Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 3,705,857	$ 3,738,747
US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	994	1,000
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,649,045	1,659,722
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	871,331	885,476
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,972	43,693
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	320,057	324,182
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	770,177	772,456
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	51,281	52,219
Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	7,273	4,221
Not Rated [Member] | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Not Rated [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	7,273	4,221
Not Rated [Member] | Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Not Rated [Member] | Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Not Rated [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Not Rated [Member] | Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Not Rated [Member] | Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	2,818,388	2,846,177
Fitch, AAA Rating [Member] | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	994	1,000
Fitch, AAA Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	761,576	767,151
Fitch, AAA Rating [Member] | Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	871,331	885,476
Fitch, AAA Rating [Member] | Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,972	43,693
Fitch, AAA Rating [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	320,057	324,182
Fitch, AAA Rating [Member] | Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	770,177	772,456
Fitch, AAA Rating [Member] | Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	51,281	52,219
Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	876,276	883,438
Fitch, AA Rating [Member] | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AA Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	876,276	883,438
Fitch, AA Rating [Member] | Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AA Rating [Member] | Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AA Rating [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AA Rating [Member] | Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, AA Rating [Member] | Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,920	4,911
Fitch, A Rating [Member] | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member] | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,920	4,911
Fitch, A Rating [Member] | Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member] | Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member] | Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Fitch, A Rating [Member] | Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 0	$ 0