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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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 June 30, 2017
 
At December 31, 2016
Commitments to extend credit
$
5,211,813

 
$
5,224,280

Standby letter of credit
138,536

 
128,985

Commercial letter of credit
40,678

 
46,497

Total credit-related financial instruments with off-balance sheet risk
$
5,391,027

 
$
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 June 30,
 
Six months ended June 30,
(In thousands)
2017
 
2016
 
2017
 
2016
Beginning balance
$
824

 
$
1,119

 
$
790

 
$
1,192

Provision (benefit) charged to expense
19

 
(127
)
 
53

 
(102
)
Repurchased loans and settlements charged off
—

 
—

 
—

 
(98
)
Ending balance
$
843

 
$
992

 
$
843

 
$
992

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)
2017
 
2016
 
2017
 
2016
Beginning balance
$
2,655

 
$
2,126

 
$
2,287

 
$
2,119

(Benefit) provision charged to expense
(111
)
 
193

 
257

 
200

Ending balance
$
2,544

 
$
2,319

 
$
2,544

 
$
2,319