Deposits - Summary of Deposit Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Interest and Noninterest Bearing Domestic Deposit Liabilities To Deposit Liabilities [Abstract]
Noninterest-bearing demand	$ 1,683,887	$ 1,510,224
Interest-bearing checking	2,088,282	2,057,052
Money market	1,468,822	1,225,890
Savings	641,605	584,361
Certificates of deposit $250 thousand and under	685,583	895,056
Certificates of deposit over $250 thousand	146,856	183,200
Deposits	$ 6,715,035	$ 6,455,783
Percentage Of Interest and Noninterest Bearing Domestic Deposit Liabilities To Deposit Liabilities [Abstract]
Noninterest-bearing demand	25.10%	23.40%
Interest-bearing checking	31.10%	31.90%
Money market	21.90%	19.00%
Savings	9.50%	9.10%
Certificates of deposit $250 thousand and under	10.20%	13.80%
Certificates of deposit over $250 thousand	2.20%	2.80%
Total deposits	100.00%	100.00%