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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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 - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Investment	Dec. 31, 2019 USD ($) Investment	Dec. 31, 2018 USD ($)	Jan. 01, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged to secure public deposits and other contractual obligations	$ 249,600	$ 340,800
Pledging requirements for credit derivatives and SWAP agreements - securities	$ 32,600	$ 12,500
Number of investments in non-federal issuer representing more than 10% of shareholders' equity \| Investment	0	0
Maximum investment in any single non-federal issuer representing shareholders' equity	10.00%	10.00%
Fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	$ 18,253	$ 138,598
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	78	5,505
Fair value AFS in unrealized loss with an ACL	58,700
Available-for-sale securities in unrealized loss position, accumulated loss	5,500
Securities, available-for-sale, allowance for credit loss	869
Proceeds from sales	66,421	26,494	$ 1,010
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	$ 0	0
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value of securities 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	7
Securities, available-for-sale, allowance for credit loss	$ 869	0		$ 0
Provision for credit loss, AFS securities	569
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	13,708	70,499
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	$ 63	475
Number of securities \| Investment	4
Securities, available-for-sale, allowance for credit loss	$ 0
Other Noninterest Income [Member] \| Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Net realized gain/loss on equity securities	$ (186)	$ 80