Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net income	$ 67,295	$ 46,854
Adjustments to reconcile net income to net cash used in operating activities, net of effects from acquisitions:
Provision for loan losses	5,880	3,000
Depreciation, amortization and accretion	839	5,053
Deferred income tax expense	5,663	3,794
Funding of mortgage loans held for sale	(1,516,650)	(992,555)
Proceeds from sales of mortgage loans held for sale	1,579,476	1,069,625
Gains on sales of mortgage loans held for sale	(26,687)	(20,618)
Gains on sales of securities	(1,186)	(96)
Penalty on extinguishment of debt	2,539	0
Losses on sales of premises and equipment	105	37
Stock-based compensation	2,563	2,739
Decrease in FDIC loss-share indemnification asset, net of accretion	2,442	5,202
Decrease in other assets	7,556	17,182
Decrease in other liabilities	(5,097)	(11,047)
Net cash provided by operating activities	124,738	129,170
Investing activities
Purchases of securities available for sale	(82,243)	(54,256)
Proceeds from sales of securities available for sale	4,028	8,444
Proceeds from call/maturities of securities available for sale	117,232	83,488
Purchases of securities held to maturity	(10,644)	(137,776)
Proceeds from call/maturities of securities held to maturity	109,305	121,438
Net increase in loans	(407,570)	(177,740)
Purchases of premises and equipment	(8,958)	(19,364)
Proceeds from sales of premises and equipment	2,462	448
Proceeds from sales of other assets	11,040	0
Net cash received in acquisition of businesses	25,263	35,787
Net cash used in investing activities	(240,085)	(139,531)
Financing activities
Net increase in noninterest-bearing deposits	163,406	107,728
Net increase (decrease) in interest-bearing deposits	85,005	(85,693)
Net (decrease) increase in short-term borrowings	(157,685)	355,063
Proceeds from long-term borrowings	98,434	42
Repayment of long-term debt	(46,964)	(307,230)
Cash paid for dividends	(22,108)	(17,681)
Cash received on exercise of stock options	415	102
Excess tax benefit from stock-based compensation	664	296
Net cash provided by financing activities	121,167	52,627
Net increase in cash and cash equivalents	5,820	42,266
Cash and cash equivalents at beginning of period	211,571	161,583
Cash and cash equivalents at end of period	217,391	203,849
Supplemental disclosures
Cash paid for interest	19,658	15,936
Cash paid for income taxes	22,731	10,768
Noncash transactions:
Transfers of loans to other real estate owned	5,147	12,268
Financed sales of other real estate owned	538	1,017
Transfers of loans held for sale to loan portfolio	15,455	0
Common stock issued in acquisition of businesses	$ 55,290	$ 281,530