Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities
Net income per consolidated statements of income	$ 63,495	$ 99,943
Adjustments to reconcile net income to net cash provided by operating activities:
PCL	(818)	(19,331)
Depreciation and amortization	20,685	22,428
Net amortization of securities	6,672	10,780
Gains on sales of loans, net	(14,971)	(45,625)
Compensation expense, long-term incentive plan	2,485	3,395
Deferred income tax provision	9,100	12,500
Proceeds from sales of loans held for sale	726,028	1,334,752
Purchases and originations of loans held for sale	(643,267)	(1,220,055)
Originations of mortgage servicing rights	(10,159)	(15,201)
Earnings on bank-owned life insurance	(2,417)	(2,418)
Net change in other assets	982	23,623
Net change in other liabilities	23,876	(9,802)
Other operating activities, net	(31,022)	(6,871)
Net cash from operating activities	150,669	188,118
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	69,807	105,814
Proceeds from maturities, prepayments and calls of securities available for sale	253,655	442,450
Purchases of securities held to maturity	(555,191)	0
Purchases of securities available for sale	(209,100)	(1,024,649)
Net proceeds from bank-owned life insurance	307	1,791
Net change in federal funds sold and securities purchased under reverse repurchase agreements	0	50
Net change in member bank stock	(112)	(1,037)
Net change in LHFI and PPP loans	(674,854)	(237,666)
Proceeds from sales of PPP loans	0	353,287
Purchases of premises and equipment	(13,881)	(13,920)
Proceeds from sales of premises and equipment	4,926	0
Proceeds from sales of other real estate	1,413	1,167
Purchases of software	(3,664)	(2,336)
Investments in tax credit and other partnerships	(16,176)	(13,396)
Net cash from investing activities	(1,142,870)	(388,445)
Financing Activities
Net change in deposits	(316,992)	583,320
Net change in federal funds purchased and securities sold under repurchase agreements	(168,420)	(7,343)
Net change in short-term borrowings	0	(4,653)
Payments on long-term FHLB advances	(9)	(9)
Payments under finance lease obligations	(733)	(712)
Common stock dividends	(28,398)	(29,325)
Repurchase and retirement of common stock	(16,599)	(24,990)
Shares withheld to pay taxes, long-term incentive plan	(1,016)	(1,241)
Net cash from financing activities	(532,167)	515,047
Net change in cash and cash equivalents	(1,524,368)	314,720
Cash and cash equivalents at beginning of period	2,266,829	1,952,504
Cash and cash equivalents at end of period	$ 742,461	$ 2,267,224