Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 421,992	$ 436,189
Gross unrealized gains	3,412	14,482
Gross unrealized losses	(7,740)	(962)
Held-to-maturity, debt securities	417,664	449,709
Held-to-maturity, debt securities, allowance	34	39
U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	1,430
Gross unrealized gains	0
Gross unrealized losses	0
Held-to-maturity, debt securities	1,430
Agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,997	9,996
Gross unrealized gains	0	0
Gross unrealized losses	(622)	(175)
Held-to-maturity, debt securities	9,375	9,821
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	13	21
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Held-to-maturity, debt securities	13	21
Held-to-maturity, debt securities, allowance	34	39
State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	400,629	415,724
Gross unrealized gains	3,411	14,463
Gross unrealized losses	(6,625)	(635)
Held-to-maturity, debt securities	397,415	429,552
Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,923	10,448
Gross unrealized gains	1	19
Gross unrealized losses	(493)	(152)
Held-to-maturity, debt securities	$ 9,431	$ 10,315

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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