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Loans and Allowance for Loan Losses - Credit Risk Profile by Internally Assigned Risk Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,763,864	$ 1,679,013
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,733,916	1,629,865
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,340	21,242
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,608	27,906
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	230,708	235,770
Total loans	230,739	235,835
Commercial | Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	219,625	214,636
Commercial | Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	9,957	9,318
Commercial | Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,126	11,816
Commercial real estate | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	312,090	299,797
Total loans	313,277	300,963
Commercial real estate | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	872,599	822,194
Total loans	873,410	822,984
Commercial real estate | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	76,423	63,828
Total loans	76,423	63,828
Commercial real estate | Pass | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	299,998	281,104
Commercial real estate | Pass | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	870,443	818,570
Commercial real estate | Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	73,735	60,859
Commercial real estate | Special Mention | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	4,106	9,284
Commercial real estate | Special Mention | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,156	1,850
Commercial real estate | Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate | Substandard | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	7,986	9,409
Commercial real estate | Substandard | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	1,774
Commercial real estate | Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,688	2,969
Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	124,613	132,373
Total loans	124,696	132,467
Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	117,847	95,526
Residential loans | Pass | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	122,844	130,558
Residential loans | Pass | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	117,847	95,526
Residential loans | Special Mention | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,121	0
Residential loans | Special Mention | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential loans | Substandard | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	648	1,815
Residential loans | Substandard | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,472	27,410
Consumer loans | Pass | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,312	27,287
Consumer loans | Special Mention | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Substandard | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	160	123
Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,112	2,115
Purchased credit-impaired | Pass
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,112	1,325
Purchased credit-impaired | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	790
Purchased credit-impaired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Purchased credit-impaired | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	31	65
Purchased credit-impaired | Commercial real estate | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,187	1,166
Purchased credit-impaired | Commercial real estate | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	811	790
Purchased credit-impaired | Commercial real estate | Construction
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Purchased credit-impaired | Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	83	94
Purchased credit-impaired | Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Purchased credit-impaired | Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	$ 0	$ 0

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Loans and Leases Receivable, Net of Deferred Income, Excluding Purchased Credit-impaired Loans

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