Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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Investment securities pledged as collateral carrying value.

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Maximum investment in any single non-federal issuer representing shareholder's equity.

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Number Of Investments In Non Federal Issuer Representing More Than Specified Percentage Of Equity

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Number Of Securities

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Pledging requirement for credit derivatives and SWAP agreements - securities.

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Investment Securities - Narrative (Detail) $ in Thousands	9 Months Ended
Investment Securities - Narrative (Detail) $ in Thousands	Sep. 30, 2020 USD ($) Investment loan	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) Investment
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged to secure public deposits and other contractual obligations	$ 289,600				$ 340,800
Pledging requirements for credit derivatives and SWAP agreements - securities	$ 38,900				$ 12,500
Number of investments in non federal issuer representing more than 10% of shareholder's equity \| Investment	0				0
Maximum investment in any single non-federal issuer representing shareholders equity	10.00%				10.00%
Fair value of securites AFS in unrealized loss position for which an ACL has not been recorded	$ 13,758				$ 138,598
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	64				5,505
Proceeds from sales	65,621	$ 24,987
Debt securities, available-for-sale, allowance for credit loss	692
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	0
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value of securites AFS in unrealized loss position for which an ACL has not been recorded	8,779				70,499
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	$ 61				475
Number of securities \| loan	4
Debt securities, available-for-sale, allowance for credit loss	$ 0
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value of securites AFS in unrealized loss position for which an ACL has not been recorded					66,504
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded					5,007
Number of securities \| Investment	8
Debt securities, available-for-sale, allowance for credit loss	$ 692		$ 855	$ 0	$ 0
Provision for credit losses, securities	392
Other Noninterest Income [Member] \| Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Net realized gain on investment securities	$ (321)	$ 12