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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Amortized Cost
Due in one year or less, held-to-maturity debt securities amortized cost	$ 2,325,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,075,000
Amortized cost, held-to-maturity debt securities	3,400,000		$ 3,400,000
Fair Value
Due in one year or less, held-to-maturity debt securities, Estimated fair value	2,325,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,075,000
Estimated fair value	3,400,000		3,400,000
Available-for-sale debt securities amortized cost disclosures
Due after one year through five years, available-for-sale debt securities amortized cost	49,099,000
Due after ten years, available-for-sale debt securities amortized cost	41,454,000
Residential mortgage-backed securities, amortized cost	4,313,749,000
Amortized cost, Available-for-sale securities	4,404,302,000		4,254,960,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after one year through five years, available-for-sale debt securities, Estimated Fair Value	49,099,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	42,545,000
Residential mortgage-backed securities, Estimated Fair Value	4,050,353,000
Estimated fair value, Available for sale securities	4,141,997,000		$ 4,213,920,000
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	0	$ 2,510,000
Proceeds from sales of mortgage-backed securities	0	0
Gross gains realized on sales	0	0
Gross losses realized on sales	0	$ (4)
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,517,343,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,405,511,000

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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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