Loans and Allowance for Credit Losses (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 17,921	$ 17,704
Recorded investment with no allowance	8,852	8,492
Recorded investment with an allowance	3,073	3,601
Related allowance	832	812
Quarter-to-date average recorded investment	12,346	12,675
Interest income recognized	0	0
Impaired Nonaccrual Loans [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	11,167	11,850
Recorded investment with no allowance	3,724	4,647
Recorded investment with an allowance	2,874	2,882
Related allowance	755	588
Quarter-to-date average recorded investment	7,216	7,630
Interest income recognized	0	0
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2,600	2,563
Recorded investment with no allowance	2,079	1,773
Recorded investment with an allowance	199	487
Related allowance	77	208
Quarter-to-date average recorded investment	2,292	3,360
Interest income recognized	0	0
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,854	2,988
Recorded investment with no allowance	2,774	1,813
Recorded investment with an allowance	0	209
Related allowance	0	9
Quarter-to-date average recorded investment	2,559	1,401
Interest income recognized	0	0
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	172	175
Recorded investment with no allowance	154	161
Recorded investment with an allowance	0	0
Related allowance	0	0
Quarter-to-date average recorded investment	158	163
Interest income recognized	0	0
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	128	128
Recorded investment with no allowance	121	98
Recorded investment with an allowance	0	23
Related allowance	0	7
Quarter-to-date average recorded investment	121	121
Interest income recognized	0	0
Impaired Accruing TDRs [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	14,753	15,495
Recorded investment with no allowance	6,960	7,348
Recorded investment with an allowance	7,793	8,147
Related allowance	692	589
Quarter-to-date average recorded investment	15,073	16,100
Interest income recognized	126	651
Impaired Accruing TDRs [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,992	4,069
Recorded investment with no allowance	3,194	3,266
Recorded investment with an allowance	798	803
Related allowance	28	31
Quarter-to-date average recorded investment	4,041	4,073
Interest income recognized	25	84
Impaired Accruing TDRs [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,655	5,686
Recorded investment with no allowance	2,667	2,380
Recorded investment with an allowance	2,988	3,306
Related allowance	112	227
Quarter-to-date average recorded investment	5,669	6,338
Interest income recognized	55	312
Impaired Accruing TDRs [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,106	5,740
Recorded investment with no allowance	1,099	1,702
Recorded investment with an allowance	4,007	4,038
Related allowance	552	331
Quarter-to-date average recorded investment	5,363	5,689
Interest income recognized	46	254
Impaired Accruing TDRs [Member] | Commercial 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
Interest income recognized	0	1
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
Interest income recognized	0	0
Total Impired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	32,674	33,199
Recorded investment with no allowance	15,812	15,840
Recorded investment with an allowance	10,866	11,748
Related allowance	1,524	1,401
Quarter-to-date average recorded investment	27,419	28,775
Interest income recognized	126	651
Total Impired Loans [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	15,159	15,919
Recorded investment with no allowance	6,918	7,913
Recorded investment with an allowance	3,672	3,685
Related allowance	783	619
Quarter-to-date average recorded investment	11,257	11,703
Interest income recognized	25	84
Total Impired Loans [Member] | Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,255	8,249
Recorded investment with no allowance	4,746	4,153
Recorded investment with an allowance	3,187	3,793
Related allowance	189	435
Quarter-to-date average recorded investment	7,961	9,698
Interest income recognized	55	312
Total Impired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,960	8,728
Recorded investment with no allowance	3,873	3,515
Recorded investment with an allowance	4,007	4,247
Related allowance	552	340
Quarter-to-date average recorded investment	7,922	7,090
Interest income recognized	46	254
Total Impired Loans [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	172	175
Recorded investment with no allowance	154	161
Recorded investment with an allowance	0	0
Related allowance	0	0
Quarter-to-date average recorded investment	158	163
Interest income recognized	0	1
Total Impired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	128	128
Recorded investment with no allowance	121	98
Recorded investment with an allowance	0	23
Related allowance	0	7
Quarter-to-date average recorded investment	121	121
Interest income recognized	$ 0	$ 0