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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2025
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 AFSTotal
Balance, Dec. 31, 2023$(473,212)$(125,888)$(599,100)
Net change in unrealized gain (loss)
263,436 — 263,436 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 35,641 35,641 
Loss on available-for-sale securities, net
45,828 — 45,828 
Other comprehensive income (loss), before income taxes309,264 35,641 344,905 
Federal and state income taxes72,711 8,383 81,094 
Other comprehensive income (loss), net of income taxes236,553 27,258 263,811 
Balance, September 30, 2024$(236,659)$(98,630)$(335,289)
Balance, Dec. 31, 2024$(412,348)$(90,692)$(503,040)
Net change in unrealized gain (loss)
333,866 — 333,866 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 27,280 27,280 
Gain on available-for-sale securities, net(213)— (213)
Other comprehensive income (loss), before income taxes333,653 27,280 360,933 
Federal and state income taxes78,244 6,313 84,557 
Other comprehensive income (loss), net of income taxes255,409 20,967 276,376 
Balance, September 30, 2025$(156,939)$(69,725)$(226,664)