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Investment Securities and Equity Securities with Readily Determinable Fair Values (Contractual Maturities and Estimated Fair Values) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Held-to-maturity debt securities amortized cost disclosures
Due in one year or less, held-to-maturity debt securities amortized cost	$ 1,200,000		$ 1,200,000
Due after one year through five years, held-to-maturity debt securities amortized cost	1,200,000		1,200,000
Amortized cost, held-to-maturity debt securities	2,400,000		2,400,000		$ 2,400,000
Held-to-maturity debt securities, Estimated fair value disclosures
Due in one year or less, held-to-maturity debt securities, Estimated fair value	1,200,000		1,200,000
Due after one year through five years, held-to-maturity debt securities, Estimated fair value	1,200,000		1,200,000
Estimated fair value	2,400,000		2,400,000		2,400,000
Available-for-sale debt securities amortized cost disclosures
Due after five years through ten years, available-for-sale debt securities amortized cost	500,000		500,000
Due after ten years, available-for-sale debt securities amortized cost	186,064,000		186,064,000
Residential mortgage-backed securities, amortized cost	3,444,855,000		3,444,855,000
Amortized cost, Available-for-sale securities	3,631,419,000		3,631,419,000		4,196,263,000
Available for sale debt securities, Estimated Fair Value Disclosures
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value	506,000		506,000
Due after ten years, available-for-sale debt securities, Estimated Fair Value	188,663,000		188,663,000
Residential mortgage-backed securities, Estimated Fair Value	3,320,727,000		3,320,727,000
Estimated fair value, Available for sale securities	3,509,896,000		3,509,896,000		$ 4,124,185,000
Proceeds from sales and calls of available for sale securities	19,530,000	$ 7,235,000	37,675,000	$ 279,419,000
Proceeds from sales of mortgage-backed securities	0	0	0	266,967,000
Gross gains realized on sales	2,000	0	3,000	1,186,000
Gross losses realized on sales	0	$ 0	0	$ 2,798,000
Collateral Pledged
Available-for-sale debt securities amortized cost disclosures
Amortized cost, Available-for-sale securities	1,111,062,000		1,111,062,000
Available for sale debt securities, Estimated Fair Value Disclosures
Fair value of available for sale investment securities pledged	$ 1,068,227,000		$ 1,068,227,000

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