Deposits Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits [Abstract]
Demand and other noninterest-bearing	$ 8,856,714	$ 6,913,214
Money market	3,525,299	2,780,922
Interest-bearing demand	1,999,407	1,433,083
Savings	1,617,546	1,169,721
Interest-bearing public funds, other than certificates of deposit	779,146	656,273
Certificates of deposit, less than $250,000	249,120	201,805
Certificates of deposit, $250,000 or more	160,490	108,935
Certificates of deposit insured by CDARS®	35,611	23,105
Brokered certificates of deposit	0	5,000
Reciprocal money market accounts	786,046	577,804
Subtotal	18,009,379	13,869,862
Deposits, Valuation Adjustment From Acquisition Accounting	736	0
Total deposits	$ 18,010,115	$ 13,869,862