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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
At December 31, 2016
Commitments to extend credit
$
5,043,151

 
$
5,224,280

Standby letter of credit
159,485

 
128,985

Commercial letter of credit
42,007

 
46,497

Total credit-related financial instruments with off-balance sheet risk
$
5,244,643

 
$
5,399,762
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)
2017
 
2016
 
2017
 
2016
Beginning balance
$
843

 
$
992

 
$
790

 
$
1,192

Provision (benefit) charged to expense
25

 
37

 
78

 
(64
)
Repurchased loans and settlements charged off
(18
)
 
—

 
(18
)
 
(99
)
Ending balance
$
850

 
$
1,029

 
$
850

 
$
1,029

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)
2017
 
2016
 
2017
 
2016
Beginning balance
$
2,544

 
$
2,319

 
$
2,287

 
$
2,119

Provision charged to expense
—

 
172

 
257

 
372

Ending balance
$
2,544

 
$
2,491

 
$
2,544

 
$
2,491