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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Amortized cost	$ 3,185,249	$ 2,344,174
Fair Value, Held-to-maturity	$ 1,921,693	$ 604,223
Common stock, par value	$ 0	$ 0
Common stock, authorized	225,000,000	225,000,000
Common stock, shares issued	135,526,025	135,600,501
Common stock, shares outstanding	135,526,025	135,600,501

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Face amount per share of no-par value common stock.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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