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Business Combinations - Additional Information (Detail) - Salin Bancshares, Inc [Member] - USD ($) $ / shares in Units, $ in Millions	Oct. 29, 2018	Oct. 26, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Total assets			$ 918.4
Total deposits			752.1
Total loans			$ 595.7
Subsequent Event [Member]
Business Acquisition [Line Items]
Exchange ratio per share	23907.50%
Cash paid for each share	$ 84,417.17
Market closing price per share		$ 16.95
Estimated transaction value		$ 135.3

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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