Securities - Unrealized Loss Positions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Fair value
Less Than 12 Months, Fair Value	$ 13,573	$ 271,692
12 Months or More, Fair Value	365,904	209,967
Total Fair Value	379,477	481,659
Unrealized Loss
Less Than 12 Months, Unrealized Loss	504	12,523
12 Months or More, Unrealized Loss	33,609	32,379
Total Unrealized Loss	$ 34,113	44,902
Other information
Number of positions | security	492
Aggregate fair value	$ 379,477	481,659
Other than temporary impairment	0
U.S. Treasury securities
Fair value
Less Than 12 Months, Fair Value		50,556
12 Months or More, Fair Value	45,103	8,277
Total Fair Value	45,103	58,833
Unrealized Loss
Less Than 12 Months, Unrealized Loss		1,368
12 Months or More, Unrealized Loss	780	685
Total Unrealized Loss	780	2,053
Other information
Aggregate fair value	45,103	58,833
U.S. government agencies and corporations
Fair value
Less Than 12 Months, Fair Value		71,948
12 Months or More, Fair Value	87,094	58,326
Total Fair Value	87,094	130,274
Unrealized Loss
Less Than 12 Months, Unrealized Loss		1,578
12 Months or More, Unrealized Loss	9,313	11,389
Total Unrealized Loss	9,313	12,967
Other information
Aggregate fair value	87,094	130,274
Mortgage-backed securities
Fair value
Less Than 12 Months, Fair Value	5,528	73,301
12 Months or More, Fair Value	150,023	104,563
Total Fair Value	155,551	177,864
Unrealized Loss
Less Than 12 Months, Unrealized Loss	68	5,441
12 Months or More, Unrealized Loss	16,155	15,099
Total Unrealized Loss	16,223	20,540
Other information
Aggregate fair value	155,551	177,864
Obligations of states and political subdivisions
Fair value
Less Than 12 Months, Fair Value	4,659	60,838
12 Months or More, Fair Value	65,630	32,120
Total Fair Value	70,289	92,958
Unrealized Loss
Less Than 12 Months, Unrealized Loss	72	2,434
12 Months or More, Unrealized Loss	3,972	4,356
Total Unrealized Loss	4,044	6,790
Other information
Aggregate fair value	70,289	92,958
Corporate and other debt securities
Fair value
Less Than 12 Months, Fair Value	3,386	15,049
12 Months or More, Fair Value	18,054	6,681
Total Fair Value	21,440	21,730
Unrealized Loss
Less Than 12 Months, Unrealized Loss	364	1,702
12 Months or More, Unrealized Loss	3,389	850
Total Unrealized Loss	3,753	2,552
Other information
Aggregate fair value	$ 21,440	$ 21,730