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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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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	3 Months Ended
Investment Securities - Narrative (Detail) $ in Thousands	Mar. 31, 2020 USD ($) Investment	Mar. 31, 2019 USD ($)	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	$ 335,500			$ 340,800
Pledging requirements for credit derivatives and SWAP agreements - securities	$ 30,200			$ 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	$ 501			$ 138,598
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	1			5,505
Proceeds from sales	62,276	$ 491
Debt securities, available-for-sale, allowance for credit loss	897
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	501			70,499
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	$ 1			475
Number of securities \| Investment	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	24
Debt securities, available-for-sale, allowance for credit loss	$ 897		$ 0	$ 0
Provision for Other Credit Losses	597
Other Noninterest Income [Member] \| Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Net realized gain on investment securities	$ (268)	$ 4