Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net earnings	$ 172,315	$ 172,624
Depreciation and amortization	15,980	16,522
Amortization of net premiums on securities available-for-sale	20,227	18,174
Amortization of intangible assets	6,129	9,117
Provision for credit losses	36,227	34,043
Gain on sale of foreclosed assets	(282)	(534)
Provision for losses on foreclosed assets	14	0
Gain on sale of loans and leases	(1,361)	(633)
Gain on sale of premises and equipment	(565)	(23)
Gain on sale of securities	(1,552)	(8,588)
Gain on BOLI death benefit	(1,050)	(538)
Unrealized gain on derivatives and foreign currencies, net	(253)	(569)
Earned stock compensation	13,719	11,600
Loss on sale of PWEF leasing unit	0	720
Tax effect included in stockholders' equity of restricted stock vesting	0	(3,683)
Decrease in accrued and deferred income taxes, net	7,823	68,466
Increase in other assets	(50,973)	(3,031)
Decrease in accrued interest payable and other liabilities	(31,195)	(40,683)
Net cash provided by operating activities	185,203	272,984
Cash flows from investing activities:
Net increase in loans and leases	(388,619)	(380,289)
Proceeds from sales of loans and leases	83,798	78,888
Proceeds from maturities and paydowns of securities available-for-sale	217,399	117,684
Proceeds from sales of securities available-for-sale	86,018	353,374
Purchases of securities available-for-sale	(532,849)	(177,644)
Net purchases of Federal Home Loan Bank stock	(189)	(4,504)
Proceeds from sales of foreclosed assets	1,281	6,602
Purchases of premises and equipment, net	(4,037)	(3,951)
Proceeds from sales of premises and equipment	10,306	24
Proceeds from sale of leasing unit	0	138,955
Proceeds from BOLI death benefit	2,478	3,034
Net decrease (increase) of equipment leased to others under operating leases	17,262	(16,060)
Net cash (used in) provided by investing activities	(507,152)	116,113
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	44,996	53,387
Net increase (decrease) in interest-bearing deposits	962,343	(569,414)
Net (decrease) increase in borrowings	(688,358)	298,324
Restricted stock surrendered	(7,558)	(4,416)
Tax effect included in stockholders' equity of restricted stock vesting	0	3,683
Cash dividends paid	(121,664)	(121,794)
Net cash provided by (used in) financing activities	189,759	(340,230)
Net (decrease) increase in cash and cash equivalents	(132,190)	48,867
Cash and cash equivalents, beginning of period	419,670	396,486
Cash and cash equivalents, end of period	287,480	445,353
Supplemental disclosures of cash flow information:
Cash paid for interest	30,478	28,558
Cash paid for income taxes	118,878	44,908
Loans transferred to foreclosed assets	580	129
Transfers from loans held for investment to loans held for sale	$ 175,158	$ 0