Loans, Net - Consolidated loan portfolio (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross	[1]	$ 773,090	$ 754,846
Less allowance for loan losses		11,894	11,786	$ 13,320
Net loans		$ 761,196	$ 743,060
Percent of Total Portfolio	[1]	100.00%	100.00%
Net of deferred loan costs		$ 3,100	$ 3,000
Construction [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		30,781	33,050
Less allowance for loan losses		$ 560	$ 550	847
Percent of Total Portfolio		4.00%	4.40%
Secured by farmland [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		$ 19,505	$ 19,708
Percent of Total Portfolio		2.50%	2.60%
Secured by 1-4 family residential [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		$ 272,198	$ 265,216
Less allowance for loan losses		$ 4,122	$ 3,966	6,734
Percent of Total Portfolio		35.20%	35.10%
Other real estate loans [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		$ 265,892	$ 255,236
Less allowance for loan losses		$ 3,963	$ 3,916	3,506
Percent of Total Portfolio		34.40%	33.80%
Commercial loans [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		$ 167,542	$ 163,269
Less allowance for loan losses		$ 1,844	$ 2,354	1,890
Percent of Total Portfolio		21.70%	21.60%
Consumer loans [Member]
Consolidated Loan Portfolio [Abstract]
Outstanding Balance, Gross		$ 17,172	$ 18,367
Less allowance for loan losses		$ 1,215	$ 821	$ 177
Percent of Total Portfolio		2.20%	2.50%

[1] Includes net deferred loan costs and premiums of $3.1 million and $3.0 million, respectively.