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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions	Jan. 01, 2019 USD ($) Office $ / shares shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Subsequent Event [Line Items]
Common stock, shares outstanding | shares		10,400,000	10,400,000
Subsequent Event [Member] | Bank of Geneva [Member]
Subsequent Event [Line Items]
Number of full-service offices | Office	6
Subsequent Event [Member] | Limberlost Bancshares, Inc. [Member]
Subsequent Event [Line Items]
Common stock issued in exchange of each outstanding share | shares	1,830
Cash payment for exchange of each share | $ / shares	$ 8,465.00
Common stock, shares outstanding | shares	1,000
Share price | $ / shares	$ 38.49
Total consideration for acquisition	$ 78.9
Cash paid for acquisition	8.5
Stock issued for acquisition	70.4
Assets acquired, loans carrying value	259.3
Liabilities assumed, deposits carrying value	206.6
Liabilities assumed, other borrowings carrying value	$ 49.5

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Number of full service offices.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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