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Loans and Allowance for Loan Losses - Credit Quality of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1,363,200 | $ 1,363,351
Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 3,674 | 5,192
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,304,586 | 1,293,968
Pass | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 3,249 | 2,210
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 34,590 | 33,146
Special Mention | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 0 | 1,140
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 24,024 | 36,237
Substandard | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 425 | 1,842
Commercial loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 189,783 | 209,899
Total loans | 189,967 | 210,223
Commercial loans | Commercial and industrial | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 184 | 324
Commercial loans | Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 166,622 | 197,659
Commercial loans | Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 18,288 | 6,776
Commercial loans | Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 4,873 | 5,464
Commercial real estate loans | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 237,646 | 227,989
Total loans | 239,335 | 230,605
Commercial real estate loans | Commercial real estate, owner-occupied | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 1,689 | 2,616
Commercial real estate loans | Commercial real estate, owner-occupied | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 216,017 | 205,820
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 12,445 | 10,406
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 9,184 | 11,763
Commercial real estate loans | Commercial real estate, investor |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 669,947 | 671,325
Total loans | 671,677 | 673,499
Commercial real estate loans | Commercial real estate, investor | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 1,731 | 2,174
Commercial real estate loans | Commercial real estate, investor | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 662,858 | 651,548
Commercial real estate loans | Commercial real estate, investor | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 2,438 | 13,304
Commercial real estate loans | Commercial real estate, investor | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 4,651 | 6,473
Commercial real estate loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 54,918 | 48,402
Total loans | 54,921 | 48,413
Commercial real estate loans | Construction | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 2 | 11
Commercial real estate loans | Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 51,680 | 41,710
Commercial real estate loans | Construction | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 0 | 1,008
Commercial real estate loans | Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 3,238 | 5,684
Residential loans | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 113,663 | 110,721
Total loans | 113,731 | 110,788
Residential loans | Home equity | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 68 | 67
Residential loans | Home equity | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 111,020 | 107,933
Residential loans | Home equity | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 1,419 | 322
Residential loans | Home equity | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 1,224 | 2,466
Residential loans | Other residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 71,682 | 73,035
Residential loans | Other residential | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 0 | 0
Residential loans | Other residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 71,596 | 70,987
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 | 86 | 2,048
Consumer loans | Installment and other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 21,887 | 16,788
Consumer loans | Installment and other consumer | Purchase credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchase credit-impaired | 0 | 0
Consumer loans | Installment and other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 21,544 | 16,101
Consumer loans | Installment and other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 190
Consumer loans | Installment and other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 343 | $ 497

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