Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 418,744	$ 172,663
Money market and other interest-earning investments	1,557,808	649,356
Total cash and cash equivalents	1,976,552	822,019
Equity securities, at fair value	67,555	13,211
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	8,750,604	7,382,066
Investment securities - held-to-maturity, at amortized cost (fair value $1,955,596 and $0, respectively)	2,082,242	0
Federal Home Loan Bank/Federal Reserve Bank stock, at cost	290,393	169,375
Loans held for sale, at fair value	39,376	35,458
Loans:
Total loans	28,336,244	13,601,846
Allowance for credit losses	(280,507)	(107,341)
Net loans	28,055,737	13,494,505
Premises and equipment, net	584,113	476,186
Operating lease right-of-use assets	201,802	69,560
Accrued interest receivable	136,975	84,109
Goodwill	1,997,157	1,036,994
Other intangible assets	147,452	34,678
Company-owned life insurance	766,291	463,324
Other assets	738,399	372,079
Total assets	45,834,648	24,453,564
Deposits:
Noninterest-bearing demand	12,463,136	6,303,106
Interest-bearing:
Checking and NOW	8,296,337	5,338,022
Savings	6,871,767	3,798,494
Money market	5,432,139	2,169,160
Time deposits	2,544,011	960,413
Total deposits	35,607,390	18,569,195
Federal funds purchased and interbank borrowings	1,721	276
Securities sold under agreements to repurchase	509,275	392,275
Federal Home Loan Bank advances	3,239,357	1,886,019
Other borrowings	597,207	296,670
Operating lease liabilities	234,049	76,236
Accrued expenses and other liabilities	413,535	220,875
Total liabilities	40,602,534	21,441,546
Shareholders' Equity
Preferred stock, 2,000 shares authorized, 231 and 0 shares issued and outstanding, respectively	230,500	0
Common stock, $1.00 per share stated value, 600,000 shares authorized,    292,959 and 165,838 shares issued and outstanding, respectively	292,959	165,838
Capital surplus	4,149,594	1,880,545
Retained earnings	897,260	968,010
Accumulated other comprehensive income (loss), net of tax	(338,199)	(2,375)
Total shareholders' equity	5,232,114	3,012,018
Total liabilities and shareholders' equity	45,834,648	24,453,564
Commercial
Loans:
Total loans	8,624,253	3,391,769
Allowance for credit losses	(99,471)	(27,232)
Commercial real estate
Loans:
Total loans	11,337,735	6,380,674
Allowance for credit losses	(140,490)	(64,004)
Residential real estate
Loans:
Total loans	5,706,155	2,255,289
Allowance for credit losses	(17,252)	(9,347)
Consumer credit, net of unearned income
Loans:
Total loans	2,668,101	1,574,114
U.S. Treasury
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	419,024	235,584
U.S. government-sponsored entities and agencies
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	1,580,020	1,542,773
Investment securities - held-to-maturity, at amortized cost (fair value $1,955,596 and $0, respectively)	528,524
Mortgage-backed securities
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	5,623,742	3,698,831
Investment securities - held-to-maturity, at amortized cost (fair value $1,955,596 and $0, respectively)	463,111
States and political subdivisions
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	750,056	1,654,986
Investment securities - held-to-maturity, at amortized cost (fair value $1,955,596 and $0, respectively)	1,090,667
Other securities
Investment securities - available-for-sale, at fair value:
Total investment securities - available-for-sale	$ 377,762	$ 249,892