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v3.23.3

Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,472,520 | $ 1,387,874
Gross unrealized gains |  | 373 | 1,282
Gross unrealized losses |  | 137,333 | 90,142
Securities AFS, at estimated fair value |  | 1,335,560 | 1,299,014
HELD TO MATURITY |  |  |
Amortized cost |  | 1,307,886 | 1,326,729
Gross unrealized gains |  | 314 | 4,565
Gross unrealized losses |  | 255,770 | 182,138
Estimated Fair Value |  | 1,052,430 | 1,149,156
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 224,174 |
Gross unrealized gains |  | 35 |
Gross unrealized losses |  | 0 |
Securities AFS, at estimated fair value |  | 224,209 |
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 822,753 | 1,039,453
Gross unrealized gains |  | 14 | 956
Gross unrealized losses |  | 114,224 | 75,557
Securities AFS, at estimated fair value |  | 708,543 | 964,852
HELD TO MATURITY |  |  |
Amortized cost |  | 1,038,934 | 1,037,556
Gross unrealized gains |  | 0 | 3,969
Gross unrealized losses |  | 225,921 | 163,283
Estimated Fair Value |  | 813,013 | 878,242
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 14,550 | 8,692
Gross unrealized gains |  | 19 | 26
Gross unrealized losses |  | 1,173 | 14
Securities AFS, at estimated fair value |  | 13,396 | 8,704
HELD TO MATURITY |  |  |
Amortized cost |  | 146,540 | 152,552
Gross unrealized gains |  | 313 | 575
Gross unrealized losses |  | 15,280 | 7,993
Estimated Fair Value |  | 131,573 | 145,134
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 399,943 | 328,400
Gross unrealized gains | [1] | 305 | 250
Gross unrealized losses | [1] | 20,861 | 13,623
Securities AFS, at estimated fair value | [1] | 379,387 | 315,027
HELD TO MATURITY |  |  |
Amortized cost | [1] | 91,954 | 93,796
Gross unrealized gains | [1] | 1 | 21
Gross unrealized losses | [1] | 11,305 | 8,343
Estimated Fair Value | [1] | 80,650 | 85,474
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 11,100 | 11,329
Gross unrealized gains | [1] | 0 | 50
Gross unrealized losses | [1] | 1,075 | 948
Securities AFS, at estimated fair value | [1] | 10,025 | 10,431
HELD TO MATURITY |  |  |
Amortized cost | [1] | 30,458 | 42,825
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 3,264 | 2,519
Estimated Fair Value | [1] | $ 27,194 | $ 40,306
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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