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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | $ 2,799,759 | $ 2,434,389
Available for sale, gross unrealized gains | 11,729 | 3,492
Available for sale, gross unrealized losses | (183,529) | (211,338)
Available for sale, fair value | 2,627,959 | 2,226,543
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 624,650 | 635,186
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (114,899) | (127,592)
Held to maturity, fair value | 509,751 | 507,594
U.S. Treasury securities and obligations of U.S. government agencies |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 26,631 | 28,233
Available for sale, gross unrealized gains | 214 | 29
Available for sale, gross unrealized losses | (422) | (522)
Available for sale, fair value | 26,423 | 27,740
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 | 2,119,865 | 1,777,274
Available for sale, gross unrealized gains | 8,158 | 1,237
Available for sale, gross unrealized losses | (165,805) | (190,536)
Available for sale, fair value | 1,962,218 | 1,587,975
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 536,529 | 546,444
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (106,635) | (117,620)
Held to maturity, fair value | 429,894 | 428,824
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 | 249,246 | 206,537
Available for sale, gross unrealized gains | 2,500 | 1,195
Available for sale, gross unrealized losses | (8,110) | (10,283)
Available for sale, fair value | 243,636 | 197,449
Held-to-Maturity Debt Securities |  |
Held to maturity, amortized cost, total | 88,121 | 88,742
Held to maturity, gross unrealized gains | 0 | 0
Held to maturity, gross unrealized losses | (8,264) | (9,972)
Held to maturity, fair value | 79,857 | 78,770
Private mortgage-backed securities and collateralized mortgage obligations |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 124,038 | 129,475
Available for sale, gross unrealized gains | 210 | 149
Available for sale, gross unrealized losses | (7,041) | (8,382)
Available for sale, fair value | 117,207 | 121,242
Collateralized loan obligations |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 265,450 | 278,342
Available for sale, gross unrealized gains | 568 | 788
Available for sale, gross unrealized losses | (639) | (166)
Available for sale, fair value | 265,379 | 278,964
Obligations of state and political subdivisions |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 7,140 | 7,139
Available for sale, gross unrealized gains | 0 | 0
Available for sale, gross unrealized losses | (1,512) | (1,449)
Available for sale, fair value | 5,628 | 5,690
Other debt securities |  |
Available-for-Sale Debt Securities |  |
Available for sale, amortized cost, total | 7,389 | 7,389
Available for sale, gross unrealized gains | 79 | 94
Available for sale, gross unrealized losses | 0 | 0
Available for sale, fair value | $ 7,468 | $ 7,483

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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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