Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 23,972	$ 21,216
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	1,500	1,800
Depreciation, amortization and accretion	11,566	739
Deferred income tax expense	3,946	2,832
Funding of mortgage loans held for sale	(318,144)	(458,500)
Proceeds from sales of mortgage loans held for sale	343,945	391,552
Gains on sales of mortgage loans held for sale	(6,554)	(5,847)
Losses on sales of securities	0	71
Penalty on extinguishment of debt	205	0
Losses on sales of premises and equipment	512	5
Stock-based compensation	1,174	859
Decrease in FDIC loss-share indemnification asset, net of accretion	0	1,067
Decrease in other assets	18,882	11,827
Decrease in other liabilities	(14,662)	(8,298)
Net cash provided by (used in) operating activities	66,342	(40,677)
Investing activities
Purchases of securities available for sale	(52,683)	(32,396)
Proceeds from sales of securities available for sale	2,946	4
Proceeds from call/maturities of securities available for sale	30,800	29,803
Purchases of securities held to maturity	0	(5,785)
Proceeds from call/maturities of securities held to maturity	7,710	15,193
Net increase in loans	(43,182)	(157,198)
Purchases of premises and equipment	(4,441)	(2,656)
Proceeds from sales of premises and equipment	13	0
Proceeds from sales of other assets	5,307	3,611
Net cash used in investing activities	(53,530)	(149,424)
Financing activities
Net increase in noninterest-bearing deposits	18,224	106,166
Net increase in interest-bearing deposits	154,001	106,105
Net decrease in short-term borrowings	(99,721)	(8,024)
Repayment of long-term debt	(10,790)	(938)
Cash paid for dividends	(8,030)	(6,892)
Net stock-based compensation transactions	(1,976)	382
Excess tax benefit from stock-based compensation	0	214
Net cash provided by financing activities	51,708	197,013
Net increase in cash and cash equivalents	64,520	6,912
Cash and cash equivalents at beginning of period	306,224	211,571
Cash and cash equivalents at end of period	370,744	218,483
Supplemental disclosures
Cash paid for interest	9,635	6,297
Cash paid for income taxes	7,181	5,460
Noncash transactions:
Transfers of loans to other real estate owned	3,168	1,954
Financed sales of other real estate owned	237	92
Transfers of loans held for sale to loan portfolio	$ 0	$ 6,610