Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net earnings	$ 299,619	$ 168,905	$ 45,115
Depreciation and amortization	53,970	39,153	31,509
Provision (negative provision) for credit losses	45,481	11,499	(4,210)
Gain on sale of foreclosed assets, net	(2,967)	(3,413)	(5,201)
Provision for losses on foreclosed assets	5,228	7,307	2,515
Gain on sale of loans and leases, net	(373)	(601)	(1,791)
Gain on sale of premises and equipment	(28)	(1,520)	(21)
Gain on securities, net	(3,744)	(4,841)	(5,359)
Unrealized gain on derivatives and foreign currencies, net	(160)	(3,487)	0
Earned stock compensation	15,630	36,474	21,246
Write-off of goodwill relating to the asset financing segment reorganization	0	6,645	0
Tax effect included in stockholders' equity of restricted stock vesting	(841)	(4,625)	(2,133)
Decrease (increase) in deferred income taxes, net	149,664	92,257	2,198
Decrease (increase) in other assets	48,172	49,498	19,789
Decrease in accrued interest payable and other liabilities	(15,773)	(61,141)	(53,405)
Net cash provided by operating activities	593,878	332,110	50,252
Cash flows from investing activities:
Cash acquired in acquisitions, net of cash consideration paid	260,936	346,047	273,013
Net (increase) decrease in loans and leases	(1,105,925)	(782,424)	275,740
Proceeds from sale of loans and leases	31,993	66,596	33,824
Proceeds from maturities and paydowns	144,847	123,949	306,536
Proceeds from sales	1,035,926	465,608	22,415
Purchases	(992,680)	(236,739)	(550,211)
Collection of securities sales proceeds	0	484,084	0
Net redemptions of Federal Home Loan Bank stock	23,686	33,390	18,705
Proceeds from sales of foreclosed assets	32,812	24,464	36,490
Purchases of premises and equipment, net	(8,929)	(2,669)	(3,604)
Proceeds from sales of premises and equipment	146	3,759	31
Net (increase) decrease of equipment leased to others under operating leases	(65,309)	30,493	0
Net cash (used in) provided by investing activities	(642,497)	556,558	412,939
Cash flows from financing activities:
Noninterest-bearing	685,742	506,533	18,068
Interest-bearing	(569,706)	(375,185)	(547,081)
Net increase in borrowings	238,512	269,741	101,250
Restricted stock surrendered	(8,400)	(22,307)	(13,537)
Repayment of acquired debt	0	(992,109)	0
Tax effect included in stockholders' equity of restricted vesting stock	841	4,625	2,133
Cash dividends paid, net	(215,110)	(114,162)	(41,006)
Net cash provided by (used in) financing activities	131,879	(722,864)	(480,173)
Net increase (decrease) in cash and cash equivalents	83,260	165,804	(16,982)
Cash and cash equivalents, beginning of year	313,226	147,422	164,404
Cash and cash equivalents, end of year	396,486	313,226	147,422
Supplemental disclosures of cash flow information:
Cash paid for interest	65,868	34,788	13,275
Cash paid (received) for income taxes	16,602	(1,198)	27,665
Loans transferred to foreclosed assets	13,472	9,806	15,416
Partnership interest transferred to equipment leased to others under operating leases	20,833	0	0
Common stock issued in acquisitions	$ 797,433	$ 2,594,070	$ 242,268