Loans and Allowance for Credit Losses (Details 6) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	$ 741,030	$ 710,746
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	80,715	69,157
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	278,598	273,336
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	317,131	305,788
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	57,300	52,671
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	7,286	9,794
Pass/Performing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	670,433	640,698
Pass/Performing [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	64,209	52,241
Pass/Performing [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	257,937	252,643
Pass/Performing [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	285,881	275,573
Pass/Performing [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	55,280	50,583
Pass/Performing [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	7,126	9,658
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	37,384	34,256
Special Mention [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	4,164	5,643
Special Mention [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	9,905	6,675
Special Mention [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	21,487	20,040
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	1,790	1,885
Special Mention [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	38	13
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	32,479	35,703
Substandard [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	12,342	11,273
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	10,756	14,018
Substandard [Member] | Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	9,029	10,175
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	230	114
Substandard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	122	123
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Risk Rating	734	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	734	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