Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	$ 97,497	$ 247,165
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	209,936	24,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	307,433	271,971
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	3,570	1,866
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	12,046	172
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	15,616	2,038
Treasury notes
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	34,357	7,957
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	1,955
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	36,312	7,957
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	931	27
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	45
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	976	27
Federal agencies
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	62,372	238,489
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	207,981	24,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	270,353	263,295
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	2,628	1,503
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	12,001	172
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	14,629	1,675
Mortgage-backed - Government-sponsored entity (GSE)
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	768	719
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	768	719
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months	11	336
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ 11	$ 336