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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, 2023	Dec. 31, 2022
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	$ 1,292,500	$ 1,460,033
Available for Sale, Gross Unrealized Gains	74	205
Available for Sale, Gross Unrealized Losses	(145,027)	(128,795)
Available for Sale, Fair Value	1,147,547	1,331,443
Held-to-Maturity, Amortized Cost	(746,845)	(766,396)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(110,588)	(92,962)
Held to Maturity, Fair Value	636,257	673,434
U.S. government and agency securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	23,533	68,912
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	(3,109)	(5,053)
Available for Sale, Fair Value	20,424	63,859
Held-to-Maturity, Amortized Cost	(151,040)	(150,936)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(35,221)	(33,585)
Held to Maturity, Fair Value	115,819	117,351
Municipal securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	126,763	171,087
Available for Sale, Gross Unrealized Gains	7	172
Available for Sale, Gross Unrealized Losses	(19,965)	(18,233)
Available for Sale, Fair Value	106,805	153,026
Residential CMO and MBS
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	468,174	479,473
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	(66,993)	(55,087)
Available for Sale, Fair Value	401,181	424,386
Held-to-Maturity, Amortized Cost	(273,609)	(290,318)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(27,445)	(17,440)
Held to Maturity, Fair Value	246,164	272,878
Commercial CMO and MBS
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	651,713	714,136
Available for Sale, Gross Unrealized Gains	5	19
Available for Sale, Gross Unrealized Losses	(54,505)	(49,734)
Available for Sale, Fair Value	597,213	664,421
Held-to-Maturity, Amortized Cost	(322,196)	(325,142)
Held to Maturity, Gross Unrecognized Gains	0	0
Held to Maturity, Gross Unrecognized Losses	(47,922)	(41,937)
Held to Maturity, Fair Value	274,274	283,205
Corporate obligations
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	4,000	4,000
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	(220)	(166)
Available for Sale, Fair Value	3,780	3,834
Other asset-backed securities
Investment Securities Holdings by Classification, Type, and Maturity [Line Items]
Available for Sale, Amortized Cost	18,317	22,425
Available for Sale, Gross Unrealized Gains	62	14
Available for Sale, Gross Unrealized Losses	(235)	(522)
Available for Sale, Fair Value	$ 18,144	$ 21,917

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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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