Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,848,461	$ 1,796,040
Gross Unrealized Gains	5,799	413
Gross Unrealized Losses	(236,243)	(279,166)
Fair Value	1,618,017	1,517,287
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,138	110,813
Gross Unrealized Gains	37	51
Gross Unrealized Losses	0	0
Fair Value	144,175	110,864
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	603,733	587,963
Gross Unrealized Gains	605	21
Gross Unrealized Losses	(120,327)	(124,815)
Fair Value	484,011	463,169
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	788,902	817,553
Gross Unrealized Gains	4,489	341
Gross Unrealized Losses	(86,414)	(115,715)
Fair Value	706,977	702,179
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	311,688	279,711
Gross Unrealized Gains	668	0
Gross Unrealized Losses	(29,502)	(38,636)
Fair Value	$ 282,854	$ 241,075