Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 445,531		$ 453,629
Gross unrealized gains	13,940		14,467
Gross unrealized losses	(160)		(130)
Allowance for credit losses	(87)	$ 0	0
Held to maturity debt securities, fair value	459,224		467,966
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	7,417		6,599
Gross unrealized gains	15		11
Gross unrealized losses	0		(9)
Allowance for credit losses	0		0
Held to maturity debt securities, fair value	7,432		6,601
Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	104		118
Gross unrealized gains	4		4
Gross unrealized losses	0		0
Allowance for credit losses	0		0
Held to maturity debt securities, fair value	108		122
State And Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	428,691		437,074
Gross unrealized gains	13,876		14,394
Gross unrealized losses	(121)		(115)
Allowance for credit losses	(80)		0
Held to maturity debt securities, fair value	442,366		451,353
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,319		9,838
Gross unrealized gains	45		58
Gross unrealized losses	(39)		(6)
Allowance for credit losses	(7)	$ 0	0
Held to maturity debt securities, fair value	$ 9,318		$ 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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