Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investment Securities
Fair Value, Less than 12 months	$ 743,850	$ 740,244
Gross Unrealized Loss , Less than 12 months	(4,713)	(13,259)
Fair Value, 12 months or more	382,176	566,013
Gross Unrealized Loss , 12 months or more	(52,243)	(128,715)
Fair Value, Total	1,126,026	1,306,257
Gross Unrealized Loss , Total	(56,956)	(141,974)
U.S. government agency securities
Investment Securities
Fair Value, Less than 12 months	547,360	494,885
Gross Unrealized Loss , Less than 12 months	(2,712)	(1,908)
Fair Value, 12 months or more	71,347	714
Gross Unrealized Loss , 12 months or more	(807)	(9)
Fair Value, Total	618,707	495,599
Gross Unrealized Loss , Total	(3,519)	(1,917)
Mortgage-backed securities - residential
Investment Securities
Fair Value, Less than 12 months	191,440	209,078
Gross Unrealized Loss , Less than 12 months	(1,976)	(8,956)
Fair Value, 12 months or more	165,468	441,502
Gross Unrealized Loss , 12 months or more	(30,387)	(108,321)
Fair Value, Total	356,908	650,580
Gross Unrealized Loss , Total	(32,363)	(117,277)
Mortgage-backed securities - commercial
Investment Securities
Fair Value, Less than 12 months	0	2,222
Gross Unrealized Loss , Less than 12 months	0	(19)
Fair Value, 12 months or more	8,795	12,635
Gross Unrealized Loss , 12 months or more	(528)	(1,089)
Fair Value, Total	8,795	14,857
Gross Unrealized Loss , Total	(528)	(1,108)
Municipal securities
Investment Securities
Fair Value, Less than 12 months	5,050	34,059
Gross Unrealized Loss , Less than 12 months	(25)	(2,376)
Fair Value, 12 months or more	135,571	110,173
Gross Unrealized Loss , 12 months or more	(20,516)	(19,285)
Fair Value, Total	140,621	144,232
Gross Unrealized Loss , Total	(20,541)	(21,661)
Corporate securities
Investment Securities
Fair Value, Less than 12 months	0	0
Gross Unrealized Loss , Less than 12 months	0	0
Fair Value, 12 months or more	995	989
Gross Unrealized Loss , 12 months or more	(5)	(11)
Fair Value, Total	995	989
Gross Unrealized Loss , Total	$ (5)	$ (11)

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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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