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Securities - Available-for-Sale and Held-to-Maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Securities held-to-maturity, Amortized Cost, Due after ten years	$ 64,945
Securities, held-to-maturity, Amortized Cost, With single maturity date	64,945
Securities, held-to-maturity, Amortized Cost	72,786		$ 74,010
Securities held-to-maturity, Allowance for credit losses	(1,086)	$ (1,089)	(1,087)	$ (1,082)	$ (1,079)	$ (1,100)
Securities held-to-maturity	71,700		72,923
Securities held-to-maturity, Fair Value, Due after ten years	56,709
Securities held-to-maturity, Fair Value, With single maturity date	56,709
Debt Securities, Held-to-maturity, Fair Value, Total	63,952		65,755
Securities available-for-sale, Amortized Cost, Due in one year or less	29,953
Securities available-for-sale, Amortized Cost, Due after one years through five years	75,191
Securities available-for-sale, Amortized Cost, Due after five years through ten years	207,758
Securities available-for-sale, Amortized Cost, Due after ten years	375,596
Securities available-for-sale, Amortized Cost, With single maturity date	688,498
Securities available-for-sale	1,677,943		956,418
Securities available for sale, Fair Value, Due in one year or less	29,635
Securities available for sale, Fair Value, Due after one years through five years	71,066
Securities available for sale, Fair Value, Due after five years through ten years	198,713
Securities available for sale, Fair Value, Due after ten years	375,936
Securities available-for-sale, Fair Value, With single maturity date	675,350
Securities, available-for-sale, Fair Value	1,614,249		874,753
Basis adjustments	(2,184)		949
Designated as Hedging Instrument [Member] | Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member]
Basis adjustments	100		2,300
Total Other Securities [Member]
Securities, held-to-maturity, Amortized Cost	64,945		66,155
Debt Securities, Held-to-maturity, Fair Value, Total	56,709		58,697
Securities available-for-sale	700,666		538,429
Securities, available-for-sale, Fair Value	687,518		520,409
Collateralized Mortgage Backed Securities
Securities held-to-maturity, Amortized Cost, Without single maturity	7,841
Securities, held-to-maturity, Amortized Cost	7,841		7,855
Securities held-to-maturity, Fair Value, Without single maturity date	7,243
Debt Securities, Held-to-maturity, Fair Value, Total	7,243		7,058
Securities, available-for-sale, Amortized Cost, Without single maturity date	977,277
Securities available-for-sale	977,277		417,989
Securities available-for-sale, Fair Value, Without single maturity date	926,731
Securities, available-for-sale, Fair Value	926,731		354,344
Mutual Fund Debt Securities [Member]
Securities, available-for-sale, Amortized Cost, Without single maturity date	12,168
Securities available-for-sale	12,168		11,660
Securities available-for-sale, Fair Value, Without single maturity date	12,168
Securities, available-for-sale, Fair Value	$ 12,168		$ 11,660

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