Investment Securities - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Position Security	Dec. 31, 2022 USD ($) Position Security
Schedule Of Available For Sale Securities [Line Items]
Equity securities, at fair value	$ 4,074,000	$ 311,000
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	$ 831,000,000	770,000,000
Available-for-sale, 12 months or longer, Fair Value	1,075,835,000	677,083,000
12 months or longer, unrealized losses	$ 192,616,000	$ 143,282,000
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	36	16
Available-for-sale, 12 months or longer, Fair Value	$ 210,069,000	$ 163,520,000
12 months or longer, unrealized losses	$ 26,215,000	$ 28,914,000
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	237	36
Available-for-sale, 12 months or longer, Fair Value	$ 241,630,000	$ 45,419,000
12 months or longer, unrealized losses	$ 49,038,000	$ 16,624,000
Mortgage-backed Securities: GSE Residential
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	263	91
Available-for-sale, 12 months or longer, Fair Value	$ 566,197,000	$ 461,446,000
12 months or longer, unrealized losses	$ 113,007,000	$ 96,900,000
Other Securities
Schedule Of Available For Sale Securities [Line Items]
Number of securities in unrealized loss positions | Security	43	5
Available-for-sale, 12 months or longer, Fair Value	$ 57,939,000	$ 6,698,000
12 months or longer, unrealized losses	$ 4,356,000	$ 844,000