Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 140,077	$ 60,864
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	15,778	8,603
Gain on sales of loans	(26,537)	(8,957)
Proceeds from sales of loans	601,694	287,295
Loans originated for sale	(577,874)	(299,156)
Net gains on sale of investment securities	(168)	(53)
Net gains from sales/writedowns of other real estate and repossessed assets	(597)	(3,150)
Depreciation of premises and equipment	13,444	8,925
Amortization of intangible assets	4,564	6,736
Additions to loan servicing rights	(6,461)	(2,422)
Valuation change in loan servicing rights	8,242	1,558
Net amortization of premiums and discounts on investment securities	13,933	5,211
Share-based compensation expense	14,573	6,454
Deferred income tax expense	36,568	5,889
Net increase in interest receivable and other assets	(148,037)	(37,836)
Net increase (decrease) in interest payable and other liabilities	40,181	(35,081)
Net cash provided by operating activities	129,380	4,880
Investment securities – available-for-sale:
Proceeds from maturities, calls and principal reductions	227,854	157,125
Proceeds from sales and redemptions	17,085	7,820
Purchases	(1,041,744)	(104,657)
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	73,762	71,226
Purchases	(109,704)	(124,492)
Net increase in loans	(862,498)	(575,963)
Proceeds from sales of other real estate and repossessed assets	15,569	10,989
Purchases of premises and equipment, net of disposals	(11,616)	(10,196)
Cash acquired, net of cash paid, in business combinations	0	325,714
Net cash used in investing activities	(1,691,292)	(242,434)
Cash flows from financing activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	828,517	734,330
Net increase (decrease) in time deposits	103,606	(213,105)
Net increase in securities sold under agreements to repurchase with customers and other short-term borrowings	1,146,550	9,886
Proceeds from issuance of long-term borrowings	0	275,000
Repayment of long-term borrowings	(200,000)	(223,018)
Cash dividends paid	(58,504)	(30,293)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	3,353	3,595
Cash paid for payroll taxes upon conversion of share-based awards	(26,801)	(1,063)
Net cash provided by financing activities	1,796,721	555,332
Net increase in cash and cash equivalents	234,809	317,778
Cash and cash equivalents at beginning of period	474,402	238,789
Cash and cash equivalents at end of period	709,211	556,567
Supplemental disclosures of cash flow information:
Interest paid	51,505	13,810
Net income tax payments	9,922	22,200
Non-cash activities:
Loans transferred to other real estate and repossessed assets	8,972	6,029
Net transfer of loans held-for-sale to loans held- for-investment	(2,651)	0
Closed branch offices transferred to other assets	1,634	2,136
Business combinations:
Fair value of tangible assets acquired (noncash)	420	6,374,784
Goodwill, loans servicing rights and other identifiable intangible assets acquired	1,034	905,160
Liabilities assumed	1,454	6,100,847
Common stock and stock options issued	$ 0	$ 1,504,811