Deposits - Summary of Deposit Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Interest and Noninterest Bearing Domestic Deposit Liabilities To Deposit Liabilities [Abstract]
Noninterest-bearing demand	$ 1,857,324	$ 2,113,289
Interest-bearing checking	3,118,189	3,079,249
Money market	1,014,116	1,192,353
Savings	729,941	974,403
Certificates of deposit $250 thousand and under	1,401,588	901,505
Certificates of deposit over $250 thousand	481,345	306,672
Deposits	$ 8,602,503	$ 8,567,471
Percentage Of Interest and Noninterest Bearing Domestic Deposit Liabilities To Deposit Liabilities [Abstract]
Noninterest-bearing demand	21.60%	24.70%
Interest-bearing checking	36.20%	35.90%
Money market	11.80%	13.90%
Savings	8.50%	11.40%
Certificates of deposit $250 thousand and under	16.30%	10.50%
Certificates of deposit over $250 thousand	5.60%	3.60%
Total deposits	100.00%	100.00%