Investment Securities - Amortized, Gross Unrealized Gains and Losses, and Fair Value on Investment Securities, Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	$ 1,022,211	$ 1,227,787
Available for Sale, Gross Unrealized Gains	831	2,786
Available for Sale, Gross Unrealized Losses	(91,794)	(96,220)
Available for Sale, Fair Value	931,248	1,134,353
Held-to-Maturity, Amortized Cost	(727,342)	(739,442)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(85,291)	(76,992)
Investment Securities, Held to Maturity, Fair Value	642,051	662,450
U.S. government and agency securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	14,945	16,047
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	(2,471)	(2,297)
Available for Sale, Fair Value	12,474	13,750
Held-to-Maturity, Amortized Cost	(151,146)	(151,075)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(29,378)	(27,701)
Investment Securities, Held to Maturity, Fair Value	121,768	123,374
Municipal securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	82,309	92,231
Available for Sale, Gross Unrealized Gains	6	9
Available for Sale, Gross Unrealized Losses	(12,595)	(12,715)
Available for Sale, Fair Value	69,720	79,525
Residential CMO and MBS(1)
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	489,451	555,518
Available for Sale, Gross Unrealized Gains	627	2,656
Available for Sale, Gross Unrealized Losses	(43,610)	(46,125)
Available for Sale, Fair Value	446,468	512,049
Held-to-Maturity, Amortized Cost	(256,742)	(267,204)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(18,761)	(14,101)
Investment Securities, Held to Maturity, Fair Value	237,981	253,103
Commercial CMO and MBS(1)
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	411,465	538,910
Available for Sale, Gross Unrealized Gains	113	88
Available for Sale, Gross Unrealized Losses	(32,810)	(34,740)
Available for Sale, Fair Value	378,768	504,258
Held-to-Maturity, Amortized Cost	(319,454)	(321,163)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(37,152)	(35,190)
Investment Securities, Held to Maturity, Fair Value	282,302	285,973
Corporate obligations
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	11,672	7,745
Available for Sale, Gross Unrealized Gains	9	2
Available for Sale, Gross Unrealized Losses	(297)	(134)
Available for Sale, Fair Value	11,384	7,613
Other asset-backed securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	12,369	17,336
Available for Sale, Gross Unrealized Gains	76	31
Available for Sale, Gross Unrealized Losses	(11)	(209)
Available for Sale, Fair Value	$ 12,434	$ 17,158

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, 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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