Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 99,618	$ 49,380
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	10,279	4,500
Gain on sales of loans	(20,025)	(3,431)
Proceeds from sales of loans	391,475	119,845
Loans originated for sale	(353,034)	(120,077)
Net gains on sale of investment securities	(167)	(37)
Net gains from sales/writedowns of other real estate and repossessed assets	(871)	(2,512)
Depreciation of premises and equipment	8,989	5,562
Amortization of intangible assets	3,039	4,339
Additions to loan servicing rights	(4,137)	(917)
Valuation change in loan servicing rights	3,591	412
Net amortization of premiums and discounts on investment securities	8,880	2,891
Share-based compensation expense	6,928	1,780
Deferred income tax expense	30,986	0
Net increase in interest receivable and other assets	(105,853)	(12,287)
Net increase (decrease) in interest payable and other liabilities	7,865	(4,139)
Net cash provided by operating activities	87,563	45,309
Investment securities – available-for-sale:
Proceeds from maturities, calls and principal reductions	143,335	94,528
Proceeds from sales and redemptions	10,050	5,000
Purchases	(685,689)	0
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	63,339	57,518
Purchases	(86,340)	(101,295)
Net increase in loans	(689,632)	(385,814)
Proceeds from sales of other real estate and repossessed assets	9,606	6,528
Purchases of premises and equipment, net of disposals	(10,437)	(3,897)
Net cash used in investing activities	(1,245,768)	(327,432)
Cash flows from financing activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	354,480	95,263
Net decrease in time deposits	(23,235)	(87,384)
Net increase in securities sold under agreements to repurchase with customers and other short-term borrowings	1,191,995	159,014
Proceeds from issuance of long-term borrowings	0	150,000
Repayment of long-term borrowings	(162,000)	(20,558)
Cash dividends paid	(38,539)	(19,942)
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	1,639	653
Cash paid for payroll taxes upon conversion of share-based awards	(21,296)	(752)
Net cash provided by financing activities	1,303,044	276,294
Net increase (decrease) in cash and cash equivalents	144,839	(5,829)
Cash and cash equivalents at beginning of period	474,402	238,789
Cash and cash equivalents at end of period	619,241	232,960
Supplemental disclosures of cash flow information:
Interest paid	30,287	10,764
Net income tax (refunds) payments	(4,689)	11,700
Loans transferred to other real estate and repossessed assets	6,332	3,370
Net transfer of loans held-for-sale to loans held- for-investment	(1,957)	0
Closed branch offices transferred to other assets	$ 0	$ 1,863