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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]  
Summary of Commitments and Contingent Liabilities A summary of commitments and contingent liabilities is as follows:

 

 

As of December 31,

 

(In thousands)

 

2018

 

 

2017

 

Commitments to extend credit

 

$

4,078,708

 

 

$

3,270,097

 

Commitments to grant loans

 

 

103,570

 

 

 

522,967

 

Standby letters of credit

 

 

141,214

 

 

 

101,718

 

Performance letters of credit

 

 

21,026

 

 

 

17,638

 

Commercial letters of credit

 

 

11,262

 

 

 

11,790