Loans and Allowance for Credit Losses (Details 6) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	$ 777,062	$ 710,746
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	86,548	69,157
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	303,137	273,336
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	323,160	305,788
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	57,129	52,671
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	7,088	9,794
Pass/Performing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	709,255	640,698
Pass/Performing [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	69,344	52,241
Pass/Performing [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	283,551	252,643
Pass/Performing [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	294,148	275,573
Pass/Performing [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	55,282	50,583
Pass/Performing [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	6,930	9,658
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	35,276	34,256
Special Mention [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	5,525	5,643
Special Mention [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	7,823	6,675
Special Mention [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	20,261	20,040
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	1,632	1,885
Special Mention [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	35	13
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	32,322	35,703
Substandard [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	11,679	11,273
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	11,763	14,018
Substandard [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	8,542	10,175
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	215	114
Substandard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	123	123
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	209	89
Doubtful [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	0	0
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	0	0
Doubtful [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	209	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	0	89
Doubtful [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	$ 0	$ 0