Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 29,461	$ 39,394
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	224	108
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	35,406	66,981
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	7,643	13,864
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	14,236	3,850
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	117	5
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	0	2,608
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	0	117
U.S. Treasury [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		27,096
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses		11
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
U.S. Government 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		18,819
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses		253
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	8,110	17,918
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	163	412
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	7,838	3,850
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	83	5
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
Commercial Mortgage-backed Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	5,733	12,298
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	26	97
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	0	973
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	0	6
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	5,560
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	47
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
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	6,398
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	34
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	18,168	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	151	0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	4,320	8,981
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	141	260
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value		0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss		0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value		2,608
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss		117
Collateralized Debt Obligations [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	22,976	20,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 7,339	$ 12,933