Investment Securities, Gross Unrealized Losses for Held-to-Maturity Securities (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		$ 629,096
12 months or more, fair value		0
Fair value		629,096
Less than 12 months, unrealized losses		11,993
12 months or more, unrealized losses		0
Unrealized losses		11,993	$ 0
Mortgage-backed Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	[1]	570,119
12 months or more, fair value	[1]	0
Fair value	[1]	570,119
Less than 12 months, unrealized losses	[1]	11,764
12 months or more, unrealized losses	[1]	0
Unrealized losses	[1]	11,764
Collateralized Mortgage Obligations [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		58,977
12 months or more, fair value		0
Fair value		58,977
Less than 12 months, unrealized losses		229
12 months or more, unrealized losses		0
Unrealized losses		$ 229

[1] All mortgage-backed securities were issued by an agency or government sponsored entity of the U.S. Government.