Loans and Allowance for Loan Losses - Allowance (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Activity in the allowance for loan losses:
Balance at beginning of period	$ 6,223,000	$ 4,935,000
Charge-offs	(423,000)	(9,000)
Recoveries	22,000	6,000
Provision	659,000	519,000
Balance at end of period	6,481,000	5,451,000	4,935,000
Individually evaluated for impairment	868,000	1,699,000
Collectively evaluated for impairment	5,613,000	3,752,000
Net deferred fees and costs	1,351,000	1,613,000
Loans acquired, purchase price			74,300,000
Commercial
Activity in the allowance for loan losses:
Balance at beginning of period	4,363,000	3,609,000
Charge-offs	(409,000)
Recoveries	21,000	2,000
Provision	672,000	291,000
Balance at end of period	4,647,000	3,902,000
Individually evaluated for impairment	554,000	1,358,000
Collectively evaluated for impairment	4,093,000	2,544,000
Premium on loans acquired, ratio			1.024
Premium on loans acquired, premium amount			1,800,000
Residential
Activity in the allowance for loan losses:
Balance at beginning of period	962,000	519,000
Charge-offs	(14,000)
Provision	9,000	227,000
Balance at end of period	957,000	746,000
Individually evaluated for impairment	284,000	302,000
Collectively evaluated for impairment	673,000	444,000
Home Equity
Activity in the allowance for loan losses:
Balance at beginning of period	691,000	554,000
Recoveries	1,000	1,000
Provision	(12,000)
Balance at end of period	680,000	555,000
Individually evaluated for impairment	28,000	29,000
Collectively evaluated for impairment	652,000	526,000
Consumer
Activity in the allowance for loan losses:
Balance at beginning of period	207,000	253,000
Charge-offs		(9,000)
Recoveries		3,000
Provision	(10,000)	1,000
Balance at end of period	197,000	248,000
Individually evaluated for impairment	2,000	10,000
Collectively evaluated for impairment	$ 195,000	$ 238,000