Funds Borrowed - Summary of Time Deposits of $100,000 or More (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Banking and Thrift [Abstract]
Three months or less	$ 126,721
Over three months through six months	72,280
Over six months through one year	218,150
Over one year	529,824
Total deposits	$ 946,975

No definition available.

Name:	us-gaap_BankingAndThriftAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more, maturing after twelve months from the balance sheet date.

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