Loans and Allowance for Credit Losses (Details 7) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	$ 759,723	$ 688,156
Total past due	4,196	9,124
Non-accrual	13,143	13,466
Total loans	$ 777,062	$ 710,746
Percent of total loans, Current	97.70%	96.80%
Percent of total loans, Total past due	0.60%	1.30%
Percent of total loans, Non accrual	1.70%	1.90%
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	$ 3,507	$ 5,654
Percent of total loans, Total past due	0.50%	0.80%
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	$ 685	$ 3,383
Percent of total loans, Total past due	0.10%	0.50%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	$ 4	$ 87
Percent of total loans, Total past due	0.00%	0.00%
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	$ 78,863	$ 61,325
Total past due	0	1,786
Non-accrual	7,685	6,046
Total loans	86,548	69,157
Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	1,786
Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	0
Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	0
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	296,151	263,165
Total past due	2,908	6,136
Non-accrual	4,078	4,035
Total loans	303,137	273,336
Residential real estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	2,274	3,351
Residential real estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	634	2,702
Residential real estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	83
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	320,934	301,695
Total past due	1,133	972
Non-accrual	1,093	3,121
Total loans	323,160	305,788
Commercial real estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	1,133	459
Commercial real estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	513
Commercial real estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	0
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	56,901	52,352
Total past due	63	178
Non-accrual	165	141
Total loans	57,129	52,671
Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	21	47
Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	42	131
Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	0	0
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current	6,874	9,619
Total past due	92	52
Non-accrual	122	123
Total loans	7,088	9,794
Consumer [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	79	11
Consumer [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	9	37
Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total past due	$ 4	$ 4