Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income per consolidated statements of income	$ 105,950	$ 121,143
Adjustments to reconcile net income to net cash provided by operating activities:
PCL	10,775	(22,872)
Depreciation and amortization	30,354	34,337
Net amortization of securities	9,096	15,527
Gains on sales of loans, net	(20,674)	(58,905)
Compensation expense, long-term incentive plan	3,714	4,511
Deferred income tax provision	12,000	18,750
Proceeds from sales of loans held for sale	1,046,999	1,854,487
Purchases and originations of loans held for sale	(932,601)	(1,737,168)
Originations of mortgage servicing rights	(14,452)	(22,015)
Earnings on bank-owned life insurance	(3,639)	(3,633)
Net change in other assets	(21,585)	39,808
Net change in other liabilities	63,048	10,781
Other operating activities, net	(60,519)	(7,551)
Net cash from operating activities	228,466	247,200
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	98,211	144,356
Proceeds from maturities, prepayments and calls of securities available for sale	358,130	635,138
Purchases of securities held to maturity	(600,933)	0
Purchases of securities available for sale	(230,527)	(1,743,290)
Net proceeds from bank-owned life insurance	307	1,791
Net change in federal funds sold and securities purchased under reverse repurchase agreements	(10,098)	50
Net change in member bank stock	(5,467)	(1,217)
Net change in LHFI and PPP loans	(1,310,309)	(137,919)
Proceeds from sales of PPP loans	0	353,287
Purchases of premises and equipment	(20,656)	(19,499)
Proceeds from sales of premises and equipment	4,926	741
Proceeds from sales of other real estate	2,038	3,611
Purchases of software	(5,487)	(2,926)
Investments in tax credit and other partnerships	(20,042)	(14,690)
Net cash from investing activities	(1,739,907)	(780,567)
Financing Activities
Net change in deposits	(661,980)	874,075
Net change in federal funds purchased and securities sold under repurchase agreements	305,491	(18,102)
Net change in short-term borrowings	150,000	(19,171)
Payments on long-term FHLB advances	(14)	(14)
Payments under finance lease obligations	(1,070)	(1,072)
Common stock dividends	(42,556)	(43,800)
Repurchase and retirement of common stock	(24,604)	(34,658)
Shares withheld to pay taxes, long-term incentive plan	(1,018)	(1,337)
Net cash from financing activities	(275,751)	755,921
Net change in cash and cash equivalents	(1,787,192)	222,554
Cash and cash equivalents at beginning of period	2,266,829	1,952,504
Cash and cash equivalents at end of period	$ 479,637	$ 2,175,058