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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value $ 50,412 $ 66,623
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1,238 552
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 10,797 19,787
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 3,702 3,894
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 3,858 26,900
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 18 237
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 448 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 1 0
US government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 9,997 23,929
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 3 129
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
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
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses   0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value   8,051
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses   220
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 3,858 11,085
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 18 98
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 448 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 1 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 12,683 25,858
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 31 196
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 15,104 5,299
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 63 123
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   6,297
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss   122
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
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 267 11,537
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1 104
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 3,231 4,048
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 48 119
Collateralized debt obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 12,361 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1,140 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 7,566 7,688
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses $ 3,654 $ 3,555