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Deposits - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Banking and Thrift [Abstract]
Time deposits, $250,000 and over	$ 147.6	$ 124.3

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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Name:	us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
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Balance Type:	credit
Period Type:	instant