Loans and Allowance for Credit Losses (Details 2) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 18,154	$ 20,145
Recorded investment with no allowance	9,558	10,175
Recorded investment with an allowance	3,585	3,292
Related allowance	808	903
Quarter-to-date average recorded investment	14,267	13,741
Year-to-date average recorded investment	13,570	16,988
Impaired Nonaccrual Loans [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	11,999	9,277
Recorded investment with no allowance	4,796	6,045
Recorded investment with an allowance	2,889	0
Related allowance	643	0
Quarter-to-date average recorded investment	8,025	7,492
Year-to-date average recorded investment	8,121	7,918
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,399	4,664
Recorded investment with no allowance	3,591	1,053
Recorded investment with an allowance	487	2,982
Related allowance	156	799
Quarter-to-date average recorded investment	3,812	2,604
Year-to-date average recorded investment	2,710	4,014
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,451	4,703
Recorded investment with no allowance	884	2,842
Recorded investment with an allowance	209	280
Related allowance	9	100
Quarter-to-date average recorded investment	2,137	3,132
Year-to-date average recorded investment	2,511	4,443
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	177	1,372
Recorded investment with no allowance	165	136
Recorded investment with an allowance	0	5
Related allowance	0	1
Quarter-to-date average recorded investment	170	389
Year-to-date average recorded investment	105	558
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	128	129
Recorded investment with no allowance	122	99
Recorded investment with an allowance	0	25
Related allowance	0	3
Quarter-to-date average recorded investment	123	124
Year-to-date average recorded investment	123	55
Impaired Accruing TDRs [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	16,431	16,674
Recorded investment with no allowance	10,923	8,685
Recorded investment with an allowance	5,508	7,989
Related allowance	420	370
Quarter-to-date average recorded investment	17,333	25,107
Year-to-date average recorded investment	17,263	25,320
Impaired Accruing TDRs [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,081	4,022
Recorded investment with no allowance	3,273	3,196
Recorded investment with an allowance	808	826
Related allowance	33	41
Quarter-to-date average recorded investment	4,099	3,404
Year-to-date average recorded investment	4,076	2,301
Impaired Accruing TDRs [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	6,675	6,368
Recorded investment with no allowance	3,350	668
Recorded investment with an allowance	3,325	5,700
Related allowance	207	300
Quarter-to-date average recorded investment	7,520	16,190
Year-to-date average recorded investment	7,084	16,131
Impaired Accruing TDRs [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,675	6,237
Recorded investment with no allowance	4,300	4,774
Recorded investment with an allowance	1,375	1,463
Related allowance	180	29
Quarter-to-date average recorded investment	5,687	5,459
Year-to-date average recorded investment	6,065	6,826
Impaired Accruing TDRs [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0	47
Recorded investment with no allowance	0	47
Recorded investment with an allowance	0	0
Related allowance	0	0
Quarter-to-date average recorded investment	27	54
Year-to-date average recorded investment	38	62
Impaired Accruing TDRs [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0	0
Recorded investment with no allowance	0	0
Recorded investment with an allowance	0	0
Related allowance	0	0
Quarter-to-date average recorded investment	0	0
Year-to-date average recorded investment	0	0
Total Impired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	34,585	36,819
Recorded investment with no allowance	20,481	18,860
Recorded investment with an allowance	9,093	11,281
Related allowance	1,228	1,273
Quarter-to-date average recorded investment	31,600	38,848
Year-to-date average recorded investment	30,833	42,308
Total Impired Loans [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	16,080	13,299
Recorded investment with no allowance	8,069	9,241
Recorded investment with an allowance	3,697	826
Related allowance	676	41
Quarter-to-date average recorded investment	12,124	10,896
Year-to-date average recorded investment	12,197	10,219
Total Impired Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	11,074	11,032
Recorded investment with no allowance	6,941	1,721
Recorded investment with an allowance	3,812	8,682
Related allowance	363	1,099
Quarter-to-date average recorded investment	11,332	18,794
Year-to-date average recorded investment	9,794	20,145
Total Impired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	7,126	10,940
Recorded investment with no allowance	5,184	7,616
Recorded investment with an allowance	1,584	1,743
Related allowance	189	129
Quarter-to-date average recorded investment	7,824	8,591
Year-to-date average recorded investment	8,576	11,269
Total Impired Loans [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	177	1,419
Recorded investment with no allowance	165	183
Recorded investment with an allowance	0	5
Related allowance	0	1
Quarter-to-date average recorded investment	197	443
Year-to-date average recorded investment	143	620
Total Impired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	128	129
Recorded investment with no allowance	122	99
Recorded investment with an allowance	0	25
Related allowance	0	3
Quarter-to-date average recorded investment	123	124
Year-to-date average recorded investment	$ 123	$ 55