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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Held-to-maturity debt securities amortized cost disclosures
Due in one year or less, held-to-maturity debt securities amortized cost	$ 1,075		$ 1,075
Due after one year through five years, held-to-maturity debt securities amortized cost	1,325		1,325
Amortized cost, held-to-maturity debt securities	2,400		2,400		$ 1,200
Held-to-maturity debt securities, Estimated fair value disclosures
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,075		1,075
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,325		1,325
Estimated fair value	2,400		2,400		1,200
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	2,244		2,244
Due after ten years, available-for-sale debt securities amortized cost	122,402		122,402
Residential mortgage-backed securities, amortized cost	3,348,834		3,348,834
Amortized cost, Available-for-sale securities	3,473,480		3,473,480		3,481,165
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	2,283		2,283
Due after ten years, available-for-sale debt securities, Estimated Fair Value	125,410		125,410
Residential mortgage-backed securities, Estimated Fair Value	3,340,220		3,340,220
Estimated fair value, Available for sale securities	3,467,913		3,467,913		$ 3,411,350
Proceeds from sales and calls of available for sale securities	19,275	$ 0	60,695	$ 18,145
Proceeds from sales of mortgage-backed securities	0	0	0	0
Gross gains realized on sales	1	0	3	0
Gross losses realized on sales	7	$ 0	13	$ 0
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,063,745		1,063,745
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,057,009		$ 1,057,009

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