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Investment Securities Available for Sale (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) securities	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items]
Securities in a loss position for less than twelve months | securities	22
Investment securities in a loss position for twelve months or longer | securities	0
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 78,931	$ (7,659)	$ (1,296)
Debt Securities, Available-for-sale, Realized Loss	6,444	18,029	$ 1,296
12 Months or Longer, Fair Value	0	5,309
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Pledged to secure deposits	$ 3,840,000	$ 1,710,000

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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-Publisher FASB
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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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Amount of realized gain (loss) on 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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Amount of restricted 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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