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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | $ 1 |  | $ 47 |  |  |
Collectively evaluated for impairment | 16,038 |  | 13,957 |  |  |
Modified in a troubled debt restructuring | 6,471 |  | 5,689 |  |  |
Ending allowance balance | 22,510 | $ 22,122 | 19,693 | $ 17,849 | $ 17,269 | $ 16,330
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 1,967 |  | 1,238 |  |  |
Collectively evaluated for impairment | 2,371,175 |  | 2,130,228 |  |  |
Acquired with deteriorated credit quality | 1,537,474 |  | 1,349,203 |  |  |
Modified in a troubled debt restructuring | 17,744 |  | 17,303 |  |  |
Total ending loans balance | 2,391,463 |  | 2,149,848 |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 577 |  | 1,079 |  |  |
Commercial, Industrial, and Agricultural |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 47 |  |  |
Collectively evaluated for impairment | 6,343 |  | 5,868 |  |  |
Modified in a troubled debt restructuring | 237 |  | 245 |  |  |
Ending allowance balance | 6,580 | 7,143 | 6,160 | 5,356 | 5,563 | 5,428
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 1,500 |  | 1,187 |  |  |
Collectively evaluated for impairment | 847,197 |  | 742,738 |  |  |
Acquired with deteriorated credit quality | 853,495 |  | 749,138 |  |  |
Modified in a troubled debt restructuring | 4,798 |  | 5,213 |  |  |
Total ending loans balance | 853,495 |  | 749,138 |  |  |
Commercial, Industrial, and Agricultural | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Commercial mortgages |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 1 |  | 0 |  |  |
Collectively evaluated for impairment | 5,062 |  | 3,563 |  |  |
Modified in a troubled debt restructuring | 6,234 |  | 5,444 |  |  |
Ending allowance balance | 11,297 | 10,615 | 9,007 | 8,094 | 7,641 | 6,753
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 467 |  | 51 |  |  |
Collectively evaluated for impairment | 669,989 |  | 586,845 |  |  |
Acquired with deteriorated credit quality | 683,979 |  | 600,065 |  |  |
Modified in a troubled debt restructuring | 12,946 |  | 12,090 |  |  |
Total ending loans balance | 683,979 |  | 600,065 |  |  |
Commercial mortgages | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 577 |  | 1,079 |  |  |
Residential Real Estate |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 1,978 |  | 2,033 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Ending allowance balance | 1,978 | 1,900 | 2,033 | 2,008 | 1,670 | 1,653
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 760,342 |  | 713,347 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Total ending loans balance | 760,342 |  | 713,347 |  |  |
Residential Real Estate | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Consumer |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 2,323 |  | 2,179 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Ending allowance balance | 2,323 | 2,156 | 2,179 | 2,088 | 2,068 | 2,215
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 85,888 |  | 80,193 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Total ending loans balance | 85,888 |  | 80,193 |  |  |
Consumer | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Credit Cards |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 107 |  | 120 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Ending allowance balance | 107 | 101 | 120 | 111 | 142 | 93
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 7,434 |  | 6,753 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Total ending loans balance | 7,434 |  | 6,753 |  |  |
Credit Cards | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Overdrafts |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 225 |  | 194 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Ending allowance balance | 225 | $ 207 | 194 | $ 192 | $ 185 | $ 188
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 325 |  | 352 |  |  |
Modified in a troubled debt restructuring | 0 |  | 0 |  |  |
Total ending loans balance | 325 |  | 352 |  |  |
Overdrafts | Acquired with deteriorated credit quality |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Ending allowance balance | 0 |  | 0 |  |  |
Loans: |  |  |  |  |  |
Acquired with deteriorated credit quality | $ 0 |  | $ 0 |  |  |

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- Definition Allowance for loan losses ending allowance balance attributable to loans. + References No definition available. + Details
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- Definition Financing receivable allowance for credit losses modifications recorded investment. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount after allowance and 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. Includes loans held for sale. Excludes 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(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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