Investment Securities - Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized cost
Due in one year or less	$ 4,277	$ 21,851
Due in one to five years	161,556	54,847
Due in five to ten years	61,290	45,714
Due in over ten years	234,720	255,077
Amortized cost, sub-total	461,843	377,489
Total debt securities	1,705,574	1,673,798
Fair value
Due in one year or less	4,225	21,884
Due in one to five years	152,181	55,307
Due in five to ten years	57,859	46,975
Due in over ten years	205,084	269,737
Fair value, sub-total	419,349	393,903
Total debt securities	1,471,186	1,678,525
Mortgage-backed securities - residential
Amortized cost
Mortgage-backed securities	1,224,522	1,281,285
Total debt securities	1,224,522	1,281,285
Fair value
Mortgage-backed securities	1,034,193	1,269,372
Total debt securities	1,034,193	1,269,372
Mortgage-backed securities - commercial
Amortized cost
Mortgage-backed securities	19,209	15,024
Total debt securities	19,209	15,024
Fair value
Mortgage-backed securities	17,644	15,250
Total debt securities	$ 17,644	$ 15,250