Trust Preferred Securities And Deferral Of Interest Payments (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2006 item	Sep. 30, 2014 NPB Capital Trust 1 [Member]	Jul. 07, 2004 NPB Capital Trust 1 [Member]	Sep. 30, 2014 NPB Capital Trust 2 [Member]	Sep. 27, 2006 NPB Capital Trust 2 [Member]
Debt Instrument [Line Items]
Issuance of floating rate trust preferred securities					$ 11.3		$ 5.2
Number of branch banks acquired			2
Interest rate terms, spread over reference rate				2.60%		1.77%
Interest rate				2.83%		2.00%
Securities Maturity	30 years
Minimum redemption period	5 years
Maximum interest and penalty payment deferral period	60 months
Deferral period for dividends on trust preferred securities	60 months
Dividends in arrears	$ 2.3	$ 2.0