Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net income	$ 644,283	$ 408,864	$ 220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	280,619	(54,500)	137,750
Deferred tax expense (benefit)	(69,664)	(4,998)	(31,236)
Stock-based compensation	54,099	13,662	12,179
Common stock contribution to charitable foundation	10,500	0	0
Depreciation and amortization	81,800	35,913	36,616
Amortization of earning assets and funding premium/discount, net	(26,215)	133,069	75,929
Amortization of low-income housing tax credit investments	44,208	3,918	5,286
Amortization of mortgage servicing assets	870	5,593	6,562
Increase (Decrease) in Leasing Receivables	(56,783)	(22,781)	(27,868)
Gain on sale, net of write-down, on foreclosed and repossessed assets	(1,130)	(744)	(1,938)
Loss (gain) on sale, net of write-down, on premises and equipment	8,293	(1,236)	1,105
Net loss (gain) on sale of investment securities	6,751	0	(8)
Originations of loans held for sale	(33,107)	(235,066)	(449,803)
Proceeds from sale of loans held for sale	36,335	247,634	486,341
Net (gain) on mortgage banking activities	(580)	(5,912)	(15,305)
Net (gain) on sale of loans not originated for sale	(3,322)	(3,862)	(301)
Increase in cash surrender value of life insurance policies	(29,237)	(14,429)	(14,561)
Gain from life insurance policies	(6,311)	(4,402)	(1,219)
Net decrease (increase) in derivative contract assets net of liabilities	536,820	173,506	(118,336)
Net (increase) decrease in accrued interest receivable and other assets	(106,740)	(69,263)	11,120
Net (decrease) increase in accrued expenses and other liabilities	(149,103)	38,064	(8,121)
Net cash provided by operating activities	1,335,952	688,592	380,549
Investing Activities:
Purchases of available-for-sale securities	(1,099,810)	(1,957,562)	(990,904)
Proceeds from maturities and principal payments of available-for-sale securities	754,545	935,621	627,577
Proceeds from sales of available-for-sale securities	172,947	0	8,963
Purchases of held-to-maturity securities	(1,150,023)	(1,968,133)	(1,297,535)
Proceeds from maturities and principal payments of held-to-maturity securities	750,752	1,288,140	983,864
Net proceeds from (purchase of) Federal Home Loan Bank stock	(223,562)	5,758	71,452
Purchases of intercompany debt securities	(24,887)	(11,361)	(12,244)
Net (increase) in loans	(7,501,545)	(773,443)	(1,681,947)
Proceeds from loans not originated for sale	679,693	82,187	9,197
Proceeds from the sale of foreclosed properties and repossessed assets	2,568	1,998	11,497
Proceeds from the sale of premises and equipment	300	3,221	866
Additions to premises and equipment	(28,762)	(16,589)	(21,280)
Proceeds from life insurance policies	21,893	5,074	1,885
Payments to Acquire Businesses, Net of Cash Acquired	54,407	0	0
Net (increase) decrease in interest-bearing deposits	513,960	0	0
Net cash provided by (used in) investing activities	(7,186,338)	(2,405,089)	(2,288,609)
Financing Activities:
Net increase in deposits	936,001	2,511,163	4,006,319
Proceeds from Federal Home Loan Bank advances	27,450,000	180,470	3,850,000
Repayments of Federal Home Loan Bank advances	(22,000,445)	(302,637)	(5,665,312)
Proceeds From Extinguishment Of Debt	2,548	0	0
Net increase (decrease) in securities sold under agreements to repurchase and other borrowings	447,202	(320,459)	(45,076)
Dividends paid to common shareholders	(247,767)	(144,807)	(144,965)
Dividends paid to preferred shareholders	(13,725)	(7,875)	(7,875)
Exercise of stock options	703	3,492	240
Common stock repurchased	(322,103)	0	(76,556)
Common shares acquired related to stock compensation plan activity	(23,655)	(4,384)	(3,506)
Net cash (used in) by financing activities	6,228,759	1,914,963	1,913,269
Net (decrease) increase in cash and cash equivalents	378,373	198,466	5,209
Cash and cash equivalents at beginning of year	461,570	263,104	257,895
Cash and cash equivalents at end of year	839,943	461,570	263,104
Supplemental disclosure of cash flow information:
Interest paid	240,851	42,151	118,123
Income taxes paid	193,544	112,587	94,072
Noncash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	774	1,757	5,394
Transfer of loans from portfolio to loans held for sale	652,855	78,316	8,578
Deposits assumed	313	0	4,657
Sterling
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (benefit) for credit losses	175,100
Noncash investing and financing activities:
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	26,922,010	0	0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	2,149,865	0	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	24,405,711	0	0
Stock Issued	5,041,182	0	0
Sterling | Preferred Stock
Noncash investing and financing activities:
Total consideration	138,942	0	0
Bend Financial, Inc.
Noncash investing and financing activities:
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	15,731	0	0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	38,966	0	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	$ 290	$ 0	$ 0