Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months	$ 142,900	$ 63,957
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	125,631	199,479
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	268,531	263,436
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	193	196
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	1,364	3,121
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	1,557	3,317
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	3,092	3,052
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	26,938	32,080
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	30,030	35,132
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	1	6
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	57	332
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	58	338
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	139,808	60,541
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer	98,693	167,213
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	238,501	227,754
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	192	189
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer	1,307	2,787
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ 1,499	2,976
Mortgage-backed - Agency
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months		364
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer		186
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total		550
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		1
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer		2
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total		$ 3

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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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Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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

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