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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,671,740	$ 1,679,013
Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	2,135	2,115
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,625,503	1,629,865
Pass | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,338	1,325
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,430	21,242
Special Mention | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	797	790
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,807	27,906
Substandard | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Commercial loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	231,628	235,770
Total loans	231,680	235,835
Commercial loans | Commercial and industrial | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	52	65
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	213,676	214,636
Commercial loans | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	4,761	9,318
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	13,191	11,816
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	299,183	299,797
Total loans	300,377	300,963
Commercial real estate loans | Commercial real estate, owner-occupied | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	1,194	1,166
Commercial real estate loans | Commercial real estate, owner-occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	279,899	281,104
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	9,918	9,284
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	9,366	9,409
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	828,148	822,194
Total loans	828,945	822,984
Commercial real estate loans | Commercial real estate, investor | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	797	790
Commercial real estate loans | Commercial real estate, investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	824,867	818,570
Commercial real estate loans | Commercial real estate, investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,954	1,850
Commercial real estate loans | Commercial real estate, investor | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	327	1,774
Commercial real estate loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	64,978	63,828
Total loans	64,978	63,828
Commercial real estate loans | Construction | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Commercial real estate loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	62,003	60,859
Commercial real estate loans | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Commercial real estate loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	2,975	2,969
Residential loans | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	124,607	132,373
Total loans	124,699	132,467
Residential loans | Home equity | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	92	94
Residential loans | Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	122,760	130,558
Residential loans | Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	0	0
Residential loans | Home equity | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans excluding purchased credit-impaired loans	1,847	1,815
Residential loans | Other residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	95,621	95,526
Residential loans | Other residential | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Residential loans | Other residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	95,621	95,526
Residential loans | Other residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Residential loans | Other residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,440	27,410
Consumer loans | Installment and other consumer | Purchased credit-impaired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit-impaired	0	0
Consumer loans | Installment and other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	25,339	27,287
Consumer loans | Installment and other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 101	$ 123

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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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