AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands	Dec. 31, 2021 USD ($) loan
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	236,825
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Total Unrealized Losses	$ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| loan	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| loan	40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| loan	40
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	9,674
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Total Unrealized Losses	88
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	11,165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Total Unrealized Losses	10
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	2,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	209,703
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Total Unrealized Losses	2,676
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Total Unrealized Losses	$ 167

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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