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 accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Investment securities pledged as collateral carrying value.

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Investment Securities - Narrative (Detail) $ in Thousands	6 Months Ended
Investment Securities - Narrative (Detail) $ in Thousands	Jun. 30, 2021 USD ($) Investment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Investment	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged to secure public deposits and other contractual obligations	$ 249,200		$ 249,600
Pledging requirements for credit derivatives and SWAP agreements - securities	$ 17,700		$ 32,600
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 securities HTM in unrealized loss position for which an ACL has not been recorded	$ 8,420		$ 0
Unrealized loss included in fair value of securities HTM in unrealized loss position for which an ACL has not been recorded	159		0
Fair value of securites AFS in unrealized loss position for which an ACL has not been recorded	92,159		18,253
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	1,155		78
Fair value of securities AFS in unrealized loss position for which an ACL has been recorded	51,700
Unrealized loss position included in fair value of securities AFS in unrealized loss position for which an ACL has been recorded	299
Debt securities, available-for-sale, allowance for credit loss	485		869
Proceeds from sales	3,115	$ 63,565
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 securities HTM in unrealized loss position for which an ACL has not been recorded	8,420
Unrealized loss included in fair value of securities HTM in unrealized loss position for which an ACL has not been recorded	159
Fair value of securites AFS in unrealized loss position for which an ACL has not been recorded	91,660		13,708
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	1,154		63
Debt securities, available-for-sale, allowance for credit loss	0		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	499
Unrealized losses included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	$ 1
Number of securities \| Investment	11
Debt securities, available-for-sale, allowance for credit loss	$ 485	869	$ 869	$ 0
Provision for credit losses, securities	403
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	530
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	347
Other Noninterest Income [Member] \| Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Net realized gain on investment securities	$ 139	$ (292)