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Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) $ in Thousands	Jun. 30, 2015 USD ($) loans	Dec. 31, 2014 USD ($) loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 8,219	$ 10,359
Current	1,330,986	1,352,992
Total loans	$ 1,339,205	$ 1,363,351
Non-accrual loans to total loans	0.50%	0.70%
Purchased Credit Impaired (PCI) loans no longer accreting interest	$ 1,400	$ 1,400
Purchased Credit-impaired (PCI) loans accreting interest	$ 3,700	$ 3,800
Number of accruing loans past due more than ninety days | loans	0	0
Deferred loan fees	$ 781	$ 487
Unaccreted purchase discounts on non-PCI loans	3,700	4,400
30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,147	1,009
60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	4	0
Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	7,068	9,350
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	347	183
Current	184,673	210,040
Total loans	$ 185,020	$ 210,223
Non-accrual loans to total loans	0.20%	0.00%
Commercial loans | Commercial and industrial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 183
Commercial loans | Commercial and industrial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Commercial loans | Commercial and industrial | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	347	0
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,403	1,403
Current	233,718	229,202
Total loans	$ 235,121	$ 230,605
Non-accrual loans to total loans	0.60%	0.60%
Commercial real estate loans | Commercial real estate, owner-occupied | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 0
Commercial real estate loans | Commercial real estate, owner-occupied | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Commercial real estate loans | Commercial real estate, owner-occupied | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,403	1,403
Commercial real estate loans | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	2,278	2,429
Current	661,079	671,070
Total loans	$ 663,357	$ 673,499
Non-accrual loans to total loans	0.30%	0.40%
Commercial real estate loans | Commercial real estate, investor | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 0
Commercial real estate loans | Commercial real estate, investor | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Commercial real estate loans | Commercial real estate, investor | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	2,278	2,429
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	2,733	5,134
Current	46,021	43,279
Total loans	$ 48,754	$ 48,413
Non-accrual loans to total loans	5.60%	10.60%
Commercial real estate loans | Construction | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 0
Commercial real estate loans | Construction | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Commercial real estate loans | Construction | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	2,733	5,134
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,264	926
Current	114,229	109,862
Total loans	$ 115,493	$ 110,788
Non-accrual loans to total loans	0.20%	0.30%
Residential loans | Home equity | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 999	$ 646
Residential loans | Home equity | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Residential loans | Home equity | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	265	280
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Current	73,721	73,035
Total loans	$ 73,721	$ 73,035
Non-accrual loans to total loans	0.00%	0.00%
Residential loans | Other residential | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 0
Residential loans | Other residential | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Residential loans | Other residential | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	194	284
Current	17,545	16,504
Total loans	$ 17,739	$ 16,788
Non-accrual loans to total loans	0.20%	0.60%
Consumer loans | Installment and other consumer | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 148	$ 180
Consumer loans | Installment and other consumer | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	4	0
Consumer loans | Installment and other consumer | Greater than 90 days past due (non-accrual) 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 42	$ 104

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