Held to Maturity Debt Securities - Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 387,950	$ 436,189
Gross unrealized gains	269	14,482
Gross unrealized losses	(14,751)	(962)
Fair value	373,468	449,709
Agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,997	9,996
Gross unrealized gains	0	0
Gross unrealized losses	(1,033)	(175)
Fair value	8,964	9,821
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		21
Gross unrealized gains		0
Gross unrealized losses		0
Fair value		21
State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	366,164	415,724
Gross unrealized gains	268	14,463
Gross unrealized losses	(13,015)	(635)
Fair value	353,417	429,552
Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	11,789	10,448
Gross unrealized gains	1	19
Gross unrealized losses	(703)	(152)
Fair value	$ 11,087	$ 10,315

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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