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Fair Value of Financial Instruments (Unobservable Input Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investment In Unconsolidated Entity [Member]    
Changes in Company's Level 3 assets [Roll Forward]    
Beginning balance $ 193,595  
Total gains or losses (realized/unrealized) Included in earnings 2,430  
Purchases, issuances, and settlements [Abstract]    
Purchases   $ 193,595
Settlements (12,645)  
Ending balance 178,520 193,595
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date (2,430)  
Available-for-sale Securities [Member]    
Changes in Company's Level 3 assets [Roll Forward]    
Beginning balance 1,366 551
Transfers into level 3   1,279
Transfers out of level 3   (551)
Total gains or losses (realized/unrealized) Included in earnings (23)  
Included in other comprehensive income   87
Purchases, issuances, and settlements [Abstract]    
Sales (1,343)  
Ending balance   1,366
Held-to-maturity Securities [Member]    
Changes in Company's Level 3 assets [Roll Forward]    
Beginning balance 217,080 69,904
Total gains or losses (realized/unrealized) Included in earnings 1,677 1,846
Purchases, issuances, and settlements [Abstract]    
Issuances 681,526 630,165
Sales (410,345) (484,835)
Ending balance 489,938 217,080
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ 4,321 $ 3,587