Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 2,395
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	42,606
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	64,728
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	27,263
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	136,992
Debt Securities, Available-for-Sale, Amortized Cost, Total	3,749,814	$ 2,997,032
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	2,372
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	38,464
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	62,839
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	26,993
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	130,669
Total debt securities, AFS Fair Value	$ 3,600,892	2,742,025
Ratio of Fair Value to Amortized Cost, AFS	96.00%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 6,099
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	52,391
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	157,279
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,467,704
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,683,472
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,860,235	3,960,451
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	6,096
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	52,328
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	153,795
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,342,803
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,555,022
Debt Securities, Held-to-maturity, Fair Value	$ 3,380,624	3,401,018
Ratio of Fair Value to Amortized Cost, HTM	87.60%
Residential Related Securities | FNMA/FHLMC [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 1,274,052	1,820,642
Fair Value
Total debt securities, AFS Fair Value	1,120,794	1,604,610
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	941,973	961,231
Fair Value
Debt Securities, Held-to-maturity, Fair Value	804,393	816,771
Residential Related Securities | Government National Mortgage Association (GNMA)
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	2,021,242	502,537
Fair Value
Total debt securities, AFS Fair Value	2,042,675	497,596
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	48,979	52,979
Fair Value
Debt Securities, Held-to-maturity, Fair Value	46,170	49,628
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	0
Fair Value
Total debt securities, AFS Fair Value	0
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	345,083	364,728
Fair Value
Debt Securities, Held-to-maturity, Fair Value	289,507	303,505
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	18,691	19,038
Fair Value
Total debt securities, AFS Fair Value	16,937	17,142
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	780,995	778,796
Fair Value
Debt Securities, Held-to-maturity, Fair Value	632,914	615,839
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	161,928	115,031
Fair Value
Total debt securities, AFS Fair Value	154,793	110,462
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	59,733	69,369
Fair Value
Debt Securities, Held-to-maturity, Fair Value	52,619	62,691
FFELP asset backed securities
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	135,832	157,138
Fair Value
Total debt securities, AFS Fair Value	133,975	151,191
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	1,077	4,512
Fair Value
Total debt securities, AFS Fair Value	1,051	$ 4,477
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	$ 0