Debt Securities Held to Maturity - Continuous Unrealized Loss Position on Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value
Less Than 12 Months	$ 359,187	$ 123,147
12 Months or Longer	24,502	0
Total	383,689	123,147
Gross Unrealized (Losses)
Less Than 12 Months	(17,786)	(1,686)
12 Months or Longer	(2,400)	0
Total	(20,186)	(1,686)
U.S. government and agency obligations
Fair Value
Less Than 12 Months	23,132	44,111
12 Months or Longer	18,381	0
Total	41,513	44,111
Gross Unrealized (Losses)
Less Than 12 Months	(1,743)	(759)
12 Months or Longer	(1,615)	0
Total	(3,358)	(759)
Mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	336,055	79,036
12 Months or Longer	6,121	0
Total	342,176	79,036
Gross Unrealized (Losses)
Less Than 12 Months	(16,043)	(927)
12 Months or Longer	(785)	0
Total	$ (16,828)	$ (927)