Investment Securities - Amortized Cost of held to Maturity Debt Securities by Year of Originations and Credit Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 257,106	$ 282,143
State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	257,106	276,600
Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		3,400
Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		2,143
AAA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	42,915	48,330
AAA \| State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	42,915	44,930
AAA \| Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		3,400
AAA \| Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
AA
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	178,179	200,550
AA \| State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	178,179	199,977
AA \| Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
AA \| Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		573
A
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	15,476	22,466
A \| State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	15,476	20,896
A \| Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
A \| Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		1,570
BBB
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 \| Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		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	20,536	10,797
Not Rated \| State and municipal obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 20,536	10,797
Not Rated \| Government-agency obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		0
Not Rated \| Corporate obligations
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost		$ 0