Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 3,860,235	$ 3,960,451
Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,155	1,158
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	2,938,090	3,034,630
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	915,303	917,059
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	5,687	7,604
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999	999
US Treasury Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US Treasury Securities [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999	999
US Treasury Securities [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US Treasury Securities [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,682,473	1,732,351
US States and Political Subdivisions Debt Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,155	1,158
US States and Political Subdivisions Debt Securities [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	760,329	806,529
US States and Political Subdivisions Debt Securities [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	915,303	917,059
US States and Political Subdivisions Debt Securities [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	5,687	7,604
Residential Related Securities | FNMA/FHLMC [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	941,973	961,231
Residential Related Securities | FNMA/FHLMC [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | FNMA/FHLMC [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	941,973	961,231
Residential Related Securities | FNMA/FHLMC [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | FNMA/FHLMC [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	48,979	52,979
Residential Related Securities | Government National Mortgage Association (GNMA) | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA) | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	48,979	52,979
Residential Related Securities | Government National Mortgage Association (GNMA) | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA) | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	345,083	364,728
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	345,083	364,728
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	780,995	778,796
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	780,995	778,796
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	59,733	69,369
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	59,733	69,369
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 0	$ 0