Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available for Sale Securities, Amortized Cost
Within one year	$ 189,067	$ 308,474
After one through five years	140,000	71,518
Total, single maturity date	329,067	379,992
Total	1,017,689	1,116,954
Available for Sale Securities, Fair Value
Within one year	188,522	305,406
After one through five years	139,875	71,317
Total, single maturity date	328,397	376,723
Total	1,017,019	1,113,687	[1]
Held to Maturity Securities, Amortized Cost
Amortized Cost	1,291,110	1,204,217	[1]
Held to Maturity Securities, Fair Value
Fair Value	1,291,960	1,203,535
Mortgage-backed - Agency
Available for Sale Securities, Amortized Cost
Without single maturity date	5,848	14,465
Available for Sale Securities, Fair Value
Without single maturity date	5,848	14,467
Held to Maturity Securities, Amortized Cost
Amortized Cost	11,936	12,016
Held to Maturity Securities, Fair Value
Fair Value	10,994	11,194
Mortgage-backed - Government Agency ("Agency")
Available for Sale Securities, Amortized Cost
Total	5,848	14,465
Available for Sale Securities, Fair Value
Total	5,848	14,467
Mortgage-backed - Agency - fair value option
Available for Sale Securities, Amortized Cost
Without single maturity date	220,147	236,997
Total	220,147	236,997
Available for Sale Securities, Fair Value
Without single maturity date	220,147	236,997
Total	220,147	236,997
Mortgage-backed - Non-Agency multi-family
Held to Maturity Securities, Amortized Cost
Amortized Cost	689,249	719,662
Held to Maturity Securities, Fair Value
Fair Value	688,725	719,247
Mortgage-backed - Non-Agency residential
Available for Sale Securities, Amortized Cost
Without single maturity date	462,627	485,500
Total	462,627	485,500
Available for Sale Securities, Fair Value
Without single maturity date	462,627	485,500
Total	462,627	485,500
Held to Maturity Securities, Amortized Cost
Amortized Cost	589,925	472,539
Held to Maturity Securities, Fair Value
Fair Value	$ 592,241	$ 473,094

[1] *Derived from audited consolidated financial statements