Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net (loss) earnings	$ (1,399,907)	$ 240,729
Goodwill impairment	1,470,000	0
Depreciation and amortization	22,124	18,607
Amortization of net premiums on securities available-for-sale	5,591	7,933
Amortization of intangible assets	7,830	9,740
Amortization of operating lease ROU assets	14,662	14,723
Provision for credit losses	232,000	12,000
Gain on sale of foreclosed assets	(112)	(320)
Provision for losses on foreclosed assets	110	0
Gain on sale of loans and leases	(433)	(326)
Loss (gain) on sale of premises and equipment	187	(37)
Gain on sale of securities	(7,897)	(24,353)
Unrealized loss (gain) on derivatives and foreign currencies, net	564	(40)
Earned stock compensation	12,783	12,529
Decrease in other assets	8,393	44,349
Decrease in accrued interest payable and other liabilities	(91,873)	(55,550)
Net cash provided by operating activities	274,022	279,984
Cash flows from investing activities:
Net increase in loans and leases	(887,247)	(605,228)
Proceeds from sales of loans and leases	3,522	80,440
Proceeds from maturities and paydowns of securities available-for-sale	170,245	150,766
Proceeds from sales of securities available-for-sale	144,997	1,410,510
Purchases of securities available-for-sale	(274,824)	(1,232,214)
Net redemptions (purchases) of Federal Home Loan Bank stock	23,674	(11,043)
Proceeds from sales of foreclosed assets	769	4,184
Purchases of premises and equipment, net	(9,772)	(8,621)
Proceeds from sales of premises and equipment	2	54
Proceeds from BOLI death benefit	761	555
Net decrease (increase) in equipment leased to others under operating leases	15,147	(18,986)
Net cash used in investing activities	(812,726)	(229,583)
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposits	1,387,698	(588,417)
Net increase in interest-bearing deposits	2,309,298	524,957
Net (decrease) increase in borrowings	(1,699,008)	541,945
Common stock repurchased and restricted stock surrendered	(75,061)	(161,826)
Cash dividends paid	(100,711)	(145,089)
Net cash provided by financing activities	1,822,216	171,570
Net increase in cash, cash equivalents, and restricted cash	1,283,512	221,971
Cash, cash equivalents, and restricted cash, beginning of period	637,624	385,767
Cash, cash equivalents, and restricted cash, end of period	1,921,136	607,738
Supplemental disclosures of cash flow information:
Cash paid for interest	68,390	97,238
Cash paid for income taxes	3,850	68,305
Loans transferred to foreclosed assets	1,776	37
Transfers from loans held for investment to loans held for sale	$ 0	$ 25,124