Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net earnings	$ 227,778	$ 97,906
Depreciation and amortization	33,239	28,434
Provision for credit losses	31,709	9,436
Loss (gain) on sale of foreclosed assets	42	(2,746)
Provision for losses on foreclosed assets	5,163	5,065
Gain On Sale of Non-PCI Loans and Leases	(190)	(594)
Gain on sale of premises and equipment	(54)	(1,523)
Gain on sale of securities	(3,744)	(4,841)
Unrealized gain on derivatives and foreign currencies, net	(909)	(2,393)
Earned stock compensation	11,836	33,641
Goodwill, Written off Related to Sale of Business Unit	0	6,645
Tax effect included in stockholders' equity of restricted stock vesting	(596)	(4,402)
Decrease in accrued and deferred income taxes, net	108,553	47,938
Decrease in other assets	15,786	14,341
Decrease in accrued interest payable and other liabilities	(25,336)	(79,644)
Net cash provided by operating activities	403,277	147,263
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	(612,008)	(433,525)
Proceeds from sales of loans and leases	10,557	35,696
Proceeds from maturities and paydowns	93,389	95,039
Proceeds from sales	212,169	465,608
Purchases	(557,769)	(186,969)
Collections of securities sales proceeds receivable	0	484,084
Net redemptions of Federal Home Loan Bank stock	23,359	28,397
Proceeds from sales of foreclosed assets	18,772	20,097
Purchases of premises and equipment, net	(5,872)	(2,283)
Proceeds from sales of premises and equipment	108	3,759
Net (increase) decrease of equipment leased to others under operating leases	(26,174)	30,502
Net cash (used in) provided by investing activities	(843,469)	886,452
Net Cash Provided by (Used in) Financing Activities [Abstract]
Noninterest-bearing	573,101	420,478
Interest-bearing	(216,717)	(518,012)
Net increase (decrease) in borrowings	169,095	(742,109)
Restricted stock surrendered	(8,391)	(22,307)
Tax effect included in stockholders' equity of restricted vesting stock	596	4,402
Cash dividends paid	(154,424)	(62,727)
Net cash provided by (used in) financing activities	363,260	(920,275)
Net (decrease) increase in cash and cash equivalents	(76,932)	113,440
Cash and cash equivalents at beginning of period	313,226	147,422
Cash and cash equivalents at end of period	236,294	260,862
Noncash transactions from investing activities:
Cash paid for interest	51,218	23,959
Cash paid (received) for income taxes	13,760	(3,829)
Loans transferred to foreclosed assets	13,472	667
Partnership interest transferred to equipment leased to others under operating leases	20,833	0
Common stock issued in acquisitions	$ 0	$ 2,594,070