CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 271,689	$ 184,326
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,329	20,367
Stock-based compensation	11,504	15,840
Provision for credit losses	18,800	24,642
Net amortization of premiums and accretion of discounts on securities and borrowings	21,584	26,262
Amortization of other intangible assets	13,175	13,607
Losses on securities transactions, net	114	880
Proceeds from sales of loans held for sale	644,454	591,583
Gains on sales of loans, net	(13,700)	(18,143)
Net impairment losses on securities recognized in earnings	2,928	0
Originations of loans held for sale	(338,996)	(307,623)
(Gains) losses on sales of assets, net	(76,997)	2,121
Net change in:
Cash surrender value of bank owned life insurance	(6,779)	(6,960)
Accrued interest receivable	(1,986)	(6,553)
Other assets	(264,228)	(39,119)
Accrued expenses and other liabilities	92,542	(5,941)
Net cash provided by operating activities	412,433	495,289
Cash flows from investing activities:
Net loan originations and purchases	(1,846,329)	(2,324,977)
Investment securities held to maturity:
Purchases	(317,794)	(220,192)
Maturities, calls and principal repayments	281,961	195,448
Investment securities available for sale:
Purchases	(19,892)	(239,226)
Sales	0	38,625
Maturities, calls and principal repayments	188,619	194,312
Death benefit proceeds from bank owned life insurance	6,354	2,546
Proceeds from sales of real estate property and equipment	107,132	6,665
Purchases of real estate property and equipment	(15,753)	(16,880)
Cash and cash equivalents acquired in acquisition	0	156,612
Net cash used in investing activities	(1,615,702)	(2,207,067)
Cash flows from financing activities:
Net change in deposits	1,093,148	869,967
Net change in short-term borrowings	(293,497)	1,569,824
Advances of long-term borrowings	850,000	0
Repayments of long-term borrowings	(255,000)	(675,682)
Cash dividends paid to preferred shareholders	(9,516)	(9,516)
Cash dividends paid to common shareholders	(110,037)	(102,414)
Purchase of common shares to treasury	(1,505)	(2,780)
Common stock issued, net	(351)	2,648
Other, net	(365)	0
Net cash provided by financing activities	1,272,877	1,652,047
Net change in cash and cash equivalents	69,608	(59,731)
Cash and cash equivalents at beginning of year	428,629	416,110
Cash and cash equivalents at end of period	498,237	356,379
Cash payments for:
Interest on deposits and borrowings	312,663	205,821
Federal and state income taxes	106,296	47,217
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	1,453	697
Transfer of loans to loans held for sale	302,861	289,633
Lease right of use assets obtained in exchange for operating lease liabilities	306,471
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