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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Outstanding Financial Instruments Contract Amounts Represent Credit Risk
The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk:
(In thousands)
At June 30
2019
 
At December 31, 2018
Commitments to extend credit
$
6,107,450

 
$
5,840,585

Standby letter of credit
189,890

 
189,040

Commercial letter of credit
22,837

 
21,181

Total credit-related financial instruments with off-balance sheet risk
$
6,320,177

 
$
6,050,806
Reserve For Unfunded Credit Commitments
The following table provides a summary of activity in the reserve for loan repurchases:
 
Three months ended June 30,
 
Six months ended June 30,
(In thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
676

 
$
664

 
$
674

 
$
872

Provision (benefit) charged to expense
1,813

 
13

 
1,820

 
(190
)
Repurchased loans and settlements charged off
(1,805
)
 
(3
)
 
(1,810
)
 
(8
)
Ending balance
$
684

 
$
674

 
$
684

 
$
674


The following table provides a summary of activity in the reserve for unfunded credit commitments:
 
Three months ended June 30,
 
Six months ended June 30,
(In thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
2,511

 
$
2,294

 
$
2,506

 
$
2,362

Provision charged to expense
26

 
302

 
31

 
234

Ending balance
$
2,537

 
$
2,596

 
$
2,537

 
$
2,596