Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold (Tables)

12 Months Ended

Dec. 31, 2020

Cash And Cash Equivalents [Abstract]

Summary of Average Amount of Required Reserves

The average amount of required reserves for December 31, 2019 is included in the following table:

	December 31,
	2020		2019
	(Dollars in thousands)
Vault cash and funds on deposit with the Federal    Reserve Bank	$	1,429,410	$	1,738,523
Average required reserves		—		63,842