Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net income	$ 216,323	$ 221,004
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	45,500	46,749
Deferred Income Tax Expense (Benefit)	16,470	13,911
Stock-based compensation	13,760	11,646
Depreciation and amortization of property and equipment and intangible assets	19,027	20,745
Net (accretion) and amortization of interest-earning assets and borrowings	(11,893)	(4,388)
Amortization of low-income housing tax credit investments	20,413	21,478
Reduction of right-of-use lease assets	7,475	7,525
Loss on sale of investment securities, net	9,826	16,747
Originations of loans held for sale	(3,317)	(2,590)
Proceeds from sale of loans held for sale	4,713	3,832
Net (gain) on sale of mortgage servicing rights	(11,655)	0
(Increase) in cash surrender value of life insurance policies	(5,946)	(6,728)
Other operating activities, net	11,145	677
Increase (Decrease) in Derivative Assets and Liabilities	56,534	(48,570)
Increase (Decrease) in Other Operating Assets	296,416	(8,150)
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	(418,820)	(78,240)
Net cash provided by operating activities	243,681	214,294
Investing Activities:
Purchases of available-for-sale securities	(244,434)	(357,784)
Proceeds from principal payments, maturities, and calls of available-for-sale securities	205,507	119,033
Proceeds from sale of available-for-sale securities	331,690	395,358
Purchases of held-to-maturity securities	(677,961)	(599,387)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities	80,360	99,992
Net (increase) in Federal Home Loan Bank and Federal Reserve Bank stock	(54,569)	(138,824)
Alternative investments (capital calls), net of distributions	(4,192)	(3,184)
Net (increase) in loans	(692,991)	(1,478,986)
Proceeds from sale of loans not originated for sale	49,440	106,779
Proceeds from sale of mortgage servicing rights	18,310	0
Proceeds from sale of foreclosed properties and repossessed assets	790	1,745
Proceeds from sale of property and equipment	1,042	0
Additions to property and equipment	(5,057)	(10,293)
Proceeds from life insurance policies	3,977	0
Net cash (used for) investing activities	(1,347,548)	(2,023,197)
Financing Activities:
Net (decrease) increase in deposits	(26,850)	1,236,463
Net increase in Federal Home Loan Bank advances	1,299,912	3,099,909
Net (decrease) in securities sold under agreements to repurchase and other borrowings	(96,501)	(845,676)
Repayment of long-term debt	(132,550)	0
Payment of contingent consideration	(4,050)	0
Dividends paid to common stockholders	(68,599)	(70,140)
Dividends paid to preferred stockholders	(4,163)	(4,163)
Exercise of stock options	0	1,723
Common stock repurchase program	(20,403)	0
Common shares acquired related to stock compensation plan activity	(13,496)	(15,085)
Net cash provided by financing activities	933,300	3,403,031
Net (decrease) increase in cash and cash equivalents	(170,567)	1,594,128
Cash and cash equivalents, beginning of period	1,715,795	839,943
Cash and cash equivalents, end of period	1,545,228	2,434,071
Supplemental disclosure of cash flow information:
Interest paid	416,290	221,182
Income taxes paid	11,240	6,334
Non-cash investing and financing activities:
Transfer of loans and leases to foreclosed properties and repossessed assets	742	607
Transfer of returned lease equipment to assets held for sale	1,524	0
Transfer of loans and leases to loans held for sale	284,806	316,596
Forgiveness of long-term debt	(12,875)	0
Pre-existing equity interest	(2,200)	0
Sterling
Non-cash investing and financing activities:
Tangible assets acquired	0	17,607
Goodwill and other intangible assets	0	(25,561)
Liabilities assumed	0	7,954
Bend Financial, Inc.
Non-cash investing and financing activities:
Tangible assets acquired	0	294
Goodwill and other intangible assets	0	(294)
interLINK
Investing Activities:
Net cash paid for acquisition of Bend	0	(157,646)
Non-cash investing and financing activities:
Tangible assets acquired	0	6,417
Goodwill and other intangible assets	0	183,216
Liabilities assumed	0	(15,948)
Contingent consideration	0	16,039
Ametros
Investing Activities:
Net cash paid for acquisition of Bend	(359,460)	0
Non-cash investing and financing activities:
Tangible assets acquired	256,957	0
Goodwill and other intangible assets	417,085	0
Liabilities assumed	$ (299,507)	$ 0