Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net income	$ 53,816	$ 73,449
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	96,943	10,122
Share-based compensation expense	5,647	224
Depreciation and amortization	99,541	56,284
Provision (benefit) for deferred income taxes	(3,016)	(1,011)
Net gains on sales of assets	(28,573)	(14,918)
Proceeds from sales of loans and leases held-for-sale	268,133	80,877
Originations of loans and leases held-for-sale, net of repayments	(362,680)	(72,125)
Impairment of loan servicing rights	8,236	0
Net change in other assets	(218,094)	(95,861)
Net change in other liabilities	(405,718)	113,978
Other, net	(14,106)	(11,089)
Net cash provided by (used in) operating activities	(499,871)	139,930
Cash flows from investing activities
Proceeds from sales of investment securities available-for-sale	0	205,862
Proceeds from maturities of and principal collected on investment securities available-for-sale	311,531	50,425
Purchases of investment securities available-for-sale	(412,011)	(597,054)
Proceeds from maturities of and principal collected on investment securities held-to-maturity	4,152	2,469
Purchases of investment securities held-to-maturity	0	(821)
Redemption of Federal Home Loan Bank stock	144,000	26,000
Purchases of Federal Home Loan Bank stock	(186,000)	(38,000)
Proceeds from sales of loans and leases	287,050	194,109
Loan and lease originations and purchases, net of principal collected	(1,717,733)	(521,907)
Proceeds from sales of other assets	16,494	19,644
Purchases of premises and equipment and lease equipment	(23,846)	(41,121)
Other, net	15,177	2,937
Net cash provided by (used in) investing activities	(1,561,186)	(697,457)
Cash flows from financing activities
Net change in deposits	1,143,905	141,885
Net change in short-term borrowings	813,425	355,947
Proceeds from long-term borrowings	4,150,000	621,328
Payments on long-term borrowings	(3,912,310)	(662,097)
Payments on liabilities related to acquisition and portfolio purchase	0	(1,000)
Repurchases of common stock	(33,098)	0
Dividends paid on preferred stock	(2,493)	(2,493)
Dividends paid on common stock	(53,578)	(24,294)
Exercise of stock options	63	0
Payments related to tax-withholding upon conversion of share-based awards	(2,289)	(3,022)
Net investment by non-controlling interest	7,932	8,038
Net cash provided by (used in) financing activities	2,111,557	434,292
Net change in cash and due from banks	50,500	(123,235)
Cash and cash equivalents at beginning of period	1,228,371	587,057
Cash and cash equivalents at end of period	1,278,871	463,822
Cash paid (received) for:
Interest on deposits and borrowings	76,688	48,276
Income taxes, net	1,838	(140)
Noncash activities:
Transfer of loans and leases to other assets	15,983	27,280
Transfer of loans and leases from held-for-investment to held for sale, net	$ 251,855	$ 170,537