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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Summary of Outstanding Commitments to Extend Credit and Letters of Credit
The following table presents commitments to extend credit and letters of credit:
 
2014
 
2013
 
(in thousands)
Commercial and other
$
2,743,415

 
$
2,673,415

Home equity
1,294,205

 
1,245,589

Commercial mortgage and construction
351,444

 
360,574

Total commitments to extend credit
$
4,389,064

 
$
4,279,578

 
 
 
 
Standby letters of credit
$
382,465

 
$
391,445

Commercial letters of credit
32,304

 
36,344

Total letters of credit
$
414,769

 
$
427,789