Securities - Securities Held to Maturity (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	$ 358,899,000		$ 374,818,000
Debt securities, held-to-maturity, transferred unrealized loss	20,399,000		23,066,000
Debt securities, held-to-maturity, allowance for credit loss	155,000	$ 160,000	168,000	$ 168,000	$ 158,000	$ 0
Total securities held-to-maturity, amortized cost	379,453,000		398,052,000
Debt securities, held-to-maturity, unrealized gains	41,000		11,000
Debt securities, held-to-maturity, unrealized losses	70,295,000		62,645,000
Debt securities, held-to-maturity, fair value	309,199,000		335,418,000
U.S. agency
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	26,665,000		27,634,000
Debt securities, held-to-maturity, transferred unrealized loss	1,689,000		1,839,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	28,354,000		29,473,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	5,871,000		5,066,000
Debt securities, held-to-maturity, fair value	22,483,000		24,407,000
U.S. agency residential mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	110,883,000		117,650,000
Debt securities, held-to-maturity, transferred unrealized loss	9,972,000		10,845,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	120,855,000		128,495,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	28,690,000		25,239,000
Debt securities, held-to-maturity, fair value	92,165,000		103,256,000
U.S. agency commercial mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	4,537,000		4,798,000
Debt securities, held-to-maturity, transferred unrealized loss	176,000		228,000
Debt securities, held-to-maturity, allowance for credit loss	0		0
Total securities held-to-maturity, amortized cost	4,713,000		5,026,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	560,000		596,000
Debt securities, held-to-maturity, fair value	4,153,000		4,430,000
Private label mortgage-backed
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	7,286,000		7,242,000
Debt securities, held-to-maturity, transferred unrealized loss	331,000		416,000
Debt securities, held-to-maturity, allowance for credit loss	4,000	1,000	1,000	1,000	2,000	0
Total securities held-to-maturity, amortized cost	7,621,000		7,659,000
Debt securities, held-to-maturity, unrealized gains	0		0
Debt securities, held-to-maturity, unrealized losses	958,000		997,000
Debt securities, held-to-maturity, fair value	6,663,000		6,662,000
Obligations of states and political subdivisions
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	162,945,000		168,134,000
Debt securities, held-to-maturity, transferred unrealized loss	7,300,000		8,555,000
Debt securities, held-to-maturity, allowance for credit loss	33,000	39,000	39,000	39,000	30,000	0
Total securities held-to-maturity, amortized cost	170,278,000		176,728,000
Debt securities, held-to-maturity, unrealized gains	22,000		11,000
Debt securities, held-to-maturity, unrealized losses	26,454,000		25,591,000
Debt securities, held-to-maturity, fair value	143,846,000		151,148,000
Corporate
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	45,636,000		48,418,000
Debt securities, held-to-maturity, transferred unrealized loss	882,000		1,130,000
Debt securities, held-to-maturity, allowance for credit loss	114,000	116,000	123,000	123,000	121,000	0
Total securities held-to-maturity, amortized cost	46,632,000		49,671,000
Debt securities, held-to-maturity, unrealized gains	19,000		0
Debt securities, held-to-maturity, unrealized losses	7,762,000		5,156,000
Debt securities, held-to-maturity, fair value	38,889,000		44,515,000
Trust preferred
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Securities held to maturity	947,000		942,000
Debt securities, held-to-maturity, transferred unrealized loss	49,000		53,000
Debt securities, held-to-maturity, allowance for credit loss	4,000	$ 4,000	5,000	$ 5,000	$ 5,000	$ 0
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		0
Debt securities, held-to-maturity, fair value	$ 1,000,000		$ 1,000,000