CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 113,330	$ 41,965
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,798	7,247
Stock-based compensation	4,033	7,395
Provision for credit losses	8,000	10,948
Net amortization of premiums and accretion of discounts on securities and borrowings	7,560	8,495
Amortization of other intangible assets	4,311	4,293
Losses on securities transactions, net	32	765
Proceeds from sales of loans held for sale	196,165	237,360
Gains on sales of loans, net	(4,576)	(6,753)
Originations of loans held for sale	(89,564)	(227,660)
(Gains) losses on sales of assets, net	(77,720)	97
Net change in:
Cash surrender value of bank owned life insurance	(1,887)	(1,763)
Accrued interest receivable	(5,426)	(691)
Other assets	(38,990)	19,480
Accrued expenses and other liabilities	65,212	(15,295)
Net cash provided by operating activities	193,278	85,883
Cash flows from investing activities:
Net loan originations and purchases	(493,689)	(475,346)
Investment securities held to maturity:
Purchases	(77,670)	(52,945)
Maturities, calls and principal repayments	68,165	58,227
Investment securities available for sale:
Purchases	0	(174,047)
Sales	0	38,625
Maturities, calls and principal repayments	45,351	60,858
Death benefit proceeds from bank owned life insurance	644	560
Proceeds from sales of real estate property and equipment	101,916	7,378
Purchases of real estate property and equipment	(3,817)	(4,260)
Cash and cash equivalents acquired in acquisition	0	156,612
Net cash used in investing activities	(359,100)	(384,338)
Cash flows from financing activities:
Net change in deposits	454,522	241,541
Net change in short-term borrowings	(56,338)	219,809
Repayments of long-term borrowings	(155,000)	(50,000)
Cash dividends paid to preferred shareholders	0	(3,172)
Cash dividends paid to common shareholders	(37,053)	(29,611)
Purchase of common shares to treasury	(1,367)	(2,083)
Common stock issued, net	(855)	2,521
Other, net	(119)	0
Net cash provided by financing activities	203,790	379,005
Net change in cash and cash equivalents	37,968	80,550
Cash and cash equivalents at beginning of year	428,629	416,110
Cash and cash equivalents at end of period	466,597	496,660
Cash payments for:
Interest on deposits and borrowings	93,405	58,881
Federal and state income taxes	3,204	8,843
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	730	145
Transfer of loans to loans held for sale	99,976	150,522
Lease right of use assets obtained in exchange for operating lease liabilities	289,669
Non-cash assets acquired:
Loans	0	3,736,984
Premises and equipment	0	62,066
Bank owned life insurance	0	49,052
Accrued interest receivable	0	12,123
Goodwill	0	394,028
Other intangible assets	0	45,906
Other assets	0	100,059
Total non-cash assets acquired	0	4,922,820
Liabilities assumed:
Deposits	0	3,564,843
Short-term borrowings	0	649,979
Long-term borrowings	0	87,283
Junior subordinated debentures issued to capital trusts	0	13,249
Accrued expenses and other liabilities	0	26,848
Total liabilities assumed	0	4,342,202
Net non-cash assets acquired	0	580,618
Net cash and cash equivalents acquired in acquisition	0	156,612
Common stock issued in acquisition	0	737,230
Investment securities held to maturity
Non-cash assets acquired:
Investment securities	0	214,217
Investment securities available for sale
Non-cash assets acquired:
Investment securities	$ 0	$ 308,385