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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,373,444	$ 1,367,123
Gross Unrealized Gains	7,931	3,835
Gross Unrealized Losses	122,033	139,426
Fair Value	1,259,342	1,231,532
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	75,232	75,141
Gross Unrealized Gains	218	140
Gross Unrealized Losses	2,941	3,784
Fair Value	72,509	71,497
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	399,006	398,648
Gross Unrealized Gains	4,751	2,008
Gross Unrealized Losses	16,309	20,376
Fair Value	387,448	380,280
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,483	86,328
Gross Unrealized Gains	5	4
Gross Unrealized Losses	8,605	8,638
Fair Value	76,883	77,694
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	65,124	68,130
Gross Unrealized Gains	6	3
Gross Unrealized Losses	4,479	4,879
Fair Value	60,651	63,254
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	746,099	736,376
Gross Unrealized Gains	2,951	1,680
Gross Unrealized Losses	89,677	101,696
Fair Value	659,373	636,360
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,500	2,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	22	53
Fair Value	$ 2,478	$ 2,447

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- 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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