Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Investment Securities
Fair Value, Less than 12 months	$ 531,485	$ 377,292
Gross Unrealized Loss , Less than 12 months	(18,499)	(1,078)
Fair Value, 12 months or more	598,815	626,005
Gross Unrealized Loss , 12 months or more	(68,185)	(48,589)
Fair Value, Total	1,130,300	1,003,297
Gross Unrealized Loss , Total	(86,684)	(49,667)
U.S. government agency securities
Investment Securities
Fair Value, Less than 12 months	69,887	274,195
Gross Unrealized Loss , Less than 12 months	(2,083)	(500)
Fair Value, 12 months or more	341,129	275,887
Gross Unrealized Loss , 12 months or more	(802)	(1,685)
Fair Value, Total	411,016	550,082
Gross Unrealized Loss , Total	(2,885)	(2,185)
Mortgage-backed securities - residential
Investment Securities
Fair Value, Less than 12 months	399,394	97,187
Gross Unrealized Loss , Less than 12 months	(12,446)	(567)
Fair Value, 12 months or more	141,459	207,127
Gross Unrealized Loss , 12 months or more	(36,021)	(29,114)
Fair Value, Total	540,853	304,314
Gross Unrealized Loss , Total	(48,467)	(29,681)
Mortgage-backed securities - commercial
Investment Securities
Fair Value, Less than 12 months	11,066	1,898
Gross Unrealized Loss , Less than 12 months	(604)	(9)
Fair Value, 12 months or more	7,578	8,780
Gross Unrealized Loss , 12 months or more	(620)	(477)
Fair Value, Total	18,644	10,678
Gross Unrealized Loss , Total	(1,224)	(486)
Municipal securities
Investment Securities
Fair Value, Less than 12 months	43,184	4,012
Gross Unrealized Loss , Less than 12 months	(3,150)	(2)
Fair Value, 12 months or more	108,649	133,213
Gross Unrealized Loss , 12 months or more	(30,742)	(17,311)
Fair Value, Total	151,833	137,225
Gross Unrealized Loss , Total	(33,892)	(17,313)
U.S. Treasury securities
Investment Securities
Fair Value, Less than 12 months	6,964
Gross Unrealized Loss , Less than 12 months	(206)
Fair Value, 12 months or more	0
Gross Unrealized Loss , 12 months or more	0
Fair Value, Total	6,964
Gross Unrealized Loss , Total	(206)
Corporate securities
Investment Securities
Fair Value, Less than 12 months	990	0
Gross Unrealized Loss , Less than 12 months	(10)	0
Fair Value, 12 months or more	0	998
Gross Unrealized Loss , 12 months or more	0	(2)
Fair Value, Total	990	998
Gross Unrealized Loss , Total	$ (10)	$ (2)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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