Benefit Plans - Stock Options Activity (Detail) - $ / shares		12 Months Ended
Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Shares outstanding at beginning of year (in shares)	446,980	446,980	732,489	1,383,365
Shares exercised (in shares)		(975,325)	0	0
Shares forfeited or expired (in shares)		(223,033)	(285,509)	(650,876)
Shares outstanding at end of year (in shares)		1,051,787	446,980	732,489
Shares exercisable at year-end (in shares)		604,003	446,980	632,489
Weighted Average Exercise Price
Weighted average exercise price, outstanding at beginning of year (in usd per share)	$ 13	$ 13	$ 14	$ 16
Weighted average exercise price, exercised (in usd per share)		5	0	0
Weighted average exercise price, forfeited or expired (in usd per share)		14	16	18
Weighted average exercise price, outstanding at end of year (in usd per share)		7	13	14
Weighted average exercise price, exercisable at year-end (in usd per share)		$ 7	$ 13	$ 14
USAmeriBancorp, Inc.
Shares
Shares outstanding from USAB (in shares)	1,800,000	1,803,165	0	0
Shares outstanding at end of year (in shares)		813,000
Weighted Average Exercise Price
Weighted average exercise price, outstanding shares from USAB (in usd per share)	$ 5.47	$ 5	$ 0	$ 0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Acquired In Business Combination

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