Trust Preferred Securities And Deferral Of Interest Payments (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 10, 2014	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2006 item	Jul. 07, 2004	Sep. 27, 2006
Debt Instrument [Line Items]
Number of branch banks acquired				2
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
Payment of trust preferred securities dividends in arrears	$ 2,500,000
Interest in arrears			0
Payment of interest on trust preferred securities		107,000
NPB Capital Trust 1 [Member]
Debt Instrument [Line Items]
Issuance of floating rate trust preferred securities					11,300,000
Interest rate terms, spread over reference rate		2.60%
Interest rate		2.85%
NPB Capital Trust 2 [Member]
Debt Instrument [Line Items]
Issuance of floating rate trust preferred securities						$ 5,200,000
Interest rate terms, spread over reference rate		1.77%
Interest rate		2.02%