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Fair Value of Financial Instruments and Fair Value Measurements (Details 1) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Estimated fair value | $ 374,426 | $ 353,438
Derivative financial instruments | 553 | 797
Common stocks [Member] |  |
Assets: |  |
Estimated fair value | 1,002 | 1,486
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Derivative financial instruments | 553 | 797
Fair Value, Measurements, Recurring [Member] | Common stocks [Member] |  |
Assets: |  |
Estimated fair value | 1,002 | 1,486
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] |  |
Assets: |  |
Estimated fair value | 92,869 | 85,985
U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 27,349 | 29,920
Municipal obligations, tax exempt [Member] |  |
Assets: |  |
Estimated fair value | 163,848 | 137,941
Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 163,848 | 137,941
Municipal obligations, taxable [Member] |  |
Assets: |  |
Estimated fair value | 73,628 | 81,890
Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 73,628 | 81,890
U. S. treasury securities [Member] |  |
Assets: |  |
Estimated fair value | 6,030 | 6,517
U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 6,030 | 6,517
Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 9,700 | 9,699
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Estimated fair value | 7,032 | 8,003
Derivative financial instruments | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Derivative financial instruments | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member] |  |
Assets: |  |
Estimated fair value | 1,002 | 1,486
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 6,030 | 6,517
Fair Value, Inputs, Level 1 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Estimated fair value | 367,394 | 345,435
Derivative financial instruments | 553 | 797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Derivative financial instruments | 553 | 797
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] |  |
Assets: |  |
Estimated fair value | 92,869 | 85,985
Fair Value, Inputs, Level 2 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 27,349 | 29,920
Fair Value, Inputs, Level 2 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 163,848 | 137,941
Fair Value, Inputs, Level 2 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 73,628 | 81,890
Fair Value, Inputs, Level 2 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 9,700 | 9,699
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Derivative financial instruments | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Derivative financial instruments | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Estimated fair value | $ 0 | $ 0

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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