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v3.23.1

Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,499,135 | $ 1,387,874
Gross unrealized gains |  | 2,511 | 1,282
Gross unrealized losses |  | 64,424 | 90,142
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) |  | 1,437,222 | 1,299,014
HELD TO MATURITY |  |  |
Amortized cost |  | 1,308,457 | 1,326,729
Gross unrealized gains |  | 9,288 | 4,565
Gross unrealized losses |  | 145,171 | 182,138
Estimated Fair Value |  | 1,172,574 | 1,149,156
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 297,061 |
Gross unrealized gains |  | 96 |
Gross unrealized losses |  | 0 |
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) |  | 297,157 |
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 938,822 | 1,039,453
Gross unrealized gains |  | 2,023 | 956
Gross unrealized losses |  | 54,373 | 75,557
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) |  | 886,472 | 964,852
HELD TO MATURITY |  |  |
Amortized cost |  | 1,038,054 | 1,037,556
Gross unrealized gains |  | 8,703 | 3,969
Gross unrealized losses |  | 126,946 | 163,283
Estimated Fair Value |  | 919,811 | 878,242
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 14,513 | 8,692
Gross unrealized gains |  | 33 | 26
Gross unrealized losses |  | 1,135 | 14
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) |  | 13,411 | 8,704
HELD TO MATURITY |  |  |
Amortized cost |  | 146,203 | 152,552
Gross unrealized gains |  | 561 | 575
Gross unrealized losses |  | 9,821 | 7,993
Estimated Fair Value |  | 136,943 | 145,134
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 237,426 | 328,400
Gross unrealized gains | [1] | 302 | 250
Gross unrealized losses | [1] | 7,992 | 13,623
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) | [1] | 229,736 | 315,027
HELD TO MATURITY |  |  |
Amortized cost | [1] | 93,399 | 93,796
Gross unrealized gains | [1] | 24 | 21
Gross unrealized losses | [1] | 6,282 | 8,343
Estimated Fair Value | [1] | 87,141 | 85,474
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 11,313 | 11,329
Gross unrealized gains | [1] | 57 | 50
Gross unrealized losses | [1] | 924 | 948
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively) | [1] | 10,446 | 10,431
HELD TO MATURITY |  |  |
Amortized cost | [1] | 30,801 | 42,825
Gross unrealized gains | [1] | 0 | 0
Gross unrealized losses | [1] | 2,122 | 2,519
Estimated Fair Value | [1] | $ 28,679 | $ 40,306
[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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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