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Allowance for Loan Losses - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of the period |  |  |  | $ 16,394 |  |  |  | $ 14,837 | $ 16,394 | $ 14,837 | $ 14,534
Total loans charged-off |  |  |  |  |  |  |  |  | 2,552 | 2,253 | 2,660
Total loan recoveries |  |  |  |  |  |  |  |  | 1,072 | 1,340 | 1,121
Net loans charged-off |  |  |  |  |  |  |  |  | 1,480 | 913 | 1,539
Total provision charged to operating expense | $ 528 | $ 1,176 | $ 635 | $ 567 | $ 1,100 | $ 710 | $ 330 | $ 330 | 2,906 | 2,470 | 1,842
Balance at the end of the period | $ 17,820 |  |  |  | $ 16,394 |  |  |  | 17,820 | 16,394 | 14,837
Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 473 | 629 | 758
Total loan recoveries |  |  |  |  |  |  |  |  | 176 | 298 | 210
Total provision charged to operating expense |  |  |  |  |  |  |  |  | 1,699 | 2,164 | (68)
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 112 | 68 | 181
Total loan recoveries |  |  |  |  |  |  |  |  | 59 | 9 | 31
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  |  | 20 | 471
Total loan recoveries |  |  |  |  |  |  |  |  | 29 | 32 | 55
Commercial [Member] | Residential Spec Homes [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loan recoveries |  |  |  |  |  |  |  |  | 8 | 8 | 8
Commercial [Member] | Development & Spec Land [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  |  | 1 |
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 361 | 540 | 106
Total loan recoveries |  |  |  |  |  |  |  |  | 80 | 249 | 116
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 76 | 89 | 213
Total loan recoveries |  |  |  |  |  |  |  |  | 27 | 44 | 97
Total provision charged to operating expense |  |  |  |  |  |  |  |  | (487) | (81) | (23)
Real Estate [Member] | Residential Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 76 | 89 | 213
Total loan recoveries |  |  |  |  |  |  |  |  | 27 | 44 | 97
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 2,003 | 1,535 | 1,689
Total loan recoveries |  |  |  |  |  |  |  |  | 869 | 998 | 814
Total provision charged to operating expense |  |  |  |  |  |  |  |  | 1,694 | 387 | 1,933
Consumer [Member] | Direct Installment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 154 | 137 | 329
Total loan recoveries |  |  |  |  |  |  |  |  | 53 | 501 | 81
Consumer [Member] | Indirect Installment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 1,673 | 1,193 | 1,051
Total loan recoveries |  |  |  |  |  |  |  |  | 505 | 497 | 529
Consumer [Member] | Home Equity Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total loans charged-off |  |  |  |  |  |  |  |  | 176 | $ 205 | 309
Total loan recoveries |  |  |  |  |  |  |  |  | $ 311 |  | $ 204

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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 loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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