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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Facilities Business shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Schedule Of Accounting Policies [Line Items] |  |  |
Full service facilities maintained by bank | Facilities | 62 |  |
Number of business conduct | Business | 0 |  |
Factor considered to be significant for fair value measurement | 10.00% |  |
Accrual of interest discontinued description | Principal or interest is past due 90 days or more, and the loan is not well secured or in the process of collection, or when serious doubt exists as to the collectability of a loan, the accrual of interest is discontinued. |  |
Commercial loans as a percentage of total loan | 57.00% |  |
Residential real estate loans as a percentage of total loan | 21.00% |  |
Installment loans as a percentage of total loan | 18.00% |  |
Mortgage warehouse loans as a percentage of total loan | 3.00% |  |
Period in which loan sold by mortgage company | 30 days |  |
Minimum period loan held by mortgage company | 90 days |  |
Mortgage warehousing maximum pay off period | 30 days |  |
Costs are deferred due to the term | $ 0 |  |
Impaired loans charged off | 90 days |  |
Status of Non-Accrual of Loan | 90 days |  |
Impairment of Loan | 30 days |  |
Intangibles, Gross | $ 12,400,000 |  |
Goodwill | $ 119,880,000 | $ 76,941,000 | $ 49,600,000
Uncertain tax positions recognized | 50.00% |  |
Shares, non-dilutive | shares | 0 | 0 | 3,750
Amount available for payment of dividend | $ 8,500,000 |  |
Cash and cash equivalents maximum maturity period | 1 day |  |
Compensation expense | $ 1,700,000 | $ 608,000 | $ 643,000
Reclassifications effect on net income | $ 0 |  |
Buildings and Improvements [Member] | Minimum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Useful Life for depreciation | 3 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Useful Life for depreciation | 40 years |  |
Furniture and Equipment [Member] | Minimum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Useful Life for depreciation | 2 years |  |
Furniture and Equipment [Member] | Maximum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Useful Life for depreciation | 20 years |  |
Accounting Standards Update 2018-02 [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Stranded tax effects included in AOCI | $ 766,000 |  |

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