Investment Securities - Narrative (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) Investment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Investment	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Carrying value of securities pledged to secure public deposits and other contractual obligations	$ 414,200		$ 281,700
Pledging requirements for credit derivatives and SWAP agreements - securities		$ 0	$ 23,000
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 HTM in unrealized loss with no ACL	$ 140,432		$ 89,837
Unrealized loss included in fair value of securities HTM in unrealized loss position for which an ACL has not been recorded	14,027		984
Fair value AFS in unrealized loss with no ACL	260,463		179,992
Unrealized loss included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded	30,508		2,300
Fair value of securities AFS in unrealized loss position for which an ACL has been recorded, net of allowance	82,000
Unrealized loss position included in fair value of securities AFS in unrealized loss position for which an ACL has been recorded	7,800
Allowance for credit losses	1,692		929
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value AFS in unrealized loss with no ACL			779
Unrealized loss included in fair value of securities AFS in unrealized loss position for which an ACL has not been recorded			1
Allowance for credit losses	$ 1,692	485	$ 929	$ 869
Number of securities | Investment	38
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 874
Allowance for credit losses	1,700
Held-to-maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	345
Other Noninterest Income [Member] | Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Net realized gain on investment securities	$ (197)	$ 139