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Loan Servicing - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2015
Receivables [Abstract] |  |  |  |
Unpaid principal balances of loans serviced for others totaled | $ 1,310,000 | $ 1,301,000 |  |
Aggregate fair value of capitalized mortgage servicing rights | 12,800 | 12,100 | $ 10,800 | $ 7,600
Mortgage servicing rights, net | 11,602 | 11,174 | 8,874 |
Bank recorded additional impairment | $ 80 | $ 110 | $ 59 |

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- Definition Capitalized mortgage service right fair value. + References No definition available. + Details
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- Definition Finite lived mortgage servicing rights net of impairment. + References No definition available. + Details
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- Definition Principal amount of service loan outstanding. + References No definition available. + Details
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- Definition The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6),(7) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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