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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 1,798,690	$ 1,763,864
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,734,801	1,733,916
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	53,954	17,340
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,935	12,608
Purchased credit-impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	2,059	2,112
Purchased credit-impaired | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	2,059	2,112
Purchased credit-impaired | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	0	0
Purchased credit-impaired | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	0	0
Commercial loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	260,824	230,708
Total loans	260,828	230,739
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	219,346	219,625
Commercial loans | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	41,092	9,957
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	386	1,126
Commercial loans | Purchased credit-impaired | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	4	31
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	309,333	312,090
Total loans	310,486	313,277
Commercial real estate loans | Commercial real estate, owner-occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	290,074	299,998
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	10,198	4,106
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	9,061	7,986
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	895,238	872,599
Total loans	896,066	873,410
Commercial real estate loans | Commercial real estate, investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	893,574	870,443
Commercial real estate loans | Commercial real estate, investor | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	1,664	2,156
Commercial real estate loans | Commercial real estate, investor | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	50,254	76,423
Total loans	50,254	76,423
Commercial real estate loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	50,254	73,735
Commercial real estate loans | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate loans | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	0	2,688
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	1,153	1,187
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, investor
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	828	811
Commercial real estate loans | Purchased credit-impaired | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	0	0
Residential loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	121,740	124,613
Total loans	121,814	124,696
Residential loans | Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	120,400	122,844
Residential loans | Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	1,000	1,121
Residential loans | Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	340	648
Residential loans | Other residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	130,781	117,847
Residential loans | Other residential | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	130,781	117,847
Residential loans | Other residential | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Residential loans | Other residential | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Residential loans | Purchased credit-impaired | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	74	83
Residential loans | Purchased credit-impaired | Other residential
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	28,461	27,472
Consumer loans | Installment and other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	28,313	27,312
Consumer loans | Installment and other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	148	160
Consumer loans | Purchased credit-impaired | Installment and other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	$ 0	$ 0

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