Loans and Allowance for Credit Losses (Details 8) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for credit losses:
Beginning balance	$ 8,309	$ 7,798	$ 8,316	$ 7,695
Charge-offs	(440)	(698)	(1,010)	(1,350)
Recoveries	114	277	227	382
Net charge-offs	(326)	(421)	(783)	(968)
Provision	375	540	825	1,190
Ending balance	8,358	7,917	8,358	7,917
Construction [Member]
Allowance for credit losses:
Beginning balance	1,753	1,884	1,646	1,303
Charge-offs	(13)	(216)	(254)	(579)
Recoveries	10	104	16	107
Net charge-offs	(3)	(112)	(238)	(472)
Provision	(6)	80	336	1,021
Ending balance	1,744	1,852	1,744	1,852
Residential real estate [Member]
Allowance for credit losses:
Beginning balance	2,014	2,124	2,181	2,834
Charge-offs	(102)	(142)	(118)	(257)
Recoveries	33	121	67	145
Net charge-offs	(69)	(21)	(51)	(112)
Provision	90	215	(95)	(404)
Ending balance	2,035	2,318	2,035	2,318
Commercial real estate [Member]
Allowance for credit losses:
Beginning balance	3,257	2,339	2,999	2,379
Charge-offs	(265)	(280)	(503)	(320)
Recoveries	10	2	10	15
Net charge-offs	(255)	(278)	(493)	(305)
Provision	(131)	555	365	542
Ending balance	2,871	2,616	2,871	2,616
Commercial [Member]
Allowance for credit losses:
Beginning balance	585	441	558	448
Charge-offs	(58)	(25)	(125)	(149)
Recoveries	57	35	122	82
Net charge-offs	(1)	10	(3)	(67)
Provision	93	54	122	124
Ending balance	677	505	677	505
Consumer [Member]
Allowance for credit losses:
Beginning balance	177	180	156	229
Charge-offs	(2)	(35)	(10)	(45)
Recoveries	4	15	12	33
Net charge-offs	2	(20)	2	(12)
Provision	27	8	48	(49)
Ending balance	206	168	206	168
Unallocated Financing Receivables [Member]
Allowance for credit losses:
Beginning balance	523	830	776	502
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision	302	(372)	49	(44)
Ending balance	$ 825	$ 458	$ 825	$ 458