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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding

The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding:

 

     December 31,  

(in thousands)

    2017      2016  

Lines of credit

    $ 1,452,697      $ 1,418,329  

Loans approved but not closed

      245,644        185,254  

Overdraft limits

      126,671        126,517  

Letters of credit

      31,951        32,907  

Contingent obligations to purchase loans funded by other entities

      6,700        13,036