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Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold (Tables)
 12 Months Ended
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]  
Summary of Average Amount of Required Reserves The average amount of required reserves for each of the years ended December 31, 2018 and 2017 is included in the following table:

 

 

 

December 31,

 

 

 

2018

 

 

2017

 

 

 

(Dollars in thousands)

 

Vault cash and funds on deposit with the Federal Reserve Bank

 

$

1,299,872

 

 

$

1,639,058

 

Average required Reserves

 

 

45,195

 

 

 

44,485