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Investment Securities and Equity Securities with Readily Determinable Fair Values (Contractual Maturities and Estimated Fair Values) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract]
Due in one year or less, held-to-maturity debt securities amortized cost	$ 1,200		$ 1,200
Due after one year through five years, held-to-maturity debt securities amortized cost	2,200		2,200
Amortized cost, held-to-maturity debt securities	3,400		3,400		$ 2,400
Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract]
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,200		1,200
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	2,200		2,200
Estimated fair value	3,400		3,400		2,400
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	355		355
Due after ten years, available-for-sale debt securities amortized cost	60,967		60,967
Residential mortgage-backed securities, amortized cost	3,196,279		3,196,279
Amortized cost, Available-for-sale securities	3,257,601		3,257,601		3,376,070
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	356		356
Due after ten years, available-for-sale debt securities, Estimated Fair Value	63,749		63,749
Residential mortgage-backed securities, Estimated Fair Value	3,234,735		3,234,735
Estimated fair value, Available for sale securities	3,298,840		3,298,840		$ 3,378,923
Available for sale debt securities, Estimated Fair Value Disclosures
Proceeds from sales and calls of available for sale securities	9,875	$ 32,285	28,795	$ 92,980
Proceeds from sales of mortgage-backed securities	0	0	0	0
Gross gains realized on sales	0	1	0	4
Gross losses realized on sales	0	$ 3	5	$ 16
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,116,960		1,116,960
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,131,366		$ 1,131,366

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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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