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Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 3,653	$ 10,359
Current	1,359,547	1,352,992
Total loans	1,363,200	1,363,351
Financing Receivable, Recorded Investment, Nonaccrual Status	2,638	9,350
Purchased Credit Impaired (PCI) loans no longer accreting interest	2	1,400
Purchased Credit-impaired (PCI) loans accreting interest	3,700	3,800
Deferred loan fees	861	487
Unaccreted purchase discounts on non-PCI loans	3,400	4,400
30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	3,209	1,009
60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	251
90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	193
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,951	183
Current	188,016	210,040
Total loans	189,967	210,223
Financing Receivable, Recorded Investment, Nonaccrual Status	354	0
Commercial loans | Commercial and industrial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,780	183
Commercial loans | Commercial and industrial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	150
Commercial loans | Commercial and industrial | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	21
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	139	1,403
Current	239,196	229,202
Total loans	239,335	230,605
Financing Receivable, Recorded Investment, Nonaccrual Status	0	1,403
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	139	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
Commercial real estate loans | Commercial real estate, owner-occupied | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0
Commercial real estate loans | Commercial real estate, investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	421	2,429
Current	671,256	671,070
Total loans	671,677	673,499
Financing Receivable, Recorded Investment, Nonaccrual Status	2,020	2,429
Commercial real estate loans | Commercial real estate, investor | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	421	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
Commercial real estate loans | Commercial real estate, investor | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	5,134
Current	54,921	43,279
Total loans	54,921	48,413
Financing Receivable, Recorded Investment, Nonaccrual Status	2	5,134
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
Commercial real estate loans | Construction | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	1,061	926
Current	112,670	109,862
Total loans	113,731	110,788
Financing Receivable, Recorded Investment, Nonaccrual Status	172	280
Residential loans | Home equity | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	862	646
Residential loans | Home equity | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	99
Residential loans | Home equity | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	100
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Current	71,682	73,035
Total loans	71,682	73,035
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
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
Residential loans | Other residential | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	81	284
Current	21,806	16,504
Total loans	21,887	16,788
Financing Receivable, Recorded Investment, Nonaccrual Status	90	104
Consumer loans | Installment and other consumer | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	7	$ 180
Consumer loans | Installment and other consumer | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	2
Consumer loans | Installment and other consumer | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 72

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