Interest and Dividends Receivable - Summary of Interest and Dividends Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Interest and dividends receivable, Loans	$ 15,905	$ 10,750
Interest and dividends receivable, Investment securities and other	2,490	2,430
Interest and dividends receivable, Mortgage-backed securities	1,294	1,074
Interest and dividends receivable	$ 19,689	$ 14,254

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_InterestReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant