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Loans and Allowance for Loan Losses - Summary of Recorded Investment in Loans Impairment Method and Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Reserves: |  |  |  |
Loan losses, Reserves | $ 11,420 | $ 11,420 |  | $ 14,162
Loans evaluated for impairment: |  |  |  |
Loans, Individually evaluated for impairment | 3,950 | 3,950 |  | 6,133
Loans, Collectively evaluated for impairment | 1,192,256 | 1,192,256 |  | 1,103,583
Total loans, gross | 1,196,522 | 1,196,522 |  | 1,110,446
Allowance for loan losses: |  |  |  |
Allowance for loan losses, Beginning balance | 10,627 | 14,162 | $ 10,023 | 10,023
Allowance for loan losses, Provisions |  | (3,488) | 3,599 | 4,974
Allowance for loan losses, Charge-offs |  |  | (223) | (835)
Allowance for loan losses, Recoveries | 93 | 746 |  |
Allowance for loan losses, Ending balance | 11,420 | 11,420 | 13,399 | 14,162
Loans Acquired with Deteriorated Credit Quality |  |  |  |
Loans evaluated for impairment: |  |  |  |
Loans acquired | 316 | 316 |  | 730
Specific Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves |  |  |  | 1,782
General Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 11,420 | 11,420 |  | 12,380
Real Estate |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 7,672 | 7,672 |  | 8,111
Loans evaluated for impairment: |  |  |  |
Loans, Individually evaluated for impairment | 2,580 | 2,580 |  | 2,556
Loans, Collectively evaluated for impairment | 819,654 | 819,654 |  | 744,349
Total loans, gross | 822,550 | 822,550 |  | 747,635
Allowance for loan losses: |  |  |  |
Allowance for loan losses, Beginning balance | 6,433 | 8,111 | 5,788 | 5,788
Allowance for loan losses, Provisions |  |  |  | 2,323
Allowance for loan losses, Ending balance | 7,672 | 7,672 | 10,275 | 8,111
Real Estate | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Loans evaluated for impairment: |  |  |  |
Loans acquired | 316 | 316 |  | 730
Real Estate | General Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 7,672 | 7,672 |  | 8,111
Commercial |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 3,362 | 3,362 |  | 6,051
Loans evaluated for impairment: |  |  |  |
Loans, Individually evaluated for impairment | 1,370 | 1,370 |  | 3,577
Loans, Collectively evaluated for impairment | 372,602 | 372,602 |  | 359,234
Total loans, gross | 373,972 | 373,972 |  | 362,811
Allowance for loan losses: |  |  |  |
Allowance for loan losses, Beginning balance | 3,384 | 6,051 | 4,235 | 4,235
Allowance for loan losses, Provisions |  |  |  | 2,651
Allowance for loan losses, Charge-offs |  |  | (223) | (835)
Allowance for loan losses, Recoveries | 93 | 746 |  |
Allowance for loan losses, Ending balance | 3,362 | 3,362 | $ 3,124 | 6,051
Commercial | Specific Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves |  |  |  | 1,782
Commercial | General Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 3,362 | 3,362 |  | $ 4,269
Unallocated |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | 386 | 386 |  |
Allowance for loan losses: |  |  |  |
Allowance for loan losses, Beginning balance | 810 |  |  |
Allowance for loan losses, Ending balance | 386 | 386 |  |
Unallocated | General Reserves |  |  |  |
Reserves: |  |  |  |
Loan losses, Reserves | $ 386 | $ 386 |  |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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=84173941&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=84173941&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 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: 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=82894903&loc=d3e15032-111544 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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