Securities - Securities Held to Maturity (Details) - USD ($)	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	$ 343,362,000		$ 353,988,000
Debt securities, held-to-maturity, transferred unrealized loss	17,010,000		19,503,000
Debt securities, held-to-maturity, allowance for credit loss	133,000	$ 155,000	157,000	$ 155,000	$ 160,000	$ 168,000
Total securities held-to-maturity, amortized cost	360,505,000		373,648,000
Debt securities, held-to-maturity, unrealized gains	129,000		868,000
Debt securities, held-to-maturity, unrealized losses	45,996,000		55,910,000
Debt securities, held-to-maturity, fair value	314,638,000		318,606,000
U.S. agency
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	24,863,000		25,768,000
Debt securities, held-to-maturity, transferred unrealized loss	1,472,000		1,603,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	26,335,000		27,371,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	4,007,000		4,892,000
Debt securities, held-to-maturity, fair value	22,328,000		22,479,000
U.S. agency residential mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	102,733,000		108,770,000
Debt securities, held-to-maturity, transferred unrealized loss	8,933,000		9,715,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	111,666,000		118,485,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	20,019,000		23,849,000
Debt securities, held-to-maturity, fair value	91,647,000		94,636,000
U.S. agency commercial mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	4,045,000		4,146,000
Debt securities, held-to-maturity, transferred unrealized loss	118,000		153,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	4,163,000		4,299,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	328,000		460,000
Debt securities, held-to-maturity, fair value	3,835,000		3,839,000
Private label mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	7,344,000		7,302,000
Debt securities, held-to-maturity, transferred unrealized loss	218,000		302,000
Debt securities, held-to-maturity, allowance for credit loss	1,000	4,000	4,000	4,000	1,000	1,000
Total securities held-to-maturity, amortized cost	7,563,000		7,608,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	557,000		854,000
Debt securities, held-to-maturity, fair value	7,006,000		6,754,000
Obligations of states and political subdivisions
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	157,525,000		161,352,000
Debt securities, held-to-maturity, transferred unrealized loss	5,653,000		6,879,000
Debt securities, held-to-maturity, allowance for credit loss	17,000	31,000	33,000	33,000	39,000	39,000
Total securities held-to-maturity, amortized cost	163,195,000		168,264,000
Debt securities, held-to-maturity, unrealized gains	129,000		88,000
Debt securities, held-to-maturity, unrealized losses	15,895,000		18,807,000
Debt securities, held-to-maturity, fair value	147,429,000		149,545,000
Corporate
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	45,900,000		45,702,000
Debt securities, held-to-maturity, transferred unrealized loss	572,000		803,000
Debt securities, held-to-maturity, allowance for credit loss	111,000	116,000	116,000	114,000	116,000	123,000
Total securities held-to-maturity, amortized cost	46,583,000		46,621,000
Debt securities, held-to-maturity, unrealized gains	0		780,000
Debt securities, held-to-maturity, unrealized losses	5,190,000		7,033,000
Debt securities, held-to-maturity, fair value	41,393,000		40,368,000
Trust preferred
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	952,000		948,000
Debt securities, held-to-maturity, transferred unrealized loss	44,000		48,000
Debt securities, held-to-maturity, allowance for credit loss	4,000	$ 4,000	4,000	$ 4,000	$ 4,000	$ 5,000
Total securities held-to-maturity, amortized cost	1,000,000		1,000,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	0		15,000
Debt securities, held-to-maturity, fair value	$ 1,000,000		$ 985,000