CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 189,798	$ 114,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,240	13,783
Stock-based compensation	8,282	12,153
Provision for credit losses	10,100	18,090
Net amortization of premiums and accretion of discounts on securities and borrowings	14,287	17,212
Amortization of other intangible assets	8,481	8,910
Losses on securities transactions, net	21	801
Proceeds from sales of loans held for sale	421,730	437,876
Gains on sales of loans, net	(8,506)	(14,395)
Net impairment losses on securities, recognized in earnings	2,928	0
Originations of loans held for sale	(200,877)	(446,849)
(Gains) losses on sales of assets, net	(77,156)	222
Net change in:
Cash surrender value of bank owned life insurance	(4,092)	(4,415)
Accrued interest receivable	(3,769)	(2,042)
Other assets	(186,674)	(55,464)
Accrued expenses and other liabilities	65,970	(16,281)
Net cash provided by operating activities	265,763	84,368
Cash flows from investing activities:
Net loan originations and purchases	(992,236)	(1,158,514)
Investment securities held to maturity:
Purchases	(261,446)	(100,160)
Maturities, calls and principal repayments	155,002	120,876
Investment securities available for sale:
Purchases	0	(239,226)
Sales	0	38,625
Maturities, calls and principal repayments	109,045	124,635
Death benefit proceeds from bank owned life insurance	1,350	2,652
Proceeds from sales of real estate property and equipment	102,500	9,773
Purchases of real estate property and equipment	(9,336)	(12,811)
Cash and cash equivalents acquired in acquisition	0	156,612
Net cash used in investing activities	(895,121)	(1,057,538)
Cash flows from financing activities:
Net change in deposits	320,955	(77,533)
Net change in short-term borrowings	268,870	1,479,305
Advances of long-term borrowings	400,000	0
Repayments of long-term borrowings	(255,000)	(300,027)
Cash dividends paid to preferred shareholders	(3,172)	(6,344)
Cash dividends paid to common shareholders	(73,546)	(65,989)
Purchase of common shares to treasury	(1,462)	(2,598)
Common stock issued, net	(480)	2,512
Other, net	(240)	0
Net cash provided by financing activities	655,925	1,029,326
Net change in cash and cash equivalents	26,567	56,156
Cash and cash equivalents at beginning of year	428,629	416,110
Cash and cash equivalents at end of period	455,196	472,266
Cash payments for:
Interest on deposits and borrowings	198,815	124,816
Federal and state income taxes	80,116	29,280
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	1,016	672
Transfer of loans to loans held for sale	216,211	263,324
Lease right of use assets obtained in exchange for operating lease liabilities	296,064
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