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Accumulated Other Comprehensive Income (Accumulated Comprehensive Income, net of income tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income, net of tax, Total $ 12,284 $ 13,997
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income, net of tax, Total 12,284 13,997
AccumulatedOtherThanTemporaryImpairmentMember    
Accumulated Other Comprehensive Income [Line Items]    
Unrealized gain on securities available-for-sale which are not other-than-temporarily impaired 15,496 22,044
Unrealized loss on securities available-for-sale which are other-than-temporarily impaired 0 (3,196)
Income tax effect of unrealized gain on securities available-for-sale 407 1,924
Net unrealized gain on securities available for sale wich are not other than temporarily impaired 15,089 16,924
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Unrealized loss on cash flow hedges (4,318) (4,307)
Income tax effect of unrealized loss on cash flow hedges 1,513 1,380
Net unrealized (loss) income on cash flow hedges $ (2,805) $ (2,927)