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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 1,764,879	$ 1,763,864
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,713,077	1,733,916
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	41,551	17,340
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,251	12,608
Purchased credit-impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	2,081	2,112
Purchased credit-impaired | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	2,081	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	234,815	230,708
Total loans	234,832	230,739
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	208,201	219,625
Commercial loans | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	25,926	9,957
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	688	1,126
Commercial loans | Purchased credit-impaired | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	17	31
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	305,162	312,090
Total loans	306,327	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	285,221	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	10,861	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	9,080	7,986
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	878,147	872,599
Total loans	878,969	873,410
Commercial real estate loans | Commercial real estate, investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	875,504	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	2,643	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	63,563	76,423
Total loans	63,563	76,423
Commercial real estate loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	63,563	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	1,165	1,187
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, investor
Financing Receivable, Credit Quality Indicator [Line Items]
Purchased credit-impaired	822	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	125,891	124,613
Total loans	125,968	124,696
Residential loans | Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	123,440	122,844
Residential loans | Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	2,121	1,121
Residential loans | Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans excluding purchased credit-impaired loans	330	648
Residential loans | Other residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	124,120	117,847
Residential loans | Other residential | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	124,120	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	77	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	31,100	27,472
Consumer loans | Installment and other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,947	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	153	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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