Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 49,256	$ 44,116
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	3,250	3,230
Depreciation, amortization and accretion	2,625	1,309
Deferred income tax expense	2,219	3,845
Funding of mortgage loans held for sale	(772,456)	(1,006,507)
Proceeds from sales of mortgage loans held for sale	729,532	968,800
Gains on sales of mortgage loans held for sale	(11,608)	(12,971)
Gains on sales of securities	0	(1,186)
Penalty on prepayment of debt	205	329
Losses on sales of premises and equipment	546	102
Stock-based compensation expense	2,411	1,715
Decrease in FDIC loss-share indemnification asset, net of accretion	0	1,049
Decrease (increase) in other assets	10,428	(6,613)
Decrease in other liabilities	(8,715)	(3,464)
Net cash provided by (used in) operating activities	7,693	(6,246)
Investing activities
Purchases of securities available for sale	(119,766)	(34,651)
Proceeds from sales of securities available for sale	2,946	4,028
Proceeds from call/maturities of securities available for sale	60,928	72,069
Purchases of securities held to maturity	0	(9,073)
Proceeds from call/maturities of securities held to maturity	15,507	81,510
Net increase in loans	(163,349)	(272,514)
Purchases of premises and equipment	(7,668)	(5,651)
Proceeds from sales of premises and equipment	1,255	1,198
Proceeds from sales of other assets	7,385	7,957
Net cash received in acquisition of businesses	0	25,263
Net cash used in investing activities	(202,762)	(129,864)
Financing activities
Net increase in noninterest-bearing deposits	81,506	107,969
Net increase in interest-bearing deposits	62,405	25,791
Net increase in short-term borrowings	10,445	20,361
Proceeds from long-term borrowings	0	277
Repayment of long-term debt	(11,063)	(5,436)
Cash paid for dividends	(16,068)	(14,498)
Net stock-based compensation transactions	(2,319)	401
Excess tax benefit from stock-based compensation	0	482
Net cash provided by financing activities	124,906	135,347
Net decrease in cash and cash equivalents	(70,163)	(763)
Cash and cash equivalents at beginning of period	306,224	211,571
Cash and cash equivalents at end of period	236,061	210,808
Supplemental disclosures
Cash paid for interest	16,155	12,624
Cash paid for income taxes	12,701	16,411
Noncash transactions:
Transfers of loans to other real estate owned	4,227	3,508
Financed sales of other real estate owned	257	150
Transfers of loans held for sale to loan portfolio	0	14,375
Common stock issued in acquisition of businesses	$ 0	$ 55,290