Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for Sale Securities, Amortized Cost
Within one year	$ 118,984
After one through five years	203,236
Total, single maturity date	322,220
Total	337,387	$ 312,590
Available for Sale Securities, Fair Value
Within one year	115,386
After one through five years	192,784
Total, single maturity date	308,170
Total	323,337	310,629
Held to Maturity Securities, Amortized Cost
Total	1,119,078
Held to Maturity Securities, Fair Value
Total	1,118,966	0
Held to maturity securities:
Amortized Cost	1,119,078
Fair Value	1,118,966	0
Mortgage-backed - Government-sponsored entity (GSE)
Available for Sale Securities, Amortized Cost
Without single maturity date	15,167
Total	15,167	18,664
Available for Sale Securities, Fair Value
Without single maturity date	15,167
Total	15,167	18,360
Mortgage-backed - Non-GSE
Available for Sale Securities, Amortized Cost
Total		16,424
Available for Sale Securities, Fair Value
Total		$ 16,465
Mortgage-backed - Non-GSE residential
Held to Maturity Securities, Amortized Cost
Total	247,306
Held to Maturity Securities, Fair Value
Total	247,182
Held to maturity securities:
Amortized Cost	247,306
Fair Value	$ 247,182