Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,051,916	$ 1,126,144
Gross Unrealized Gains	26	3
Gross Unrealized Losses	(75,252)	(123,603)
Fair Value	976,690	1,002,544
Allowance for credit losses - held to maturity securities	(32)	(32)
Held to maturity securities, net of allowance for credit losses	1,051,884	1,126,112
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	280,536	284,542
Gross Unrealized Gains	26	3
Gross Unrealized Losses	(33,585)	(42,491)
Fair Value	246,977	242,054
Residential mortgage backed securities:
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	327,592	354,882
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(19,529)	(41,506)
Fair Value	308,063	313,376
Residential mortgage backed securities: | Mortgage backed securities issued by U.S. Government agencies or sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	336,382	372,414
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11,384)	(25,251)
Fair Value	324,998	347,163
Commercial mortgage backed securities: | Mortgage backed securities issued by U.S. Government agencies or sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	16,944	16,961
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,185)	(2,958)
Fair Value	14,759	14,003
Commercial mortgage backed securities: | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	42,372	43,662
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,129)	(7,317)
Fair Value	36,243	36,345
Other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	48,090	53,683
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,440)	(4,080)
Fair Value	$ 45,650	$ 49,603