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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value $ 17,423 $ 66,623
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1,986 552
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 24,036 19,787
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 4,074 3,894
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 4,332 26,900
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 15 237
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 1,224 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 8 0
US government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value   23,929
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses   129
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value   0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses   0
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 7,709 8,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 60 220
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 4,332 11,085
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 15 98
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 1,224 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 8 0
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 3,087 25,858
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 16 196
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value   9,518
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss   17
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value   0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss   0
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 5,299
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 123
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 5,209 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 25 0
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 0 6,297
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 0 122
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0 0
Obligations of states and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 2,093 11,537
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 8 104
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 3,829 4,048
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 42 119
Collateralized debt obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 12,243 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1,962 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 7,289 7,688
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses $ 3,947 $ 3,555