Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
Federal funds purchased, At period-end	$ 248,162	$ 213,597
Securities sold under agreements to repurchase, At period-end	241,023	342,820
Rate
Repurchase agreement	241,000	342,800
Carrying amount of the securities pledged to collateralize repurchase agreements	7,463,871	8,189,780
Asset Pledged as Collateral [Member]
Rate
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 410,400	$ 443,200
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Federal funds purchased, At period-end	Federal funds purchased, At period-end
Federal funds purchased and securities sold under repurchase agreements | Minimum
Information concerning federal funds purchased and securities sold under repurchase agreements
Maturity period from the transaction date	1 day
Federal funds purchased and securities sold under repurchase agreements | Maximum
Information concerning federal funds purchased and securities sold under repurchase agreements
Maturity period from the transaction date	3 days
Maturity period as per policies	9 months
Federal funds purchased
Amount
At period-end	$ 248,162	$ 213,597	$ 381,195
Average for the year	225,642	278,251	482,471
Maximum month-end balance	$ 268,346	$ 370,876	$ 508,248
Rate
At period-end (as a percent)	5.32%	4.31%	0.08%
Average for the year (as a percent)	5.08%	1.35%	0.09%
Securities sold under agreements to repurchase
Amount
Securities sold under agreements to repurchase, At period-end	$ 241,022	$ 342,820	$ 400,044
Average for the year	317,879	395,141	395,498
Maximum month-end balance	$ 386,627	$ 458,580	$ 435,302
Rate
At period-end (as a percent)	2.10%	0.40%	0.16%
Average for the year (as a percent)	1.30%	0.19%	0.20%