Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities
Net income per consolidated statements of income	$ 95,337	$ 63,495
Adjustments to reconcile net income to net cash provided by operating activities:
PCL	9,458	(818)
Depreciation and amortization	16,448	20,685
Net amortization of securities	3,331	6,672
Gains on sales of loans, net	(6,749)	(14,971)
Compensation expense, long-term incentive plan	3,278	2,485
Deferred income tax provision	(380)	9,100
Proceeds from sales of loans held for sale	556,031	726,028
Purchases and originations of loans held for sale	(613,829)	(643,267)
Originations of mortgage servicing rights	(6,602)	(10,159)
Earnings on bank-owned life insurance	(2,531)	(2,417)
Net change in other assets	(7,525)	(982)
Net change in other liabilities	8,848	23,876
Other operating activities, net	(28,779)	(31,022)
Net cash from operating activities	26,336	150,669
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	52,451	69,807
Proceeds from maturities, prepayments and calls of securities available for sale	160,240	253,655
Purchases of securities held to maturity	(8,967)	(555,191)
Purchases of securities available for sale	0	(209,100)
Net proceeds from bank-owned life insurance	(27)	307
Net change in federal funds sold and securities purchased under reverse repurchase agreements	4,000	0
Net change in member bank stock	(20,248)	(112)
Net change in LHFI and PPP loans	(412,869)	(674,854)
Purchases of premises and equipment	(25,594)	(13,881)
Proceeds from sales of premises and equipment	1,815	4,926
Proceeds from sales of other real estate	1,154	1,413
Purchases of software	(4,955)	(3,664)
Investments in tax credit and other partnerships	(9,237)	(16,176)
Net cash from investing activities	(262,237)	(1,142,870)
Financing Activities
Net change in deposits	476,252	(316,992)
Net change in federal funds purchased and securities sold under repurchase agreements	(138,152)	(168,420)
Net change in short-term borrowings	25,000	0
Payments on long-term FHLB advances	(10)	(9)
Payments under finance lease obligations	(535)	(733)
Common stock dividends	(28,319)	(28,398)
Repurchase and retirement of common stock	0	(16,599)
Shares withheld to pay taxes, long-term incentive plan	(1,070)	(1,016)
Net cash from financing activities	333,166	(532,167)
Net change in cash and cash equivalents	97,265	(1,524,368)
Cash and cash equivalents at beginning of period	734,787	2,266,829
Cash and cash equivalents at end of period	$ 832,052	$ 742,461