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Fair Value (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance $ 16,033 $ 16,007
Total realized/unrealized gains or losses - Included in earnings   (542)
Total realized/unrealized gains or losses - Included in other comprehensive income 395 1,556
Transfers & Purchases   1,186
Settlements (3,954) (2,174)
Ending balance 12,474 16,033
Equity Securities
   
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance   1,711
Total realized/unrealized gains or losses - Included in earnings   (446)
Settlements   (1,265)
State and Municipal Obligations
   
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance 9,911 9,525
Transfers & Purchases   1,186
Settlements (3,409) (800)
Ending balance 6,502 9,911
Collateralized Debt Obligations
   
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance 6,122 4,771
Total realized/unrealized gains or losses - Included in earnings   (96)
Total realized/unrealized gains or losses - Included in other comprehensive income 395 1,556
Settlements (545) (109)
Ending balance $ 5,972 $ 6,122