Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 80,049	$ 167,492
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	175,669	23,691
Share-based compensation expense	17,353	3,507
Depreciation and amortization	204,393	111,022
Provision for deferred income taxes	18,606	28,693
Net gains on sales of assets	(66,664)	(34,648)
Proceeds from sales of loans and leases held-for-sale	640,607	178,802
Originations of loans and leases held-for-sale, net of repayments	(961,255)	(185,848)
Impairment of loan servicing rights	17,094	0
Net change in other assets	(570,337)	6,550
Net change in other liabilities	(60,568)	(57,840)
Other, net	(21,345)	(23,289)
Net cash provided by (used in) operating activities	(526,398)	218,132
Cash flows from investing activities
Proceeds from sales of investment securities available-for-sale	0	408,230
Proceeds from maturities of and principal collected on investment securities available-for-sale	920,147	143,890
Purchases of investment securities available-for-sale	(896,547)	(1,146,821)
Proceeds from maturities of and principal collected on investment securities held-to-maturity	10,417	5,708
Purchases of investment securities held-to-maturity	0	(821)
Redemption of Federal Home Loan Bank stock	258,014	68,000
Purchases of Federal Home Loan Bank stock	(202,000)	(82,000)
Proceeds from sales of loans and leases	493,779	414,974
Loan and lease originations and purchases, net of principal collected	(1,562,372)	(556,311)
Proceeds from sales of other assets	34,311	49,996
Purchases of premises and equipment and lease equipment	(42,606)	(68,284)
Other, net	15,758	3,034
Net cash provided by (used in) investing activities	(971,099)	(760,405)
Cash flows from financing activities
Net change in deposits	4,811,953	230,161
Net change in short-term borrowings	103,914	350,765
Proceeds from long-term borrowings	4,950,000	1,737,159
Payments on long-term borrowings	(6,365,249)	(1,724,630)
Payments on liabilities related to acquisition and portfolio purchase	0	(1,000)
Repurchases of common stock	(33,098)	(22,962)
Dividends paid on preferred stock	(4,987)	(4,987)
Dividends paid on common stock	(107,300)	(48,620)
Exercise of stock options	(110)	0
Payments related to tax-withholding upon conversion of share-based awards	(3,934)	(5,227)
Net investment by non-controlling interest	(1,386)	(172)
Net cash provided by (used in) financing activities	3,349,803	510,487
Net change in cash and due from banks	1,852,306	(31,786)
Cash and cash equivalents at beginning of period	1,228,371	587,057
Cash and cash equivalents at end of period	3,080,677	555,271
Cash paid (received) for:
Interest on deposits and borrowings	151,791	103,413
Income taxes, net	5,483	7,374
Noncash activities:
Transfer of loans and leases to other assets	24,483	48,025
Transfer of loans and leases from held-for-investment to held for sale, net	$ 444,905	$ 375,084