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Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for Sale Securities, Amortized Cost
Within one year	$ 308,474
After one through five years	71,518
Total, single maturity date	379,992
Total	1,116,954	$ 337,387
Available for Sale Securities, Fair Value
Within one year	305,406
After one through five years	71,317
Total, single maturity date	376,723
Total	1,113,687	323,337
Held to Maturity Securities, Amortized Cost
Total	1,204,217	1,119,078
Held to Maturity Securities, Fair Value
Total	1,203,535	1,118,966
Mortgage-backed - Agency
Available for Sale Securities, Amortized Cost
Total		15,167
Available for Sale Securities, Fair Value
Total		15,167
Held to Maturity Securities, Amortized Cost
Total	12,016
Held to Maturity Securities, Fair Value
Total	11,194
Mortgage-backed - Government Agency ("Agency")
Available for Sale Securities, Amortized Cost
Without single maturity date	14,465
Total	14,465
Available for Sale Securities, Fair Value
Without single maturity date	14,467
Total	14,467
Mortgage-backed - Agency - fair value option
Available for Sale Securities, Amortized Cost
Without single maturity date	236,997
Total	236,997
Available for Sale Securities, Fair Value
Without single maturity date	236,997
Total	236,997
Mortgage-backed - Non-Agency multi-family
Held to Maturity Securities, Amortized Cost
Total	719,662	871,772
Held to Maturity Securities, Fair Value
Total	719,247	871,784
Mortgage-backed - Non-Agency residential
Available for Sale Securities, Amortized Cost
Without single maturity date	485,500
Total	485,500
Available for Sale Securities, Fair Value
Without single maturity date	485,500
Total	485,500
Held to Maturity Securities, Amortized Cost
Total	472,539	247,306
Held to Maturity Securities, Fair Value
Total	$ 473,094	$ 247,182

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