Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net earnings	$ 158,162	$ 35,635
Depreciation and amortization	22,087	18,023
Provision for credit losses	22,963	4,386
Loss (gain) on sale of foreclosed assets	126	(2,699)
Provision for losses on foreclosed assets	406	368
(Gain) loss on sale of loans and leases	(163)	379
Gain on sale of premises and equipment	(11)	(1,571)
Gain on securities	(3,089)	(4,841)
Unrealized (gain) loss on derivatives and foreign currencies, net	(1,226)	14
Earned stock compensation	8,074	30,696
Write-off of goodwill relating to the asset financing segment reorganization	0	6,645
Tax effect included in stockholders' equity of restricted stock vesting	(401)	(4,294)
Decrease in accrued and deferred income taxes, net	72,169	25,141
Decrease in other assets	26,443	32,585
Decrease in accrued interest payable and other liabilities	(26,541)	(87,303)
Net cash provided by operating activities	278,999	53,164
Net Cash Provided by (Used in) Investing Activities [Abstract]
Cash acquired in acquisitions, net of cash consideration	0	346,047
Net increase in loan and leases	(169,071)	(18,989)
Proceeds from sales of loans and leases	3,784	22,711
Proceeds from maturities and paydowns	63,741	61,914
Proceeds from sales	159,548	466,534
Purchases	(375,156)	(163,421)
Collections of securities sales proceeds	0	482,724
Net redemptions of Federal Home Loan Bank stock	23,359	24,016
Proceeds from sales of foreclosed assets	14,610	11,450
Purchases of premises and equipment, net	(3,407)	(1,967)
Proceeds from sales of premises and equipment	63	3,753
Increase (Decrease) in Leasing Receivables	0	30,462
Net cash (used in) provided by investing activities	(282,529)	1,265,234
Net Cash Provided by (Used in) Financing Activities [Abstract]
Noninterest-bearing	461,107	286,370
Interest-bearing	361,330	(232,598)
Net decrease in borrowings	(380,651)	(1,101,197)
Restricted stock surrendered	(8,336)	(22,307)
Tax effect included in stockholders' equity of restricted vesting stock	401	4,294
Cash dividends paid	(102,916)	(37,017)
Net cash provided by (used in) financing activities	330,935	(1,102,455)
Net increase in cash and cash equivalents	327,405	215,943
Cash and Cash Equivalents, Beginning Balance	313,226	147,422
Cash and Cash Equivalents, Ending Balance	640,631	363,365
Noncash transactions from investing activities:
Cash paid for interest	29,006	12,437
Cash paid (received) for income taxes	6,076	(12,613)
Loans transferred to foreclosed assets	3,089	667
Stock Issued	$ 0	$ 2,594,070