Held to Maturity Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 453,629	$ 479,425
Gross unrealized gains	14,467	4,334
Gross unrealized losses	(130)	(4,019)
Fair value	467,966	479,740
Agency Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	6,599	4,989
Gross unrealized gains	11	1
Gross unrealized losses	(9)	(94)
Fair value	6,601	4,896
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	118	187
Gross unrealized gains	4	3
Gross unrealized losses	0	0
Fair value	122	190
State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	437,074	463,801
Gross unrealized gains	14,394	4,329
Gross unrealized losses	(115)	(3,767)
Fair value	451,353	464,363
Corporate Obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,838	10,448
Gross unrealized gains	58	1
Gross unrealized losses	(6)	(158)
Fair value	$ 9,890	$ 10,291

Amount 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 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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-Publisher FASB
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-Section 50
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-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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

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