Securities - Unrealized Loss on Available for Sale Securities (Details) $ in Thousands	Jun. 30, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	346	72
Less Than 12 Months, Estimated Fair Value	$ 881,364	$ 307,285
Less Than 12 Months, Unrealized Loss	$ (58,780)	$ (2,870)
12 Months or More, Number of Securities | contract	145	131
12 Months or More, Estimated Fair Value	$ 149,686	$ 87,921
12 Months or More, Unrealized Loss	(15,097)	(2,867)
Total, Estimated Fair Value	1,031,050	395,206
Total, Unrealized Loss	$ (73,878)	$ (5,737)
U.S. government-sponsored enterprise debt securities (1) (2)
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	214	29
Less Than 12 Months, Estimated Fair Value	$ 358,450	$ 54,562
Less Than 12 Months, Unrealized Loss	$ (20,844)	$ (1,434)
12 Months or More, Number of Securities | contract	59	59
12 Months or More, Estimated Fair Value	$ 27,285	$ 25,526
12 Months or More, Unrealized Loss	(4,442)	(1,004)
Total, Estimated Fair Value	385,735	80,088
Total, Unrealized Loss	$ (25,286)	$ (2,438)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	59	8
Less Than 12 Months, Estimated Fair Value	$ 281,759	$ 52,672
Less Than 12 Months, Unrealized Loss	$ (17,673)	$ (259)
12 Months or More, Number of Securities | contract	3	3
12 Months or More, Estimated Fair Value	$ 9,695	$ 10,286
12 Months or More, Unrealized Loss	(1,264)	(670)
Total, Estimated Fair Value	291,454	62,958
Total, Unrealized Loss	$ (18,937)	$ (929)
U.S. government agency debt securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	68	35
Less Than 12 Months, Estimated Fair Value	$ 233,494	$ 200,051
Less Than 12 Months, Unrealized Loss	$ (20,012)	$ (1,177)
12 Months or More, Number of Securities | contract	83	69
12 Months or More, Estimated Fair Value	$ 112,706	$ 52,109
12 Months or More, Unrealized Loss	(9,391)	(1,193)
Total, Estimated Fair Value	346,200	252,160
Total, Unrealized Loss	$ (29,404)	$ (2,370)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	3
Less Than 12 Months, Estimated Fair Value	$ 1,895
Less Than 12 Months, Unrealized Loss	$ (22)
12 Months or More, Number of Securities | contract	0
12 Months or More, Estimated Fair Value	$ 0
12 Months or More, Unrealized Loss	0
Total, Estimated Fair Value	1,895
Total, Unrealized Loss	$ (22)
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	1
Less Than 12 Months, Estimated Fair Value	$ 991
Less Than 12 Months, Unrealized Loss	$ (4)
12 Months or More, Number of Securities | contract	0
12 Months or More, Estimated Fair Value	$ 0
12 Months or More, Unrealized Loss	0
Total, Estimated Fair Value	991
Total, Unrealized Loss	$ (4)
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Number of Securities | contract	1
Less Than 12 Months, Estimated Fair Value	$ 4,775
Less Than 12 Months, Unrealized Loss	$ (225)
12 Months or More, Number of Securities | contract	0
12 Months or More, Estimated Fair Value	$ 0
12 Months or More, Unrealized Loss	0
Total, Estimated Fair Value	4,775
Total, Unrealized Loss	$ (225)