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Revenue Recognition - Summary of Noninterest Income Segregated By Revenue Streams In-scope and Out-of-scope of Topic 606 (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Noninterest income |  |  |  |
Service charges | $ 1,552 | $ 1,359 | $ 3,008 | $ 2,493
ATM/Interchange fees | 951 | 588 | 1,857 | 1,142
Wealth management fees | 911 | 836 | 1,758 | 1,688
Tax refund processing fees | 550 | 550 | 2,750 | 2,750
Other | 265 | 228 | 396 | 448
Noninterest Income (in-scope of Topic 606) | 4,229 | 3,561 | 9,769 | 8,521
Noninterest Income (out-of-scope of Topic 606) | 875 | 829 | 1,619 | 1,485
Total noninterest income | $ 5,104 | $ 4,390 | $ 11,388 | $ 10,006

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- Definition Automated teller machine and interchange fees. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue from contract with customer, other. + References No definition available. + Details
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Namespace Prefix: | civb_
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Balance Type: | credit
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- Definition Amount of revenue that is not accounted for under Topic 606. + References No definition available. + Details
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- Definition Service charges. + References No definition available. + Details
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Period Type: | duration

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- Definition Revenue from providing income tax refund processing services. + References No definition available. + Details
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Period Type: | duration

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- Definition Wealth management fees. + References No definition available. + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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