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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | $ 2,434,389 | $ 2,049,302
Available for sale, gross unrealized gains | 3,492 | 4,432
Available for sale, gross unrealized losses | (211,338) | (217,714)
Debt securities available-for-sale | 2,226,543 | 1,836,020
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 635,186 | 680,313
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (127,592) | (121,954)
Held to maturity, fair value | 507,594 | 558,359
U.S. Treasury securities and obligations of U.S. government agencies |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 28,233 | 37,718
Available for sale, gross unrealized gains | 29 | 205
Available for sale, gross unrealized losses | (522) | (478)
Debt securities available-for-sale | 27,740 | 37,445
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 1,777,274 | 1,152,753
Available for sale, gross unrealized gains | 1,237 | 780
Available for sale, gross unrealized losses | (190,536) | (184,152)
Debt securities available-for-sale | 1,587,975 | 969,381
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 546,444 | 590,676
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (117,620) | (111,746)
Held to maturity, fair value | 428,824 | 478,930
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 206,537 | 385,013
Available for sale, gross unrealized gains | 1,195 | 2,824
Available for sale, gross unrealized losses | (10,283) | (19,565)
Debt securities available-for-sale | 197,449 | 368,272
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 88,742 | 89,637
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (9,972) | (10,208)
Held to maturity, fair value | 78,770 | 79,429
Private mortgage-backed securities and collateralized mortgage obligations |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 129,475 | 135,878
Available for sale, gross unrealized gains | 149 | 36
Available for sale, gross unrealized losses | (8,382) | (10,911)
Debt securities available-for-sale | 121,242 | 125,003
Collateralized loan obligations |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 278,342 | 300,855
Available for sale, gross unrealized gains | 788 | 11
Available for sale, gross unrealized losses | (166) | (1,411)
Debt securities available-for-sale | 278,964 | 299,455
Obligations of state and political subdivisions |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 7,139 | 10,486
Available for sale, gross unrealized gains | 0 | 0
Available for sale, gross unrealized losses | (1,449) | (1,096)
Debt securities available-for-sale | 5,690 | 9,390
Other Debt Securities |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 7,389 | 26,599
Available for sale, gross unrealized gains | 94 | 576
Available for sale, gross unrealized losses | 0 | (101)
Debt securities available-for-sale | $ 7,483 | $ 27,074

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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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