Investment Securities - Amortized Cost of held to Maturity Debt Securities by Year of Originations and Credit Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 332,036	$ 363,111
U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		5,146
Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,999	11,058
State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	315,503	339,816
Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	6,534	7,091
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	55,694	60,457
AAA | U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		5,146
AAA | Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,999	11,058
AAA | State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	45,194	43,749
AAA | Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	501	504
AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	241,357	158,948
AA | U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
AA | Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
AA | State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	238,885	156,438
AA | Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,472	2,510
A
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	32,525	141,283
A | U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
A | Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
A | State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	28,989	137,231
A | Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	3,536	4,052
BBB
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
BBB | U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
BBB | Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
BBB | State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
BBB | Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,460	2,423
Not Rated | U.S. Treasury obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
Not Rated | Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	0	0
Not Rated | State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,435	2,398
Not Rated | Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 25	$ 25