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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2024
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
|  | Unrealized Gain (Loss) on |  |  |  |  |  |
|  | Available for Sale Securities |  | Investment Securities Transferred from AFS |  |  |  |  |  | Total
Balance, Dec. 31, 2022 |  | $ | (664,618) |  |  | $ | (172,337) |  |  |  |  |  |  | (836,955) |
Net change in unrealized gain (loss) |  | 124,045 |  |  | — |  |  |  |  |  |  | 124,045 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 16,051 |  |  |  |  |  |  | 16,051 |
Other comprehensive income, before income taxes |  | 124,045 |  |  | 16,051 |  |  |  |  |  |  | 140,096 |
Federal and state income taxes |  | 28,179 |  |  | 3,516 |  |  |  |  |  |  | 31,695 |
Other comprehensive income, net of income taxes |  | 95,866 |  |  | 12,535 |  |  |  |  |  |  | 108,401 |
Balance, March 31, 2023 |  | $ | (568,752) |  |  | $ | (159,802) |  |  |  |  |  |  | $ | (728,554) |
Balance, Dec. 31, 2023 |  | $ | (473,212) |  |  | $ | (125,888) |  |  |  |  |  |  | $ | (599,100) |
Net change in unrealized gain (loss) |  | (71,806) |  |  | — |  |  |  |  |  |  | (71,806) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 12,183 |  |  |  |  |  |  | 12,183 |
Loss on available for sale securities, net |  | 45,171 |  |  | — |  |  |  |  |  |  | 45,171 |
Other comprehensive income (loss), before income taxes |  | (26,635) |  |  | 12,183 |  |  |  |  |  |  | (14,452) |
Federal and state income taxes |  | (6,289) |  |  | 2,865 |  |  |  |  |  |  | (3,424) |
Other comprehensive income (loss), net of income taxes |  | (20,346) |  |  | 9,318 |  |  |  |  |  |  | (11,028) |
Balance, March 31, 2024 |  | $ | (493,558) |  |  | $ | (116,570) |  |  |  |  |  |  | $ | (610,128) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
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