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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
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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

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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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