Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net income	$ 68,014	$ 59,582	$ 33,487
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,750	6,167	10,350
Depreciation, amortization and accretion	5,953	8,104	9,096
Deferred income tax expense (benefit)	13,751	9,291	(285)
Funding of mortgage loans held for sale	(1,483,937)	(547,402)	(619,526)
Proceeds from sales of mortgage loans held for sale	1,647,648	563,808	625,749
Gains on sales of mortgage loans held for sale	(25,292)	(8,594)	(11,573)
Gains on sales of securities	(96)	(375)	(54)
Losses (gains) on sales of premises and equipment	105	(72)	58
Stock-based compensation	4,435	3,909	2,806
Decrease in FDIC loss-share indemnification asset, net of accretion	4,409	14,399	26,308
Decrease in other assets	12,705	21,303	73,733
Increase (decrease) in other liabilities	180	(5,437)	3,137
Net cash provided by operating activities	252,625	124,683	153,286
Investing activities
Purchases of securities available for sale	(72,114)	(124,296)	(163,146)
Proceeds from sales of securities available for sale	8,444	1,099	9,015
Proceeds from call/maturities of securities available for sale	111,663	80,305	80,758
Purchases of securities held to maturity	(144,027)	(155,868)	(70,075)
Proceeds from sales of securities held to maturity	0	0	4,459
Proceeds from call/maturities of securities held to maturity	145,449	136,013	112,283
Net increase in loans	(298,676)	(120,787)	(192,399)
Purchases of premises and equipment	(25,165)	(22,179)	(8,050)
Proceeds from sales of premises and equipment	2,219	2,911	0
Net cash received in acquisition	24,776	0	170,005
Net cash used in investing activities	(247,431)	(202,802)	(57,150)
Financing activities
Net increase in noninterest-bearing deposits	79,342	63,852	652
Net (decrease) increase in interest-bearing deposits	(77,124)	(67,346)	54,009
Net increase (decrease) in short-term borrowings	375,220	30,120	(9,760)
Proceeds from long-term debt	40	0	0
Repayment of long-term debt	(308,766)	(13,557)	(8,073)
Cash paid for dividends	(24,557)	(21,518)	(19,303)
Cash received on exercise of stock options	102	401	277
Excess tax benefits from exercise of stock options	537	1,102	290
Net cash provided by (used in) financing activities	44,794	(6,946)	18,092
Net increase (decrease) in cash and cash equivalents	49,988	(85,065)	114,228
Cash and cash equivalents at beginning of year	161,583	246,648	132,420
Cash and cash equivalents at end of year	211,571	161,583	246,648
Supplemental disclosures
Cash paid for interest	21,615	24,103	23,302
Cash paid for income taxes	18,610	17,503	12,771
Noncash transactions:
Transfers of loans to other real estate	14,935	15,692	13,747
Financed sales of other real estate owned	$ 1,134	$ 860	$ 6,912