Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 439,390		$ 453,629
Gross unrealized gains	21,305		14,467
Gross unrealized losses	(21)		(130)
Allowance for credit losses	(87)	$ 70	0
Held to maturity debt securities, fair value	460,587		467,966
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	6,840		6,599
Gross unrealized gains	5		11
Gross unrealized losses	(2)		(9)
Allowance for credit losses	0		0
Held to maturity debt securities, fair value	6,843		6,601
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	89		118
Gross unrealized gains	3		4
Gross unrealized losses	0		0
Allowance for credit losses	0		0
Held to maturity debt securities, fair value	92		122
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	424,166		437,074
Gross unrealized gains	21,136		14,394
Gross unrealized losses	(19)		(115)
Allowance for credit losses	(81)		0
Held to maturity debt securities, fair value	445,202		451,353
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	8,295		9,838
Gross unrealized gains	161		58
Gross unrealized losses	0		(6)
Allowance for credit losses	(6)		0
Held to maturity debt securities, fair value	$ 8,450		$ 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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