Loans and Allowance for Credit Losses (Details 8) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for credit losses:
Beginning balance	$ 7,798	$ 10,069	$ 7,695	$ 10,725
Charge-offs	(698)	(2,177)	(1,350)	(3,925)
Recoveries	277	234	382	351
Net charge-offs	(421)	(1,943)	(968)	(3,574)
Provision	540	950	1,190	1,925
Ending balance	7,917	9,076	7,917	9,076
Construction [Member]
Allowance for credit losses:
Beginning balance	1,884	1,997	1,303	1,960
Charge-offs	(216)	(224)	(579)	(241)
Recoveries	104	1	107	11
Net charge-offs	(112)	(223)	(472)	(230)
Provision	80	474	1,021	518
Ending balance	1,852	2,248	1,852	2,248
Residential real estate [Member]
Allowance for credit losses:
Beginning balance	2,124	2,086	2,834	3,854
Charge-offs	(142)	(315)	(257)	(987)
Recoveries	121	63	145	106
Net charge-offs	(21)	(252)	(112)	(881)
Provision	215	520	(404)	(619)
Ending balance	2,318	2,354	2,318	2,354
Commercial real estate [Member]
Allowance for credit losses:
Beginning balance	2,339	4,584	2,379	3,029
Charge-offs	(280)	(1,523)	(320)	(1,613)
Recoveries	2	7	15	13
Net charge-offs	(278)	(1,516)	(305)	(1,600)
Provision	555	(416)	542	1,223
Ending balance	2,616	2,652	2,616	2,652
Commercial [Member]
Allowance for credit losses:
Beginning balance	441	677	448	1,266
Charge-offs	(25)	(95)	(149)	(937)
Recoveries	35	157	82	207
Net charge-offs	10	62	(67)	(730)
Provision	54	119	124	322
Ending balance	505	858	505	858
Consumer [Member]
Allowance for credit losses:
Beginning balance	180	308	229	243
Charge-offs	(35)	(20)	(45)	(147)
Recoveries	15	6	33	14
Net charge-offs	(20)	(14)	(12)	(133)
Provision	8	12	(49)	196
Ending balance	168	306	168	306
Unallocated Financing Receivables [Member]
Allowance for credit losses:
Beginning balance	830	417	502	373
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision	(372)	241	(44)	285
Ending balance	$ 458	$ 658	$ 458	$ 658