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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 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 September 30
2019
 
At December 31, 2018
Commitments to extend credit
$
5,894,781

 
$
5,840,585

Standby letter of credit
194,430

 
189,040

Commercial letter of credit
21,609

 
21,181

Total credit-related financial instruments with off-balance sheet risk
$
6,110,820

 
$
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 September 30,
 
Nine months ended September 30,
(In thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
684

 
$
674

 
$
674

 
$
872

Provision (benefit) charged to expense
19

 
18

 
1,839

 
(172
)
Repurchased loans and settlements charged off
(7
)
 
(10
)
 
(1,817
)
 
(18
)
Ending balance
$
696

 
$
682

 
$
696

 
$
682


The following table provides a summary of activity in the reserve for unfunded credit commitments:
 
Three months ended September 30,
 
Nine months ended September 30,
(In thousands)
2019
 
2018
 
2019
 
2018
Beginning balance
$
2,537

 
$
2,596

 
$
2,506

 
$
2,362

(Benefit) provision charged to expense
(68
)
 
28

 
(37
)
 
262

Ending balance
$
2,469

 
$
2,624

 
$
2,469

 
$
2,624