Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 446,667		$ 453,629
Gross unrealized gains	21,157		14,467
Gross unrealized losses	(55)		(130)
Allowance for credit losses	(76)	$ 70	0
Held to maturity debt securities	467,693		467,966
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,100		6,599
Gross unrealized gains	4		11
Gross unrealized losses	(16)		(9)
Allowance for credit losses	0		0
Held to maturity debt securities	9,088		6,601
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	75		118
Gross unrealized gains	2		4
Gross unrealized losses	0		0
Allowance for credit losses	0		0
Held to maturity debt securities	77		122
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	428,532		437,074
Gross unrealized gains	21,018		14,394
Gross unrealized losses	(35)		(115)
Allowance for credit losses	(67)		0
Held to maturity debt securities	449,448		451,353
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	8,960		9,838
Gross unrealized gains	133		58
Gross unrealized losses	(4)		(6)
Allowance for credit losses	(9)		0
Held to maturity debt securities	$ 9,080		$ 9,890

Debt Securities, Held-To-Maturity, Net Of Allowance For Credit Losses

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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