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Investment Securities - Schedule of Gross Unrealized Losses and Fair Value by Length of Time that the Individual Available-For-Sale Securities Have Been in a Continuous Unrealized Loss (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	244	244
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 11,084	$ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses	(65)	(4)
Investment securities available-for-sale, 12 months or greater, estimated fair value	1,432,105	1,493,993
Investment securities available-for-sale, 12 months or greater, unrealized losses	(168,566)	(161,952)
Investment securities available-for-sale, Estimated fair value	1,443,189	1,497,077
Investment securities available-for-sale, Unrealized losses	$ (168,631)	$ (161,956)
Investment securities held-to-maturity, Number of securities | security	230	228
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 3,474	$ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses	(63)	0
Investment securities held-to-maturity, 12 months or greater, estimated fair value	862,633	885,977
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(124,467)	(116,116)
Investment securities held-to-maturity, Estimated Fair Value	866,107	885,977
Investment securities held-to-maturity, Unrealized losses	$ (124,530)	$ (116,116)
U.S. treasury bonds
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	2	2
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses	0	0
Investment securities available-for-sale, 12 months or greater, estimated fair value	48,233	47,901
Investment securities available-for-sale, 12 months or greater, unrealized losses	(1,686)	(1,993)
Investment securities available-for-sale, Estimated fair value	48,233	47,901
Investment securities available-for-sale, Unrealized losses	$ (1,686)	$ (1,993)
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	76	78
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 2,904	$ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses	(5)	(4)
Investment securities available-for-sale, 12 months or greater, estimated fair value	636,422	668,313
Investment securities available-for-sale, 12 months or greater, unrealized losses	(58,858)	(57,689)
Investment securities available-for-sale, Estimated fair value	639,326	671,397
Investment securities available-for-sale, Unrealized losses	$ (58,863)	$ (57,693)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	151	149
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 8,180	$ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses	(60)	0
Investment securities available-for-sale, 12 months or greater, estimated fair value	688,525	718,042
Investment securities available-for-sale, 12 months or greater, unrealized losses	(102,206)	(96,684)
Investment securities available-for-sale, Estimated fair value	696,705	718,042
Investment securities available-for-sale, Unrealized losses	$ (102,266)	$ (96,684)
Investment securities held-to-maturity, Number of securities | security	142	142
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	0
Investment securities held-to-maturity, 12 months or greater, estimated fair value	568,040	590,063
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(87,348)	(79,980)
Investment securities held-to-maturity, Estimated Fair Value	568,040	590,063
Investment securities held-to-maturity, Unrealized losses	$ (87,348)	$ (79,980)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	13	13
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses	0	0
Investment securities available-for-sale, 12 months or greater, estimated fair value	48,938	49,564
Investment securities available-for-sale, 12 months or greater, unrealized losses	(5,080)	(4,993)
Investment securities available-for-sale, Estimated fair value	48,938	49,564
Investment securities available-for-sale, Unrealized losses	$ (5,080)	$ (4,993)
Investment securities held-to-maturity, Number of securities | security	16	16
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	0
Investment securities held-to-maturity, 12 months or greater, estimated fair value	76,966	77,360
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(13,000)	(12,867)
Investment securities held-to-maturity, Estimated Fair Value	76,966	77,360
Investment securities held-to-maturity, Unrealized losses	$ (13,000)	$ (12,867)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	1	1
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses	0	0
Investment securities available-for-sale, 12 months or greater, estimated fair value	8,306	8,490
Investment securities available-for-sale, 12 months or greater, unrealized losses	(434)	(293)
Investment securities available-for-sale, Estimated fair value	8,306	8,490
Investment securities available-for-sale, Unrealized losses	$ (434)	$ (293)
Investment securities held-to-maturity, Number of securities | security	42	40
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 3,474	$ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses	(63)	0
Investment securities held-to-maturity, 12 months or greater, estimated fair value	111,740	113,031
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(9,726)	(8,540)
Investment securities held-to-maturity, Estimated Fair Value	115,214	113,031
Investment securities held-to-maturity, Unrealized losses	$ (9,789)	$ (8,540)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	1	1
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses	0	0
Investment securities available-for-sale, 12 months or greater, estimated fair value	1,681	1,683
Investment securities available-for-sale, 12 months or greater, unrealized losses	(302)	(300)
Investment securities available-for-sale, Estimated fair value	1,681	1,683
Investment securities available-for-sale, Unrealized losses	$ (302)	$ (300)
Investment securities held-to-maturity, Number of securities | security	30	30
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	0
Investment securities held-to-maturity, 12 months or greater, estimated fair value	105,887	105,523
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(14,393)	(14,729)
Investment securities held-to-maturity, Estimated Fair Value	105,887	105,523
Investment securities held-to-maturity, Unrealized losses	$ (14,393)	$ (14,729)

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