Debt Securities Held to Maturity - Continuous Unrealized Loss Position on Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months	$ 18,890	$ 280,063
12 Months or Longer	345,221	90,328
Total	364,111	370,391
Gross Unrealized (Losses)
Less Than 12 Months	(1,230)	(33,044)
12 Months or Longer	(49,992)	(18,088)
Total	(51,222)	(51,132)
U.S. government and agency obligations
Fair Value
Less Than 12 Months	4,918	4,956
12 Months or Longer	37,917	37,611
Total	42,835	42,567
Gross Unrealized (Losses)
Less Than 12 Months	(82)	(44)
12 Months or Longer	(6,954)	(7,260)
Total	(7,036)	(7,304)
Mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	13,972	275,107
12 Months or Longer	307,304	52,717
Total	321,276	327,824
Gross Unrealized (Losses)
Less Than 12 Months	(1,148)	(33,000)
12 Months or Longer	(43,038)	(10,828)
Total	$ (44,186)	$ (43,828)