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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	Sep. 30, 2024	Dec. 31, 2023
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	$ 909,023	$ 1,227,787
Available for Sale, Gross Unrealized Gains	2,947	2,786
Available for Sale, Gross Unrealized Losses	(59,191)	(96,220)
Available for Sale, Fair Value	852,779	1,134,353
Held-to-Maturity, Amortized Cost	(719,400)	(739,442)
Held to Maturity, Gross Unrecognized Gains	345	0
Held to Maturity, Gross Unrecognized Losses	(58,049)	(76,992)
Investment Securities, Held to Maturity, Fair Value	661,696	662,450
U.S. government and agency securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	14,939	16,047
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	(1,885)	(2,297)
Available for Sale, Fair Value	13,054	13,750
Held-to-Maturity, Amortized Cost	(151,181)	(151,075)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(23,108)	(27,701)
Investment Securities, Held to Maturity, Fair Value	128,073	123,374
Municipal securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	70,210	92,231
Available for Sale, Gross Unrealized Gains	9	9
Available for Sale, Gross Unrealized Losses	(8,956)	(12,715)
Available for Sale, Fair Value	61,263	79,525
Residential CMO and MBS(1)
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	455,633	555,518
Available for Sale, Gross Unrealized Gains	2,560	2,656
Available for Sale, Gross Unrealized Losses	(31,145)	(46,125)
Available for Sale, Fair Value	427,048	512,049
Held-to-Maturity, Amortized Cost	(249,589)	(267,204)
Held to Maturity, Gross Unrecognized Gains	333	0
Held to Maturity, Gross Unrecognized Losses	(9,056)	(14,101)
Investment Securities, Held to Maturity, Fair Value	240,866	253,103
Commercial CMO and MBS(1)
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	345,751	538,910
Available for Sale, Gross Unrealized Gains	205	88
Available for Sale, Gross Unrealized Losses	(17,095)	(34,740)
Available for Sale, Fair Value	328,861	504,258
Held-to-Maturity, Amortized Cost	(318,630)	(321,163)
Held to Maturity, Gross Unrecognized Gains	12	0
Held to Maturity, Gross Unrecognized Losses	(25,885)	(35,190)
Investment Securities, Held to Maturity, Fair Value	292,757	285,973
Corporate obligations
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	11,686	7,745
Available for Sale, Gross Unrealized Gains	122	2
Available for Sale, Gross Unrealized Losses	(102)	(134)
Available for Sale, Fair Value	11,706	7,613
Other asset-backed securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	10,804	17,336
Available for Sale, Gross Unrealized Gains	51	31
Available for Sale, Gross Unrealized Losses	(8)	(209)
Available for Sale, Fair Value	$ 10,847	$ 17,158

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- Definition

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 of accumulated unrecognized gain 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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