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Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,827,749	$ 1,796,040
Gross Unrealized Gains	2,702	413
Gross Unrealized Losses	(267,767)	(279,166)
Fair Value	1,562,684	1,517,287
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,651	110,813
Gross Unrealized Gains	16	51
Gross Unrealized Losses	0	0
Fair Value	144,667	110,864
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	595,133	587,963
Gross Unrealized Gains	37	21
Gross Unrealized Losses	(136,336)	(124,815)
Fair Value	458,834	463,169
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	806,678	817,553
Gross Unrealized Gains	2,169	341
Gross Unrealized Losses	(99,422)	(115,715)
Fair Value	709,425	702,179
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	281,287	279,711
Gross Unrealized Gains	480	0
Gross Unrealized Losses	(32,009)	(38,636)
Fair Value	$ 249,758	$ 241,075

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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