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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	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	244	260
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 3,084	$ 495,164
Investment securities available-for-sale, Less than 12 months, unrealized losses	(4)	(58,439)
Investment securities available-for-sale, 12 months or greater, estimated fair value	1,493,993	1,093,919
Investment securities available-for-sale, 12 months or greater, unrealized losses	(161,952)	(146,839)
Investment securities available-for-sale, Estimated fair value	1,497,077	1,589,083
Investment securities available-for-sale, Unrealized losses	$ (161,956)	$ (205,278)
Investment securities held-to-maturity, Number of securities | security	228	232
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 23,881
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	(3,228)
Investment securities held-to-maturity, 12 months or greater, estimated fair value	885,977	932,753
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(116,116)	(122,205)
Investment securities held-to-maturity, Estimated Fair Value	885,977	956,634
Investment securities held-to-maturity, Unrealized losses	$ (116,116)	$ (125,433)
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	47,901	46,327
Investment securities available-for-sale, 12 months or greater, unrealized losses	(1,993)	(3,466)
Investment securities available-for-sale, Estimated fair value	47,901	46,327
Investment securities available-for-sale, Unrealized losses	$ (1,993)	$ (3,466)
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	78	85
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 3,084	$ 490,699
Investment securities available-for-sale, Less than 12 months, unrealized losses	(4)	(58,437)
Investment securities available-for-sale, 12 months or greater, estimated fair value	668,313	179,029
Investment securities available-for-sale, 12 months or greater, unrealized losses	(57,689)	(19,612)
Investment securities available-for-sale, Estimated fair value	671,397	669,728
Investment securities available-for-sale, Unrealized losses	$ (57,693)	$ (78,049)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	149	157
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 3,994
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	718,042	808,697
Investment securities available-for-sale, 12 months or greater, unrealized losses	(96,684)	(117,072)
Investment securities available-for-sale, Estimated fair value	718,042	812,691
Investment securities available-for-sale, Unrealized losses	$ (96,684)	$ (117,072)
Investment securities held-to-maturity, Number of securities | security	142	143
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	590,063	652,667
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(79,980)	(88,390)
Investment securities held-to-maturity, Estimated Fair Value	590,063	652,667
Investment securities held-to-maturity, Unrealized losses	$ (79,980)	$ (88,390)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investment securities available-for-sale, Number of securities | security	13	14
Investment securities available-for-sale, Less than 12 months, estimated fair value	$ 0	$ 471
Investment securities available-for-sale, Less than 12 months, unrealized losses	0	(2)
Investment securities available-for-sale, 12 months or greater, estimated fair value	49,564	49,742
Investment securities available-for-sale, 12 months or greater, unrealized losses	(4,993)	(5,856)
Investment securities available-for-sale, Estimated fair value	49,564	50,213
Investment securities available-for-sale, Unrealized losses	$ (4,993)	$ (5,858)
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	77,360	80,564
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(12,867)	(11,993)
Investment securities held-to-maturity, Estimated Fair Value	77,360	80,564
Investment securities held-to-maturity, Unrealized losses	$ (12,867)	$ (11,993)
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	8,490	8,299
Investment securities available-for-sale, 12 months or greater, unrealized losses	(293)	(658)
Investment securities available-for-sale, Estimated fair value	8,490	8,299
Investment securities available-for-sale, Unrealized losses	$ (293)	$ (658)
Investment securities held-to-maturity, Number of securities | security	40	43
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 3,110
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	(45)
Investment securities held-to-maturity, 12 months or greater, estimated fair value	113,031	113,071
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(8,540)	(12,047)
Investment securities held-to-maturity, Estimated Fair Value	113,031	116,181
Investment securities held-to-maturity, Unrealized losses	$ (8,540)	$ (12,092)
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	1,683	1,825
Investment securities available-for-sale, 12 months or greater, unrealized losses	(300)	(175)
Investment securities available-for-sale, Estimated fair value	1,683	1,825
Investment securities available-for-sale, Unrealized losses	$ (300)	$ (175)
Investment securities held-to-maturity, Number of securities | security	30	30
Investment securities held-to-maturity, Less than 12 months, estimated fair value	$ 0	$ 20,771
Investment securities held-to-maturity, Less than 12 months, unrealized losses	0	(3,183)
Investment securities held-to-maturity, 12 months or greater, estimated fair value	105,523	86,451
Investment securities held-to-maturity, 12 months or greater, unrealized losses	(14,729)	(9,775)
Investment securities held-to-maturity, Estimated Fair Value	105,523	107,222
Investment securities held-to-maturity, Unrealized losses	$ (14,729)	$ (12,958)

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