Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income	$ 399,532	$ 297,826
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	237,619	(39,500)
Deferred income tax (benefit)	(49,239)	(692)
Stock-based compensation expense	43,231	10,076
Common stock contribution to charitable foundation	10,500	0
Depreciation and amortization of property and equipment and intangible assets	62,403	27,071
(Accretion) and amortization of interest-earning assets and borrowings	(27,025)	102,648
Amortization of low-income housing tax credit investments	31,671	2,942
Amortization of mortgage servicing assets	2,151	4,295
Reduction of right-of-use lease assets	47,874	4,074
Net (gain) on sale, net of write-downs, of foreclosed properties and repossessed assets	(1,010)	(367)
Net loss (gain) on sale, net of write-downs, of property and equipment	6,507	(98)
Net loss on sale of investment securities	2,234	0
Originations of loans held for sale	(29,628)	(192,948)
Proceeds from sale of loans held for sale	33,886	199,991
Net (gain) on mortgage banking activities	(529)	(4,523)
Net (gain) on sale of loans not originated for sale	(3,135)	(1,278)
(Increase) in cash surrender value of life insurance policies	(22,694)	(10,802)
(Gain) from life insurance policies	(2,494)	(1,350)
Net decrease in derivative contract assets and liabilities	539,257	140,991
Net (increase) in accrued interest receivable and other assets	(51,300)	(84,781)
Net (decrease) increase in accrued expenses and other liabilities	(169,146)	10,594
Net cash provided by operating activities	1,060,665	464,169
Investing Activities:
Purchases of available-for-sale securities	(1,099,810)	(857,820)
Proceeds from principal payments, maturities, and calls of available-for-sale securities	612,783	729,877
Proceeds from sale of available-for-sale securities	65,330	0
Purchases of held-to-maturity securities	(963,655)	(1,203,951)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities	627,887	1,007,842
Net (increase) decrease in Federal Home Loan Bank and Federal Reserve Bank stock	(150,706)	1,658
Alternative investments (capital calls), net of distributions	(7,811)	(8,897)
Net (increase) in loans	(5,526,220)	(66,526)
Proceeds from sale of loans not originated for sale	648,573	61,274
Proceeds from sale of foreclosed properties and repossessed assets	2,071	1,285
Proceeds from sale of property and equipment	300	2,912
Additions to property and equipment	(18,526)	(11,229)
Proceeds from life insurance policies	17,002	5,074
Net cash paid for acquisition of Bend	(54,407)	0
Net cash received in merger with Sterling	513,960	0
Net cash (used for) investing activities	(5,333,229)	(338,501)
Financing Activities:
Net increase in deposits	889,964	2,689,995
Proceeds from Federal Home Loan Bank advances	13,150,000	180,470
Repayments of Federal Home Loan Bank advances	(9,650,280)	(200,300)
Proceeds from extinguishment of borrowings	2,548	0
Net increase (decrease) in securities sold under agreements to repurchase and other borrowings	560,786	(339,484)
Dividends paid to common shareholders	(178,161)	(108,586)
Dividends paid to preferred shareholders	(9,562)	(5,906)
Exercise of stock options	635	3,469
Common stock repurchase program	(319,266)	0
Common shares acquired related to stock compensation plan activity	(22,545)	(4,271)
Net cash provided by financing activities	4,424,119	2,215,387
Net increase in cash and cash equivalents	151,555	2,341,055
Cash and cash equivalents at beginning of period	461,570	263,104
Cash and cash equivalents at end of period	613,125	2,604,159
Supplemental disclosure of cash flow information:
Interest paid	114,542	42,567
Income taxes paid	129,926	107,812
Non-cash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	163	1,048
Transfer of loans and leases to loans-held-for-sale	621,922	74,923
Unsettled purchases of investment securities	0	284,713
Sterling
Non-cash investing and financing activities:
Tangible assets acquired	27,434,111	0
Goodwill and other intangible assets	2,149,532	0
Common stock issued	5,041,182	0
Liabilities assumed	24,403,343	0
Sterling | Preferred Stock
Non-cash investing and financing activities:
Preferred stock exchanged	138,942	0
Bend Financial, Inc.
Non-cash investing and financing activities:
Tangible assets acquired	16,597	0
Goodwill and other intangible assets	38,966	0
Liabilities assumed	$ 290	$ 0