CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 41,965	$ 46,095
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	7,247	6,260
Stock-based compensation	7,395	4,127
Provision for credit losses	10,948	2,470
Net amortization of premiums and accretion of discounts on securities and borrowings	8,495	6,043
Amortization of other intangible assets	4,293	2,536
Losses on securities transactions, net	765	23
Proceeds from sales of loans held for sale	237,360	161,325
Gains on sales of loans, net	(6,753)	(4,128)
Originations of loans held for sale	(227,660)	(112,682)
Losses on sales of assets, net	97	34
Net change in
Fair value of borrowings hedged by derivative transactions	0	(454)
Cash surrender value of bank owned life insurance	(1,763)	(2,463)
Accrued interest receivable	(691)	(1,429)
Other assets	19,480	(7,103)
Accrued expenses and other liabilities	(15,295)	(35,145)
Net cash provided by operating activities	85,883	65,509
Cash flows from investing activities
Net loan originations and purchases	(475,346)	(323,470)
Investment securities held to maturity
Purchases	(52,945)	(52,160)
Maturities, calls and principal repayments	58,227	77,141
Investment securities available for sale
Purchases	(174,047)	(207,402)
Sales	38,625	0
Maturities, calls and principal repayments	60,858	50,543
Death benefit proceeds from bank owned life insurance	560	1,998
Proceeds from sales of real estate property and equipment	7,378	4,970
Purchases of real estate property and equipment	(4,260)	(5,627)
Cash and cash equivalents acquired in acquisition	156,612	0
Net cash used in investing activities	(384,338)	(454,007)
Cash flows from financing activities
Net change in deposits	241,541	(399,567)
Net change in short-term borrowings	219,809	564,004
Proceeds from issuance of long-term borrowings, net	0	200,000
Repayments of long-term borrowings	(50,000)	0
Cash dividends paid to preferred shareholders	(3,172)	(1,797)
Cash dividends paid to common shareholders	(29,611)	(29,012)
Purchase of common shares to treasury	(2,083)	(2,151)
Common stock issued, net	2,521	1,246
Net cash provided by financing activities	379,005	332,723
Net change in cash and cash equivalents	80,550	(55,775)
Cash and cash equivalents at beginning of year	416,110	392,501
Cash and cash equivalents at end of period	496,660	336,726
Cash payments for
Interest on deposits and borrowings	58,881	56,735
Federal and state income taxes	8,843	1,599
Supplemental schedule of non-cash investing activities
Transfer of loans to other real estate owned	145	4,813
Transfer of loans to loans held for sale	0	103,884
Non-cash assets acquired:
Loans	3,744,682	0
Premises and equipment	62,066	0
Bank owned life insurance	49,052	0
Accrued interest receivable	12,123	0
Goodwill	388,255	0
Other intangible assets	45,906	0
Other assets	98,134	0
Total non-cash assets acquired	4,922,820	0
Liabilities assumed:
Deposits	3,564,843	0
Short-term borrowings	649,979	0
Long-term borrowings	87,283	0
Junior subordinated debentures issued to capital trusts	13,249	0
Accrued expenses and other liabilities	26,848	0
Total liabilities assumed	4,342,202	0
Net non-cash assets acquired	580,618	0
Common stock issued in acquisition	737,230	0
Held-to-maturity Securities
Non-cash assets acquired:
Investment securities	214,217	0
Available for Sale Securities
Non-cash assets acquired:
Investment securities	$ 308,385	$ 0