Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 490,018	$ 351,959
INVESTING ACTIVITIES
Proceeds from maturities and calls of held to maturity securities	0	215
Proceeds from sales of securities available for sale	219	39,294
Proceeds from maturities and calls of securities available for sale	302,323	361,699
Purchases of securities available for sale	(1,434,105)	(759,335)
Proceeds from sales of equity securities	349	1,250
Purchases of equity securities	(1,891)	(1,305)
Proceeds from sales and redemptions of other investment securities	3,182	7,558
Purchases of other investment securities	(15,614)	(14,199)
Purchases of bank-owned life insurance policies	0	(50,000)
Redemption of bank-owned life insurance policies	9,395	0
Purchases of bank premises and equipment	(6,125)	(6,537)
Proceeds from sales of bank premises and equipment	844	1,560
Proceeds from sales of OREO properties	2,507	2,703
Net change in loans	(939,329)	710,855
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(2,078,245)	293,758
FINANCING ACTIVITIES
Cash dividends paid	(95,942)	(90,715)
Acquisition of treasury stock	(79,452)	(11,210)
Proceeds from exercise of stock options	6,377	4,361
Repayment of long-term Federal Home Loan Bank borrowings	(20,000)	(550,000)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	0	500,000
Changes in:
Deposits	(321,838)	984,730
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	(602)	(14,555)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(511,457)	822,611
(Decrease) Increase in cash and cash equivalents	(2,099,684)	1,468,328
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	3,758,170	2,209,068
CASH AND CASH EQUIVALENTS AT END OF YEAR	1,658,486	3,677,396
Noncash investing activities:
Transfers of loans to OREO	1,131	2,261
Transfers of loans to bank premises and equipment	4,541	0
Subsidiaries [Member]
Acquisition of subsidiaries:
Assets acquired, net of cash	(345)	(7,190)
Liabilities assumed	2,050	6,002
Goodwill	$ 2,395	$ 13,192

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+ References

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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-SubTopic 10
-Section 45
-Paragraph 14
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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- Definition

Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Topic 230
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586

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