Schedule of Temporary Impairment Losses, Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 894,437	$ 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14,081)	(10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	894,437	3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(14,081)	(10)
Debt Securities, Held-to-maturity	548,057	361,844
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	5,243	8,017
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,957)	(10)
Securities held to maturity, fair value	547,343	369,851
US Government Agencies Debt Securities Commercial
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	213,203
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,281)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	213,203
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,281)
Residential Mortgage Backed Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	640,235	3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(10,850)	(10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	640,235	3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(10,850)	(10)
Debt Securities, Held-to-maturity	387,399	277,351
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	3,832	5,389
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4,303)	(10)
Securities held to maturity, fair value	386,928	282,730
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	22,090
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(735)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	22,090
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(735)
Debt Securities, Held-to-maturity	21,825	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(726)	0
Securities held to maturity, fair value	21,099	0
Obligations of States and Political Subdivisions [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13,798
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(175)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	13,798
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(175)
Debt Securities, Held-to-maturity	31,246	34,391
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	461	705
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(94)	0
Securities held to maturity, fair value	31,613	35,096
Corporate Debt Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,111
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(40)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total	5,111
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss	(40)
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]
Debt Securities, Held-to-maturity	7,927	9,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	235	344
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Securities held to maturity, fair value	$ 8,162	$ 10,081