Investment Securities, Gross Unrealized Losses for Held-to-Maturity Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		$ 484,109	$ 629,096
12 months or more, fair value		212,758	0
Fair value		696,867	629,096
Less than 12 months, unrealized losses		66,706	11,993
12 months or more, unrealized losses		46,876	0
Unrealized losses		113,582	11,993
Municipal Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value		6,862
12 months or more, fair value		0
Fair value		6,862
Less than 12 months, unrealized losses		151
12 months or more, unrealized losses		0
Unrealized losses		151
Mortgage-backed Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	[1]	404,026	570,119
12 months or more, fair value	[1]	212,758	0
Fair value	[1]	616,784	570,119
Less than 12 months, unrealized losses	[1]	57,850	11,764
12 months or more, unrealized losses	[1]	46,876	0
Unrealized losses	[1]	104,726	11,764
Collateralized Mortgage Obligations [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	[1]	73,221	58,977
12 months or more, fair value	[1]	0	0
Fair value	[1]	73,221	58,977
Less than 12 months, unrealized losses	[1]	8,705	229
12 months or more, unrealized losses	[1]	0	0
Unrealized losses	[1]	$ 8,705	$ 229

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