Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 202,281	$ 121,388
Adjustments to reconcile net income to cash provided by operating activities:
Provision (credit) for loan and lease losses	20,555	9,405
Deferred tax expense (benefit)	45,628	(8,501)
Net change in current taxes	17,404	(5,757)
Depreciation	45,420	44,476
Net increase (decrease) in accrued interest payable	1,344	624
Net (increase) decrease in income earned not collected	(290)	(1,872)
Gain on acquisitions	(134,745)	(4,994)
Securities (gains) losses	(3,327)	(17,157)
Loss on termination of FDIC shared-loss agreements	45	3,377
Origination of loans held for sale	(299,136)	(361,652)
Proceeds from sale of loans held for sale	309,791	342,505
Gain on sale of loans held for sale	(6,279)	(5,882)
(Gain) loss on sale of portfolio loans	(164)	0
Net writedowns/losses on other real estate	2,160	3,884
(Gain) loss on sales of premises and equipment	(159)	0
Net accretion of premiums and discounts	(22,918)	(23,859)
Amortization of intangible assets	11,045	11,135
Reduction FDIC receivable for shared-loss agreements	4,821	7,571
Net increase (decrease) in FDIC payable for shared-loss agreements	2,118	(14,001)
Net change in other assets	(34,340)	(25,924)
Net change in other liabilities	29,647	19,718
Net cash provided by operating activities	190,901	94,484
INVESTING ACTIVITIES
Net change in loans outstanding	(462,385)	(416,812)
Purchases of investment securities available for sale	(1,186,883)	(1,966,181)
Proceeds from maturities of investment securities held to maturity	18	99
Proceeds from maturities of investment securities available for sale	1,140,459	627,971
Proceeds from sales of investment securities available for sale	517,588	1,370,768
Net change in overnight investments	(908,583)	(173,134)
Proceeds from sales of portfolio loans	32,294	13,328
Cash (paid to) received from the FDIC for shared-loss agreements	(5,197)	(13,502)
Net payment to the FDIC for termination of shared-loss agreements	(285)	(20,115)
Proceeds from sale of other real estate	20,236	16,010
Proceeds fro sales of premises and equipment	2,305	0
Additions to premises and equipment	(35,912)	(29,617)
Net cash acquired in business acquisitions	300,703	27,943
Net cash (used) provided by investing activities	(585,642)	(563,242)
FINANCING ACTIVITIES
Net change in time deposits	(238,751)	(250,151)
Net change in demand and other interest-bearing deposits	429,684	421,082
Net change in short-term borrowings	61,030	132,167
Repayment of long-term obligations	(7,985)	(3,651)
Origination of long-term obligations	175,000	150,000
Cash dividends paid	(7,206)	(7,206)
Net cash provided (used) by financing activities	411,772	442,241
Change in cash and due from banks	17,031	(26,517)
Cash and due from banks at beginning of period	539,741	534,086
Cash and due from banks at end of period	556,772	507,569
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Transfers of loans to other real estate	21,891	21,280
Dividends declared but not paid	3,603	3,603
Unsettled sales of investment securities	0	361,225
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 84,509	$ 0