Investment Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Position Security	Dec. 31, 2021 USD ($) Position Security
Schedule Of Available For Sale Securities [Line Items]
Equity securities, at fair value	$ 311,000	$ 397,000
Tax rate used to calculate tax-equivalent yields (in hundredths)	21.00%
Percentage investment book value exceeds stockholders' equity (in hundredths)	10.00%
Debt securities, available-for-sale, restricted	$ 770,000,000	590,000,000
Available-for-sale, 12 months or longer, Fair Value	677,083,000	186,350,000
12 months or longer, unrealized losses	$ 143,282,000	$ 4,627,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	16	6
Available-for-sale, 12 months or longer, Fair Value	$ 163,520,000	$ 139,846,000
12 months or longer, unrealized losses	$ 28,914,000	$ 2,936,000
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | Position	0	0
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	36	0
Available-for-sale, 12 months or longer, Fair Value	$ 45,419,000	$ 0
12 months or longer, unrealized losses	$ 16,624,000	$ 0
Mortgage-backed Securities: GSE Residential
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	91	15
Available-for-sale, 12 months or longer, Fair Value	$ 461,446,000	$ 46,504,000
12 months or longer, unrealized losses	$ 96,900,000	$ 1,691,000
Other Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	5	0
Available-for-sale, 12 months or longer, Fair Value	$ 6,698,000	$ 0
12 months or longer, unrealized losses	$ 844,000	$ 0