Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 472,039	$ 479,425
Gross unrealized gains	8,873	4,334
Gross unrealized losses	(1,085)	(4,019)
Fair value	479,827	479,740
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	4,620	4,989
Gross unrealized gains	6	1
Gross unrealized losses	(56)	(94)
Fair value	4,570	4,896
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	170	187
Gross unrealized gains	3	3
Gross unrealized losses	0	0
Fair value	173	190
State And Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	456,554	463,801
Gross unrealized gains	8,850	4,329
Gross unrealized losses	(957)	(3,767)
Fair value	464,447	464,363
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,695	10,448
Gross unrealized gains	14	1
Gross unrealized losses	(72)	(158)
Fair value	$ 10,637	$ 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=109979856&loc=d3e26610-111562

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrealized loss 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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