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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements [Abstract]  
Fair value of financial assets and liabilities measured on recurring basis

The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2013 and 2012, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:

 

                                 
    Level 1
Inputs
    Level 2
Inputs
    Level 3
Inputs
    Total Fair
Value
 
    (Dollars in thousands)  

March 31, 2013

                               

Securities available for sale

  $ 20,304     $ 518,963     $ 10,124     $ 549,391  

Derivative assets

    —         3,424       —         3,424  

Derivative liabilities

    —         1,658       —         1,658  

Loans held for sale

    —         10,287       —         10,287  

Mortgage servicing intangibles

    —         —         709       709  

March 31, 2012

                               

Securities available for sale

  $ —       $ 543,069     $ 9,373     $ 552,442  

Derivative assets

    —         10,578       —         10,578  

Derivative liabilities

    —         8,576       —         8,576  

Loans held for sale

    —         15,585       —         15,585  

Mortgage servicing intangibles

    —         —         1,004       1,004  
Changes in level 3 assets measured at estimated fair value on a recurring basis

The changes in Level 3 assets measured at estimated fair value on a recurring basis during the three months ended March 31, 2013 and 2012 were as follows:

 

                 
    Three Months Ended
March 31,
 
    2013     2012  
    (Dollars in thousands)  

Balance at the beginning of the year

  $ 10,779     $ 13,225  

Purchases, issuances and settlements

    116       173  

Sales

    (15     (4,928

(Losses) gains included in earnings

    (30     3,973  

Total unrealized losses

    (17     (2,066
   

 

 

   

 

 

 

Balance at the end of the period

  $ 10,833     $ 10,377  
   

 

 

   

 

 

 
Assets measured at fair value on a nonrecurring basis

The following table summarizes assets measured at fair value on a nonrecurring basis and the related gains or losses recognized during the period:

 

                                         
    Level 1     Level 2     Level 3     Total Fair
Value
    Gains
(Losses)
 
    (Dollars in thousands)  

Three Months Ended March 31, 2013

       

Impaired loans (less specific allowance)

    —         —       $ 40,852     $ 40,852     $ —    

Foreclosed assets

    —         —       $ 326     $ 326     $ 13  

Other real estate owned

    —         —       $ 9,098     $ 9,098     $ (87

Three Months Ended March 31, 2012

                                       

Impaired loans (less specific allowance)

    —         —       $ 46,243     $ 46,243     $ —    

Foreclosed assets

    —         —       $ 403     $ 403     $ (1

Other real estate owned

    —         —       $ 12,005     $ 12,005     $ (154
Estimated fair values of company's financial instruments

The estimated fair values of the Company’s financial instruments are as follows:

 

                                 
    March 31,  
    2013     2012  
    Carrying
Amount
    Fair Value     Carrying
Amount
    Fair Value  
    (Dollars in thousands)  

FINANCIAL ASSETS

                               

Cash and cash equivalents

  $ 1,716,052     $ 1,716,052     $ 1,836,954     $ 1,836,954  

Securities held for investment

    16,099       16,317       21,359       21,788  

Loans:

                               

Loans (net of unearned interest)

    3,219,967               3,049,376          

Allowance for loan losses

    (38,664             (37,633        
   

 

 

           

 

 

         

Loans, net

    3,181,303       3,240,479       3,011,743       3,047,715  

FINANCIAL LIABILITIES

                               

Deposits

    5,174,512       5,200,273       5,152,856       5,186,324  

Short-term borrowings

    4,891       4,891       7,323       7,323  

Long-term borrowings

    11,040       11,010       13,403       13,440  

Junior subordinated debentures

    26,804       31,093       36,083       39,289  

OFF-BALANCE SHEET FINANCIAL INSTRUMENTS

                               

Loan commitments

            1,556               1,197  

Letters of credit

            469               463