Loans and Allowance for Credit Losses (Details 8) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for credit losses:
Beginning balance	$ 7,917	$ 9,076	$ 7,695	$ 10,725
Charge-offs	(641)	(1,515)	(1,991)	(5,440)
Recoveries	412	270	794	621
Net charge-offs	(229)	(1,245)	(1,197)	(4,819)
Provision	410	775	1,600	2,700
Ending balance	8,098	8,606	8,098	8,606
Construction [Member]
Allowance for credit losses:
Beginning balance	1,852	2,248	1,303	1,960
Charge-offs	(479)	(213)	(1,058)	(454)
Recoveries	9	1	116	12
Net charge-offs	(470)	(212)	(942)	(442)
Provision	460	(206)	1,481	312
Ending balance	1,842	1,830	1,842	1,830
Residential real estate [Member]
Allowance for credit losses:
Beginning balance	2,318	2,354	2,834	3,854
Charge-offs	(26)	(242)	(283)	(1,229)
Recoveries	102	229	247	335
Net charge-offs	76	(13)	(36)	(894)
Provision	(103)	47	(507)	(572)
Ending balance	2,291	2,388	2,291	2,388
Commercial real estate [Member]
Allowance for credit losses:
Beginning balance	2,616	2,652	2,379	3,029
Charge-offs	0	(35)	(320)	(1,648)
Recoveries	233	9	248	22
Net charge-offs	233	(26)	(72)	(1,626)
Provision	(38)	115	504	1,338
Ending balance	2,811	2,741	2,811	2,741
Commercial [Member]
Allowance for credit losses:
Beginning balance	505	858	448	1,266
Charge-offs	(136)	(1,019)	(285)	(1,956)
Recoveries	60	24	142	231
Net charge-offs	(76)	(995)	(143)	(1,725)
Provision	70	935	194	1,257
Ending balance	499	798	499	798
Consumer [Member]
Allowance for credit losses:
Beginning balance	168	306	229	243
Charge-offs	0	(6)	(45)	(153)
Recoveries	8	7	41	21
Net charge-offs	8	1	(4)	(132)
Provision	(20)	(39)	(69)	157
Ending balance	156	268	156	268
Unallocated Financing Receivables [Member]
Allowance for credit losses:
Beginning balance	458	658	502	373
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision	41	(77)	(3)	208
Ending balance	$ 499	$ 581	$ 499	$ 581