Securities - Schedule of Available for Sale Securities with Unrealized Losses (Details) $ in Thousands	Sep. 30, 2023 USD ($) contract	Dec. 31, 2022 USD ($) contract
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	90	397
Less than 12 months, estimated fair value	$ 140,277	$ 592,593
Less than 12 months, unrealized loss	$ (4,701)	$ (40,967)
12 months or more, number of securities | contract	560	226
12 months or more, estimated fair value	$ 868,629	$ 409,844
12 months or more, unrealized loss	(140,025)	(72,014)
Total, estimated fair value	1,008,906	1,002,437
Total, unrealized loss	$ (144,726)	$ (112,981)
U.S. government-sponsored enterprise debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	52	250
Less than 12 months, estimated fair value	$ 79,491	$ 292,595
Less than 12 months, unrealized loss	$ (3,063)	$ (22,315)
12 months or more, number of securities | contract	335	108
12 months or more, estimated fair value	$ 333,171	$ 96,986
12 months or more, unrealized loss	(55,375)	(21,351)
Total, estimated fair value	412,662	389,581
Total, unrealized loss	$ (58,438)	$ (43,666)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	6	50
Less than 12 months, estimated fair value	$ 13,242	$ 203,516
Less than 12 months, unrealized loss	$ (673)	$ (13,374)
12 months or more, number of securities | contract	55	14
12 months or more, estimated fair value	$ 239,336	$ 72,190
12 months or more, unrealized loss	(32,119)	(12,825)
Total, estimated fair value	252,578	275,706
Total, unrealized loss	$ (32,792)	$ (26,199)
U.S. government agency debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	30	92
Less than 12 months, estimated fair value	$ 43,592	$ 88,056
Less than 12 months, unrealized loss	$ (941)	$ (4,976)
12 months or more, number of securities | contract	167	104
12 months or more, estimated fair value	$ 294,482	$ 240,668
12 months or more, unrealized loss	(52,439)	(37,838)
Total, estimated fair value	338,074	328,724
Total, unrealized loss	$ (53,380)	$ (42,814)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	0	3
Less than 12 months, estimated fair value	$ 0	$ 1,656
Less than 12 months, unrealized loss	$ 0	$ (75)
12 months or more, number of securities | contract	3	0
12 months or more, estimated fair value	$ 1,640	$ 0
12 months or more, unrealized loss	(92)	0
Total, estimated fair value	1,640	1,656
Total, unrealized loss	$ (92)	$ (75)
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, number of securities | contract	2	1
Less than 12 months, estimated fair value	$ 3,952	$ 1,996
Less than 12 months, unrealized loss	$ (24)	$ (1)
12 months or more, number of securities | contract	0	0
12 months or more, estimated fair value	$ 0	$ 0
12 months or more, unrealized loss	0	0
Total, estimated fair value	3,952	1,996
Total, unrealized loss	$ (24)	$ (1)
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		$ 4,774
Less than 12 months, unrealized loss		$ (226)
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		4,774
Total, unrealized loss		$ (226)