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v3.24.3

Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,433,097 | $ 1,332,467
Gross unrealized gains |  | 10,470 | 3,658
Gross unrealized losses |  | 35,130 | 39,831
Securities AFS, at estimated fair value |  | 1,408,437 | 1,296,294
HELD TO MATURITY |  |  |
Amortized cost |  | 1,288,403 | 1,307,053
Gross unrealized gains |  | 8,986 | 10,571
Gross unrealized losses |  | 127,866 | 151,462
Estimated Fair Value |  | 1,169,523 | 1,166,162
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 174,076 | 139,706
Gross unrealized gains |  | 91 | 19
Gross unrealized losses |  | 0 | 0
Securities AFS, at estimated fair value |  | 174,167 | 139,725
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 468,836 | 603,913
Gross unrealized gains |  | 135 | 362
Gross unrealized losses |  | 32,044 | 35,530
Securities AFS, at estimated fair value |  | 436,927 | 568,745
HELD TO MATURITY |  |  |
Amortized cost |  | 1,040,876 | 1,039,440
Gross unrealized gains |  | 8,810 | 10,070
Gross unrealized losses |  | 110,543 | 126,233
Estimated Fair Value |  | 939,143 | 923,277
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 14,626 | 14,569
Gross unrealized gains |  | 147 | 31
Gross unrealized losses |  | 414 | 507
Securities AFS, at estimated fair value |  | 14,359 | 14,093
HELD TO MATURITY |  |  |
Amortized cost |  | 131,456 | 146,712
Gross unrealized gains |  | 157 | 488
Gross unrealized losses |  | 10,387 | 15,738
Estimated Fair Value |  | 121,226 | 131,462
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 770,310 | 569,039
Gross unrealized gains | [1] | 10,016 | 3,202
Gross unrealized losses | [1] | 2,233 | 3,258
Securities AFS, at estimated fair value | [1] | 778,093 | 568,983
HELD TO MATURITY |  |  |
Amortized cost | [1] | 86,321 | 90,619
Gross unrealized gains | [1] | 19 | 13
Gross unrealized losses | [1] | 5,493 | 7,263
Estimated Fair Value | [1] | 80,847 | 83,369
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 5,249 | 5,240
Gross unrealized gains | [1] | 81 | 44
Gross unrealized losses | [1] | 439 | 536
Securities AFS, at estimated fair value | [1] | 4,891 | 4,748
HELD TO MATURITY |  |  |
Amortized cost | [1] | 29,750 | 30,282
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 1,443 | 2,228
Estimated Fair Value | [1] | $ 28,307 | $ 28,054
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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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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