Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 253,788	$ 331,946
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	5,089	10,934
Gain on sale of investment securities, net	(2)	(4)
Provision (recapture) for credit losses	51,068	(41,915)
Change in cash surrender value of bank owned life insurance	(6,293)	(6,302)
Depreciation, amortization and accretion	21,560	23,492
(Gain) loss on sale of premises and equipment	(2,203)	436
Additions to residential mortgage servicing rights carried at fair value	(20,397)	(30,845)
Change in fair value of residential mortgage servicing rights carried at fair value	(52,165)	17,918
Stock-based compensation	7,254	8,106
Net decrease in equity and other investments	1,554	457
Loss on equity securities, net	7,383	1,045
Loss (gain) on sale of loans and leases, net	207	(124,764)
Change in fair value of loans held for sale	14,616	21,727
Origination of loans held for sale	(1,622,633)	(3,875,836)
Proceeds from sales of loans held for sale	1,793,676	4,065,846
Change in other assets and liabilities:
Net decrease in other assets	203,802	161,119
Net increase (decrease) in other liabilities	248,362	(21,816)
Net cash provided by operating activities	904,666	541,544
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(175,656)	(1,473,840)
Proceeds from investment securities available for sale	328,685	578,240
Purchases of restricted equity securities	164,344	34
Redemption of restricted equity securities	134,267	30,754
Net change in loans and leases	(3,064,741)	(85,539)
Proceeds from sales of loans and leases	111,584	182,605
Change in premises and equipment	(11,259)	(13,121)
Proceeds from bank owned life insurance death benefits	4,069	3,401
Net cash received from sale of Umpqua Investments, Inc.	0	10,781
Other	1,997	1,879
Net cash used in investing activities	(2,835,398)	(764,874)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit liabilities	222,437	2,286,225
Net (decrease) increase in securities sold under agreements to repurchase	(108,678)	92,376
Proceeds from borrowings	750,000	0
Repayment of borrowings	0	(765,000)
Net proceeds from issuance of common stock	54	34
Dividends paid on common stock	(136,693)	(138,243)
Repurchase and retirement of common stock	(4,150)	(80,654)
Net cash provided by financing activities	722,970	1,394,738
Net (decrease) increase in cash and cash equivalents	(1,207,762)	1,171,408
Cash and cash equivalents, beginning of period	2,761,621	2,573,181
Cash and cash equivalents, end of period	1,553,859	3,744,589
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	33,154	35,085
Income taxes	44,174	81,482
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Changes in unrealized gains and losses on investment securities available for sale, net of taxes	(427,691)	(69,478)
Changes in unrealized gains and losses on junior subordinated debentures carried at fair value, net of taxes	(23,628)	(33,058)
Transfer of loans held for sale to loans held for investment	$ 13,799	$ 315,887