Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Available for Sale, Due in one year or less	$ 1,915
Available for Sale, Due after one year through five years	47,142
Available for Sale, Due after five years through ten years	50,863
Available for Sale, Due after ten years	26,888
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	126,808
Available for Sale, Total debt securities	3,902,762	$ 3,749,814
Fair Value
Available for Sale, Due in one year or less	1,902
Available for Sale, Due after one year through five years	42,470
Available for Sale, Due after five years through ten years	48,613
Available for Sale, Due after ten years	26,368
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	119,353
Available for Sale, Total debt securities	$ 3,724,148	3,600,892
Available for Sale, Ratio of Fair Value to Amortized Cost	95.40%
Amortized Cost
Held to Maturity, Due in one year or less	$ 11,061
Held to Maturity, Due after one year through five years	58,092
Held to Maturity, Due after five years through ten years	166,954
Held to Maturity, Due after ten years	1,441,167
Held to Maturity, Total Debt Securities	1,677,274
Held to Maturity, Amortized Cost	3,833,043	3,860,235
Fair Value
Held to Maturity, Due in one year or less	11,011
Held to Maturity, Due after one year through five years	57,522
Held to Maturity, Due after five years through ten years	162,309
Held to Maturity, Due after ten years	1,293,862
Held to Maturity, Securities, Debt Securities	1,524,703
Held to Maturity, Total debt securities at fair value	$ 3,301,284	3,380,624
Held to Maturity, Ratio of Fair Value to Amortized Cost	86.10%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Available for Sale, Total debt securities	$ 0
Fair Value
Available for Sale, Total debt securities	0
Amortized Cost
Held to Maturity, Amortized Cost	341,153	345,083
Fair Value
Held to Maturity, Total debt securities at fair value	281,069	289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	130,196	135,832
Fair Value
Available for Sale, Total debt securities	129,154	133,975
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	916	1,077
Fair Value
Available for Sale, Total debt securities	890	1,051
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
US Government Sponsored-Enterprise Insured Loans \| Residential Related Securities
Amortized Cost
Available for Sale, Total debt securities	1,247,657	1,274,052
Fair Value
Available for Sale, Total debt securities	1,090,998	1,120,794
Amortized Cost
Held to Maturity, Amortized Cost	930,148	941,973
Fair Value
Held to Maturity, Total debt securities at fair value	771,944	804,393
US Government Sponsored-Enterprise Insured Loans \| Commercial mortgage-related securities
Amortized Cost
Available for Sale, Total debt securities	18,603	18,691
Fair Value
Available for Sale, Total debt securities	17,008	16,937
Amortized Cost
Held to Maturity, Amortized Cost	779,310	780,995
Fair Value
Held to Maturity, Total debt securities at fair value	628,928	632,914
Government National Mortgage Association (GNMA) [Member] \| Residential Related Securities
Amortized Cost
Available for Sale, Total debt securities	2,219,058	2,021,242
Fair Value
Available for Sale, Total debt securities	2,214,513	2,042,675
Amortized Cost
Held to Maturity, Amortized Cost	48,043	48,979
Fair Value
Held to Maturity, Total debt securities at fair value	44,457	46,170
Government National Mortgage Association (GNMA) [Member] \| Commercial mortgage-related securities
Amortized Cost
Available for Sale, Total debt securities	159,523	161,928
Fair Value
Available for Sale, Total debt securities	152,232	154,793
Amortized Cost
Held to Maturity, Amortized Cost	57,114	59,733
Fair Value
Held to Maturity, Total debt securities at fair value	$ 50,183	$ 52,619

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