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Securities (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
security
Jun. 30, 2012
Jun. 30, 2013
security_type
security
transfer
Jun. 30, 2012
Investment Securities [Line Items]        
Number of securities sold 10   21  
Proceeds from sale of securities $ 29,000,000   $ 89,900,000  
Available-for-sale Securities, Gross Realized Losses 9,000      
Realized gain on available for sale securities   12,000    
Proceeds from sale of available-for-sale securities   44,500,000 76,262,000 249,323,000
Held to maturity securities, ratio of remaining par value to original purchases par value   15.00%   15.00%
Investment securities, value called by issuing agency   20,000,000   130,300,000
Net security gains realized (9,000) 12,000 21,000 996,000
Number of securities, type     2  
Transfers of securities between AFS and HTM portfolios, number     0  
Securities pledged to secure public deposits and other 692,300,000   692,300,000  
Held-to-maturity Securities [Member]
       
Investment Securities [Line Items]        
Number of securities sold 0   5  
Mortgage Backed Securities, Other [Member]
       
Investment Securities [Line Items]        
Number of securities sold   4   4
Number of securities, type     10  
Collateralized mortgage obligations [Member]
       
Investment Securities [Line Items]        
Proceeds from sale of available-for-sale securities       254,100,000
Number of securities, type     27  
Agency CMOs [Member]
       
Investment Securities [Line Items]        
Number of securities sold   6   27
Government Agency Debentures [Member]
       
Investment Securities [Line Items]        
Number of securities, type     11  
Private-Label Collateralized Mortgage Obligations [Member]
       
Investment Securities [Line Items]        
Number of securities sold   3   5
Bonds [Member]
       
Investment Securities [Line Items]        
Number of securities sold   4   5
Bonds [Member] | Held-to-maturity Securities [Member]
       
Investment Securities [Line Items]        
Number of securities sold     1  
Agency Debentures [Member]
       
Investment Securities [Line Items]        
Investment securities, value called by issuing agency $ 0   $ 50,000,000  
Number of securities, type       9
Amortizing Securities, Returned At Least 85% of Principal [Member] | Held-to-maturity Securities [Member]
       
Investment Securities [Line Items]        
Number of securities sold     4  
Investment securities, return on principal, percentage (at least)     85.00%  
Municipal Bonds [Member]
       
Investment Securities [Line Items]        
Number of securities, type     26