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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | $ 452,842 |  | $ 452,842 |  | $ 432,535 |  |  |
Valuation allowance | 9,093 | $ 7,489 | 9,093 | $ 7,489 | 8,308 | $ 8,714 | $ 7,307 | $ 9,208
Provision for credit losses | 100 | 0 | 600 | (400) |  |  |  |
Carrying Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 452,842 |  | 452,842 |  | 432,535 |  |  |
Loans receivable | 590,197 |  | 590,197 |  | 564,280 |  |  |
Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,641 |  | 7,641 |  | 7,585 |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 445,201 |  | 445,201 |  | 424,950 |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Loans receivable | 587,752 |  | 587,752 |  | 564,667 |  |  |
Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 452,842 |  | 452,842 |  | 432,535 |  |  |
Loans receivable | 587,752 |  | 587,752 |  | 564,667 |  |  |
Valuation allowance |  |  |  |  | 3,921 |  |  |
Loans, recoveries |  | 131 |  |  |  |  |  |
Loans, charge-offs | 0 |  | 0 | 177 | 3,539 |  |  |
Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other real estate owned | 0 |  | 0 |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other real estate owned | 0 |  | 0 |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other real estate owned | 0 |  | 0 |  |  |  |  |
Assets, fair value | 151 |  | 151 |  | 7,796 |  |  |
Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other real estate owned | 0 |  | 0 |  |  |  |  |
Assets, fair value | 151 |  | 151 |  | 7,796 |  |  |
Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 7,641 |  | 7,641 |  | 7,585 |  |  |
Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 445,201 |  | 445,201 |  | 424,950 |  |  |
Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 452,842 |  | 452,842 |  | 432,535 |  |  |
U.S. Government agencies | Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
U.S. Government agencies | Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 51,914 |  | 51,914 |  | 33,090 |  |  |
U.S. Government agencies | Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
U.S. Government agencies | Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 51,914 |  | 51,914 |  | 33,090 |  |  |
Obligations of states and political subdivisions | Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Obligations of states and political subdivisions | Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 178,999 |  | 178,999 |  | 149,295 |  |  |
Obligations of states and political subdivisions | Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Obligations of states and political subdivisions | Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 178,999 |  | 178,999 |  | 149,295 |  |  |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 210,543 |  | 210,543 |  | 237,872 |  |  |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 210,543 |  | 210,543 |  | 237,872 |  |  |
Private label residential mortgage backed securities | Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Private label residential mortgage backed securities | Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 3,745 |  | 3,745 |  | 4,693 |  |  |
Private label residential mortgage backed securities | Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Private label residential mortgage backed securities | Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 3,745 |  | 3,745 |  | 4,693 |  |  |
Other equity securities | Recurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,641 |  | 7,641 |  | 7,585 |  |  |
Other equity securities | Recurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Other equity securities | Recurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Other equity securities | Recurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,641 |  | 7,641 |  | 7,585 |  |  |
Impaired loans | Nonrecurring | Carrying Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 184 |  | 184 |  | 8,239 |  |  |
Valuation allowance | 33 |  | 33 |  | 443 |  |  |
Impaired loans | Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Impaired loans | Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Impaired loans | Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 151 |  | 151 |  | 7,796 |  |  |
Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 151 |  | 151 |  | 7,796 |  |  |
Commercial |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 3,623 | 2,157 | 3,623 | 2,157 | 3,130 | 3,553 | 1,874 | 2,444
Provision for credit losses | (186) | 243 | 731 | 768 |  |  |  |
Commercial | Impaired loans | Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Commercial | Impaired loans | Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Commercial | Impaired loans | Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 9 |  | 9 |  | 7,019 |  |  |
Commercial | Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 9 |  | 9 |  | 7,019 |  |  |
Real Estate Portfolio Segment |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 4,591 | 4,195 | 4,591 | 4,195 | 4,058 | 4,429 | 4,157 | 5,174
Provision for credit losses | 154 | (121) | 509 | (970) |  |  |  |
Consumer |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 774 | 879 | 774 | 879 | 1,078 | $ 732 | $ 981 | $ 1,168
Provision for credit losses | 27 | $ (85) | (703) | $ (34) |  |  |  |
Consumer | Impaired loans | Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Consumer | Impaired loans | Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Consumer | Impaired loans | Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 777 |  |  |
Consumer | Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 777 |  |  |
Commercial and industrial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 9 |  | 9 |  |  |  |  |
Commercial and industrial | Impaired loans | Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Commercial and industrial | Impaired loans | Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Commercial and industrial | Impaired loans | Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 9 |  | 9 |  | 7,019 |  |  |
Commercial and industrial | Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 7,019 |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 142 |  | 142 |  |  |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | $ 142 |  | $ 142 |  | 777 |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | $ 777 |  |  |

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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