Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Less than 12 months	$ 13,639	$ 129,820
12 months or more	219,542	119,799
Total Fair Value	233,181	249,619
Unrealized Losses
Less than 12 months	(701)	(19,994)
12 months or more	(55,762)	(26,415)
Total Unrealized Losses	(56,463)	(46,409)
U.S. Treasury
Fair Value
Less than 12 months	3,568	1,908
12 months or more	1,300	244
Total Fair Value	4,868	2,152
Unrealized Losses
Less than 12 months	(10)	(41)
12 months or more	(30)	(5)
Total Unrealized Losses	(40)	(46)
U.S. government and federal agency obligations
Fair Value
Less than 12 months	0	559
12 months or more	420	0
Total Fair Value	420	559
Unrealized Losses
Less than 12 months	0	(32)
12 months or more	(26)	0
Total Unrealized Losses	(26)	(32)
U.S. government-sponsored enterprises
Fair Value
Less than 12 months	985	7,066
12 months or more	23,877	16,711
Total Fair Value	24,862	23,777
Unrealized Losses
Less than 12 months	(15)	(933)
12 months or more	(2,622)	(1,789)
Total Unrealized Losses	(2,637)	(2,722)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	3,326	79,396
12 months or more	95,609	29,370
Total Fair Value	98,935	108,766
Unrealized Losses
Less than 12 months	(380)	(15,421)
12 months or more	(32,382)	(10,133)
Total Unrealized Losses	(32,762)	(25,554)
Mortgage-backed securities
Fair Value
Less than 12 months	5,760	33,334
12 months or more	86,648	68,911
Total Fair Value	92,408	102,245
Unrealized Losses
Less than 12 months	(296)	(3,124)
12 months or more	(19,079)	(13,740)
Total Unrealized Losses	(19,375)	(16,864)
Other debt securities
Fair Value
Less than 12 months	0	7,557
12 months or more	10,534	3,386
Total Fair Value	10,534	10,943
Unrealized Losses
Less than 12 months	0	(443)
12 months or more	(1,291)	(439)
Total Unrealized Losses	(1,291)	(882)
Bank issued trust preferred securities
Fair Value
Less than 12 months	0	0
12 months or more	1,154	1,177
Total Fair Value	1,154	1,177
Unrealized Losses
Less than 12 months	0	0
12 months or more	(332)	(309)
Total Unrealized Losses	$ (332)	$ (309)