AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands	Dec. 31, 2022 USD ($) Securities	Dec. 31, 2021 USD ($) Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 19,424	$ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	306,799	236,825
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	26,092	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	244,917	0
Total Unrealized Losses	$ 45,516	$ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Securities	266	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| Securities	444	40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| Securities	178	40
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 2,389	$ 88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	48,083	9,674
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,514	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	40,667	0
Total Unrealized Losses	4,903	88
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	12,408	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	201,316	11,165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	165	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	4,411	0
Total Unrealized Losses	12,573	10
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	1,388	2,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	18,331	209,703
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	21,533	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	190,369	0
Total Unrealized Losses	22,921	2,676
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	0	167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	6,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,022	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	7,128	0
Total Unrealized Losses	1,022	$ 167
Auction Rate Preferred Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,342
Total Unrealized Losses	858
Collateralized Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	3,239
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	39,069
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	$ 3,239

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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