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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Amortized Cost
Due in one year or less, held-to-maturity debt securities amortized cost	$ 2,075,000		$ 2,075,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,325,000		1,325,000
Amortized cost, held-to-maturity debt securities	3,400,000		3,400,000		$ 3,400,000
Fair Value
Due in one year or less, held-to-maturity debt securities, Estimated fair value	2,075,000		2,075,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,325,000		1,325,000
Estimated fair value	3,400,000		3,400,000		3,400,000
Available-for-sale debt securities amortized cost disclosures
Due after ten years, available-for-sale debt securities amortized cost	44,684,000		44,684,000
Residential mortgage-backed securities, amortized cost	4,103,989,000		4,103,989,000
Amortized cost, Available-for-sale securities	4,148,673,000		4,148,673,000		3,054,289,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after ten years, available-for-sale debt securities, Estimated Fair Value	48,245,000		48,245,000
Residential mortgage-backed securities, Estimated Fair Value	4,123,636,000		4,123,636,000
Estimated fair value, Available for sale securities	4,171,881,000		4,171,881,000		$ 3,080,768,000
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	355,000	$ 0	2,865,000	$ 18,920,000
Proceeds from sales of mortgage-backed securities	0	0	0	0
Gross gains realized on sales	0	0	0	0
Gross losses realized on sales	0	$ 0	(4,000)	$ (5,000)
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,372,241,000		1,372,241,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,372,942,000		$ 1,372,942,000

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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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