Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 6,411,899	$ 5,367,813
Debt Securities, Available-for-Sale	6,366,586	5,397,563
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(49,001)	(11,551)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	3,688	41,301
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,510,775	3,602,576
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	1,859	3,488
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(420,816)	(415,070)
Debt Securities, Held-to-Maturity, Fair Value	3,091,818	3,190,994
Equity securities	15,000	15,000
US Treasury Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	997	996
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	5	19
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-Maturity, Fair Value	1,002	1,015
US Treasury Securities | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	997	996
Debt Securities, Held-to-Maturity, Fair Value	1,002	1,015
US Treasury Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	7,342	3,063
Debt Securities, Available-for-Sale	7,240	3,044
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(106)	(20)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	4	1
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,591,681	1,628,088
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	1,797	3,070
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(124,874)	(123,856)
Debt Securities, Held-to-Maturity, Fair Value	1,468,604	1,507,302
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	7,240	3,044
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,591,681	1,628,088
Debt Securities, Held-to-Maturity, Fair Value	1,468,604	1,507,302
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	7,240	3,044
Debt Securities, Held-to-Maturity, Fair Value	1,468,604	1,507,302
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	0
Debt Securities, Available-for-Sale	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	292,007	302,817
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(45,547)	(43,990)
Debt Securities, Held-to-Maturity, Fair Value	246,460	258,827
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	89,197	95,977
Debt Securities, Available-for-Sale	88,212	95,046
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(986)	(950)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1	19
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	88,212	95,046
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	88,212	95,046
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	120,221	283
Debt Securities, Available-for-Sale	120,070	269
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(538)	(14)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	387	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	120,070	269
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	120,070	269
Other Debt securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	6,750	3,000
Debt Securities, Available-for-Sale	5,063	2,998
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(1,687)	(2)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	142,709	134,142
Debt Securities, Available-for-Sale	137,288	129,863
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(6,236)	(5,493)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	815	1,214
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	790,729	823,630
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	39	165
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(130,031)	(127,333)
Debt Securities, Held-to-Maturity, Fair Value	660,737	696,462
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	137,288	129,863
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	790,729	823,630
Debt Securities, Held-to-Maturity, Fair Value	660,737	696,462
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	137,288	129,863
Debt Securities, Held-to-Maturity, Fair Value	660,737	696,462
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	414,880	17,959
Debt Securities, Available-for-Sale	410,221	16,958
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(4,659)	(1,001)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	757,723	763,370
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(113,423)	(113,004)
Debt Securities, Held-to-Maturity, Fair Value	644,300	650,366
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	410,221	16,958
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	757,723	763,370
Debt Securities, Held-to-Maturity, Fair Value	644,300	650,366
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	410,221	16,958
Debt Securities, Held-to-Maturity, Fair Value	644,300	650,366
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	5,518,890	5,000,015
Debt Securities, Available-for-Sale	5,491,648	5,039,829
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(29,723)	(253)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	2,481	40,067
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,215	39,123
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	18	82
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(2,607)	(2,321)
Debt Securities, Held-to-Maturity, Fair Value	34,626	36,884
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	5,491,648	5,039,829
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,215	39,123
Debt Securities, Held-to-Maturity, Fair Value	34,626	36,884
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	5,491,648	5,039,829
Debt Securities, Held-to-Maturity, Fair Value	34,626	36,884
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	111,910	113,374
Debt Securities, Available-for-Sale	106,844	109,556
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(5,066)	(3,818)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	40,423	44,552
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	152
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(4,334)	(4,566)
Debt Securities, Held-to-Maturity, Fair Value	36,089	40,138
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	106,844	109,556
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	40,423	44,552
Debt Securities, Held-to-Maturity, Fair Value	36,089	40,138
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	106,844	109,556
Debt Securities, Held-to-Maturity, Fair Value	$ 36,089	$ 40,138