Investment Securities - Schedule of Amortized, Gross Unrealized Gains and Losses, and Fair Value on Investment Securities, Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment securities available for sale:
Amortized Cost	$ 1,227,787	$ 1,460,033
Gross Unrealized Gains	2,786	205
Gross Unrealized Losses	(96,220)	(128,795)
Fair Value	1,134,353	1,331,443
Investment securities held to maturity:
Amortized Cost	(739,442)	(766,396)
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	(76,992)	(92,962)
Fair Value	662,450	673,434
U.S. Treasury and U.S. Government-sponsored agencies
Investment securities available for sale:
Amortized Cost	16,047	68,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,297)	(5,053)
Fair Value	13,750	63,859
Investment securities held to maturity:
Amortized Cost	(151,075)	(150,936)
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	(27,701)	(33,585)
Fair Value	123,374	117,351
Municipal securities
Investment securities available for sale:
Amortized Cost	92,231	171,087
Gross Unrealized Gains	9	172
Gross Unrealized Losses	(12,715)	(18,233)
Fair Value	79,525	153,026
Residential CMO and MBS
Investment securities available for sale:
Amortized Cost	555,518	479,473
Gross Unrealized Gains	2,656	0
Gross Unrealized Losses	(46,125)	(55,087)
Fair Value	512,049	424,386
Investment securities held to maturity:
Amortized Cost	(267,204)	(290,318)
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	(14,101)	(17,440)
Fair Value	253,103	272,878
Commercial CMO and MBS
Investment securities available for sale:
Amortized Cost	538,910	714,136
Gross Unrealized Gains	88	19
Gross Unrealized Losses	(34,740)	(49,734)
Fair Value	504,258	664,421
Investment securities held to maturity:
Amortized Cost	(321,163)	(325,142)
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	(35,190)	(41,937)
Fair Value	285,973	283,205
Corporate obligations
Investment securities available for sale:
Amortized Cost	7,745	4,000
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(134)	(166)
Fair Value	7,613	3,834
Other asset-backed securities
Investment securities available for sale:
Amortized Cost	17,336	22,425
Gross Unrealized Gains	31	14
Gross Unrealized Losses	(209)	(522)
Fair Value	$ 17,158	$ 21,917

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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