment and other productive assets	(72)	6,466
Sale of loans, including valuation adjustments on loans held-for-sale and mortgage banking activities	(1,116)	(5,381)
Sale of foreclosed assets, including write-downs	(99)	4,512
Acquisitions of loans held-for-sale	(47,335)	(73,043)
Proceeds from sale of loans held-for-sale	12,036	29,364
Net originations on loans held-for-sale	(48,375)	(123,336)
Net (increase) decrease in:
Trading securities	93,998	176,937
Equity securities	(130)	435
Accrued income receivable	56,504	10,024
Other assets	36,014	11,995
Net increase (decrease) in:
Interest payable	(10,614)	(11,281)
Pension and other postretirement benefits obligation	1,225	331
Other liabilities	(94,529)	(13,654)
Total adjustments	98,757	93,772
Net cash provided by operating activities	190,081	186,717
Cash flows from investing activities:
Net (increase) decrease in money market investments	(1,728,858)	(766,208)
Purchases of investment securities:
Available-for-sale	(1,311,382)	(1,216,880)
Equity	(9,730)	(225)
Proceeds from calls, paydowns, maturities and redemptions of investment securities:
Available-for-sale	1,016,203	222,677
Held-to-maturity	2,639	2,184
Proceeds from sale of investment securities:
Equity	9,745	1,757
Net repayments on loans	93,482	99,306
Acquisition of loan portfolios	(161,295)	(109,098)
Net payments from FDIC under loss sharing agreements	(1,263)	(23,574)
Return of capital from equity method investments	0	3,362
Acquisition of premises and equipment	(13,046)	(18,646)
Proceeds from insurance claims	258	0
Proceeds from sale of:
Premises and equipment and other productive assets	3,033	3,011
Foreclosed assets	25,746	27,547
Net cash provided by investing activities	(2,074,468)	(1,774,787)
Net increase (decrease) in:
Deposits	1,678,029	1,715,958
Federal funds purchased and assets sold under agreements to repurchase	(10,860)	(44,711)
Other short-term borrowings	89,992	0
Payments of notes payable	(12,680)	(17,408)
Proceeds from issuance of notes payable	40,000	0
Proceeds from issuance of common stock, including reissuance of treasury shares	4,712	1,806
Dividends paid	(26,138)	(16,499)
Net payments for repurchase of common stock	(193)	(75,604)
Payments related to tax witholding for shared-based compensation	(1,223)	(719)
Net cash provided by financing activities	1,761,639	1,562,823
Net decrease in cash and due from banks	(122,748)	(25,247)
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	$ 289,881	$ 348,949