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Loans and Allowance for Loan Losses - Loan Summary (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 773,395,000 | $ 727,715,000 |
Less: Allowance for loan losses | (4,719,000) | (4,354,000) | $ (3,880,000)
Loans, net | 768,676,292 | 723,360,786 |
Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 30,885,000 | 38,277,000 |
Less: Allowance for loan losses | 0 | 0 |
Loans, net | 30,885,000 | 38,277,000 |
All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 742,510,000 | 689,438,000 |
Less: Allowance for loan losses | (4,719,000) | (4,354,000) |
Loans, net | 737,791,000 | 685,084,000 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 388,390,000 | 369,777,000 |
Less: Allowance for loan losses | (2,071,000) | (1,906,000) | (1,734,000)
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 16,881,000 | 20,050,000 |
Commercial Real Estate [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 371,509,000 | 349,727,000 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 174,040,000 | 161,694,000 |
Less: Allowance for loan losses | (1,082,000) | (1,015,000) | (906,000)
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 10,165,000 | 12,764,000 |
Consumer Real Estate [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 163,875,000 | 148,930,000 |
Construction and Land Development [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 116,181,000 | 105,478,000 |
Less: Allowance for loan losses | (733,000) | (627,000) | (690,000)
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 1,998,000 | 2,695,000 |
Construction and Land Development [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 114,183,000 | 102,783,000 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 87,400,000 | 84,951,000 |
Less: Allowance for loan losses | (795,000) | (777,000) | (524,000)
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 1,841,000 | 2,768,000 |
Commercial and Industrial [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 85,559,000 | 82,183,000 |
Consumer and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 7,384,000 | 5,815,000 |
Less: Allowance for loan losses | (38,000) | (29,000) | $ (26,000)
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 0 | 0 |
Consumer and Other [Member] | All Other Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 7,384,000 | $ 5,815,000 |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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