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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | $ 551,075 |  | $ 551,075 |  | $ 477,554 |  |  |
Valuation allowance | 9,299 | $ 9,093 | 9,299 | $ 9,093 | 9,610 | $ 9,872 | $ 8,714 | $ 8,308
Provision for credit losses | (1,000) | 100 | (5,850) | 600 |  |  |  |
Carrying Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 551,075 |  | 551,075 |  | 477,554 |  |  |
Loans receivable | 620,528 |  | 620,528 |  | 588,501 |  |  |
Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 551,075 |  | 551,075 |  | 477,554 |  |  |
Loans receivable | 625,587 |  | 625,587 |  | 585,737 |  |  |
Valuation allowance | 35 |  | 35 |  | 0 |  |  |
Loans, charge-offs |  |  | 0 | 0 | 0 |  |  |
Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other assets | 363 |  | 363 |  |  |  |  |
Assets, fair value | 386 |  | 386 |  | 132 |  |  |
Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 551,075 |  | 551,075 |  | 477,554 |  |  |
U.S. Government agencies | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 48,266 |  | 48,266 |  | 52,901 |  |  |
Obligations of states and political subdivisions | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 242,208 |  | 242,208 |  | 188,268 |  |  |
U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 249,966 |  | 249,966 |  | 225,259 |  |  |
Private label residential mortgage backed securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 2,959 |  | 2,959 |  | 3,590 |  |  |
Other equity securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,676 |  | 7,676 |  | 7,536 |  |  |
Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 23 |  | 23 |  | 132 |  |  |
Impaired loans | Nonrecurring | Carrying Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 58 |  | 58 |  | 166 |  |  |
Valuation allowance | 35 |  | 35 |  | 34 |  |  |
Impaired loans | Nonrecurring | Fair Value |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 23 |  | 23 |  | 132 |  |  |
Commercial |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 2,318 | 3,623 | 2,318 | 3,623 | 3,562 | 2,972 | 3,553 | 3,130
Provision for credit losses | (963) | (186) | (5,787) | 731 |  |  |  |
Commercial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Real Estate Portfolio Segment |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 6,050 | 4,591 | 6,050 | 4,591 | 5,204 | 5,660 | 4,429 | 4,058
Provision for credit losses | 259 | 154 | (136) | 509 |  |  |  |
Consumer |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Valuation allowance | 912 | 774 | 912 | 774 | 734 | $ 948 | $ 732 | $ 1,078
Provision for credit losses | (23) | $ 27 | 164 | $ (703) |  |  |  |
Consumer | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 132 |  |  |
Commercial and industrial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 23 |  | 23 |  | 132 |  |  |
Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,676 |  | 7,676 |  | 7,536 |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 1 | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other assets | 0 |  | 0 |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Level 1 | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 7,676 |  | 7,676 |  | 7,536 |  |  |
Level 1 | U.S. Government agencies | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 1 | Obligations of states and political subdivisions | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 1 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 1 | Private label residential mortgage backed securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 1 | Other equity securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 7,676 |  | 7,676 |  | 7,536 |  |  |
Level 1 | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 1 | Commercial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 1 | Consumer | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 1 | Commercial and industrial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 1 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
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 | 543,399 |  | 543,399 |  | 470,018 |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 2 | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other assets | 0 |  | 0 |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Level 2 | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 543,399 |  | 543,399 |  | 470,018 |  |  |
Level 2 | U.S. Government agencies | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 48,266 |  | 48,266 |  | 52,901 |  |  |
Level 2 | Obligations of states and political subdivisions | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 242,208 |  | 242,208 |  | 188,268 |  |  |
Level 2 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 249,966 |  | 249,966 |  | 225,259 |  |  |
Level 2 | Private label residential mortgage backed securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 2,959 |  | 2,959 |  | 3,590 |  |  |
Level 2 | Other equity securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 2 | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 |  | 0 |  | 0 |  |  |
Level 2 | Commercial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 2 | Consumer | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 2 | Commercial and industrial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 2 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
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 | 625,587 |  | 625,587 |  | 585,737 |  |  |
Level 3 | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Other assets | 363 |  | 363 |  |  |  |  |
Assets, fair value | 386 |  | 386 |  | 132 |  |  |
Level 3 | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0 |  |  |
Level 3 | U.S. Government agencies | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 3 | Obligations of states and political subdivisions | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 3 | U.S. Government agencies collateralized by residential mortgage obligations | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 3 | Private label residential mortgage backed securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 3 | Other equity securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale investment securities | 0 |  | 0 |  | 0 |  |  |
Level 3 | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 23 |  | 23 |  | 132 |  |  |
Level 3 | Commercial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 3 | Consumer | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 132 |  |  |
Level 3 | Commercial and industrial | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 0 |  |  |
Level 3 | Equity loans and lines of credit | Impaired loans | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | $ 23 |  | $ 23 |  | $ 132 |  |  |

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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 Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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)(2) -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 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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