Investment Securities - Securities in a Gross Unrealized Loss Position - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		$ 217,505
Fair Value, 12 Months or Longer	$ 169,084	140,071
Fair Value	169,084	357,576
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(13,763)
Gross Unrealized Losses, 12 Months or Longer	(21,701)	(22,874)
Gross Unrealized Losses	(21,701)	(36,637)
U.S Treasuries
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		31,261
Fair Value, 12 Months or Longer	42,194	27,949
Fair Value	42,194	59,210
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(1,194)
Gross Unrealized Losses, 12 Months or Longer	(2,571)	(3,076)
Gross Unrealized Losses	(2,571)	(4,270)
U.S. government and federal agencies
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		16,107
Fair Value, 12 Months or Longer	12,881	18,653
Fair Value	12,881	34,760
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(1,078)
Gross Unrealized Losses, 12 Months or Longer	(940)	(2,910)
Gross Unrealized Losses	(940)	(3,988)
Corporate bonds
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		2,614
Fair Value, 12 Months or Longer	2,406
Fair Value	2,406	2,614
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(386)
Gross Unrealized Losses, 12 Months or Longer	(594)
Gross Unrealized Losses	(594)	(386)
Collateralized mortgage obligations
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		16,746
Fair Value, 12 Months or Longer	33,522	21,728
Fair Value	33,522	38,474
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(1,143)
Gross Unrealized Losses, 12 Months or Longer	(7,964)	(5,115)
Gross Unrealized Losses	(7,964)	(6,258)
Tax-exempt municipal
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		4,645
Fair Value, 12 Months or Longer	1,156
Fair Value	1,156	4,645
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(348)
Gross Unrealized Losses, 12 Months or Longer	(224)
Gross Unrealized Losses	(224)	(348)
Taxable municipal
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		337
Fair Value, 12 Months or Longer	580	242
Fair Value	580	579
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(2)
Gross Unrealized Losses, 12 Months or Longer	(27)	(27)
Gross Unrealized Losses	(27)	(29)
Mortgage-backed
Available-for-Sale, Fair Value
Fair Value, Less than 12 Months		145,795
Fair Value, 12 Months or Longer	76,345	71,499
Fair Value	76,345	217,294
Gross Unrealized Losses
Gross Unrealized Losses, Less than 12 Months		(9,612)
Gross Unrealized Losses, 12 Months or Longer	(9,381)	(11,746)
Gross Unrealized Losses	$ (9,381)	$ (21,358)

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