Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net earnings	$ 168,905	$ 45,115	$ 56,801
Depreciation and amortization	39,153	31,509	25,792
Provision (negative provision) for credit losses	11,499	(4,210)	(12,819)
Gain on sale of foreclosed assets,net	(3,413)	(5,201)	(5,786)
Provision for losses on foreclosed assets	7,307	2,515	14,333
Gain on sale of loans and leases, net	(601)	(1,791)	(2,767)
(Gain) loss on sale of premises and equipment	(1,520)	(21)	155
Gain on branch sale	0	0	(297)
Gain on securities, net	(4,841)	(5,359)	(1,239)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent	0	0	1,115
Unrealized gain on derivatives and foreign currencies, net	(3,487)	0	0
Earned stock compensation	36,474	21,246	5,999
Write-off of goodwill relating to the asset financing segment reorganization	6,645	0	0
Tax effect included in stockholders' equity of restricted stock vesting	(4,625)	(2,133)	(283)
Decrease (increase) in deferred income taxes, net	92,257	2,198	(3,737)
Decrease (increase) in other assets	26,790	29,192	37,712
Decrease (increase) in other assets	22,708	(9,403)	18,754
Decrease in accrued interest payable and other liabilities	(61,141)	(53,405)	(15,753)
Net cash provided by operating activities	332,110	50,252	117,980
Cash flows from investing activities:
Cash acquired in acquisitions, net of cash consideration paid	346,047	273,013	(87,098)
Net cash used in branch sale	0	0	(119,756)
Net (increase) decrease in loans and leases	(782,424)	275,740	232,549
Proceeds from sale of loans and leases	66,596	33,824	58,691
Proceeds from maturities and paydowns	123,949	306,536	415,854
Proceeds from sales	465,608	22,415	90,745
Purchases	(236,739)	(550,211)	(485,860)
Collection of securities sales proceeds	484,084	0	0
Net redemptions of Federal Home Loan Bank stock	33,390	18,705	10,392
Proceeds from sales of foreclosed assets	24,464	36,490	59,614
Purchases of premises and equipment, net	(2,669)	(3,604)	(4,914)
Proceeds from sales of premises and equipment	3,759	31	704
Net decrease of equipment leased to others under operating leases	30,493
Net cash provided by investing activities	556,558	412,939	170,921
Cash flows from financing activities:
Noninterest-bearing	506,533	18,068	271,934
Interest-bearing	(375,185)	(547,081)	(234,608)
Net increase (decrease) in borrowings	269,741	101,250	(228,107)
Restricted stock surrendered	(22,307)	(13,537)	(1,475)
Redemption of subordinated debentures	0	0	(18,558)
Repayment of acquired debt	(992,109)	0	(180,796)
Tax effect included in stockholders' equity of restricted vesting stock	4,625	2,133	283
Cash dividends paid, net	(114,162)	(41,006)	(28,787)
Net cash used in financing activities	(722,864)	(480,173)	(420,114)
Net increase (decrease) in cash and cash equivalents	165,804	(16,982)	(131,213)
Cash and cash equivalents, beginning of year	147,422	164,404	295,617
Cash and cash equivalents, end of year	313,226	147,422	164,404
Supplemental disclosures of cash flow information:
Cash paid for interest	34,788	13,275	21,614
Cash (received) paid for income taxes	(1,198)	27,665	40,772
Loans transferred to foreclosed assets	9,806	15,416	40,207
Common stock issued in acquisitions	$ 2,594,070	$ 242,268	$ 0