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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
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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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