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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Summary of Components of Other Comprehensive Income | The tables below provide a summary of the components of OCI for the periods presented.
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | Before-tax |  |  | Tax effect |  |  | After-tax |  |  | Before-tax |  |  | Tax effect |  |  | After-tax |  |  | Before-tax |  |  | Tax effect |  |  | After-tax |
|  | (Dollars in thousands) |
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  | $ | (498,759 | ) |  | $ | 147,451 |  |  | $ | (351,308 | ) |  | $ | (56,075 | ) |  | $ | 16,578 |  |  | $ | (39,497 | ) |  | $ | 32,849 |  |  | $ | (9,711 | ) |  | $ | 23,138 |
Amortization of unrealized losses (gains) on securities transferred from available-for-sale to held-to-maturity |  |  | 681 |  |  |  | (201 | ) |  |  | 480 |  |  |  | 256 |  |  |  | (76 | ) |  |  | 180 |  |  |  | (572 | ) |  |  | 169 |  |  |  | (403 | )
Net realized gain reclassified into earnings (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | (498,078 | ) |  | $ | 147,250 |  |  | $ | (350,828 | ) |  | $ | (55,819 | ) |  | $ | 16,502 |  |  | $ | (39,317 | ) |  | $ | 32,277 |  |  | $ | (9,542 | ) |  | $ | 22,735 |
(1) Included in other noninterest income.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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