Deposits - Deposit Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Banking and Thrift, Interest [Abstract]
Non-interest checking		$ 1,164,908	$ 794,583
Interest-bearing checking		599,630	467,988
Savings		256,347	203,236
Money market		1,210,414	1,009,972
CDs $250,000 or less		176,895	220,751
CDs greater than $250,000		68,074	90,200
Total customer deposits		3,476,268	2,786,730
Brokered deposits	[1]	74,995	0
Total deposits		$ 3,551,263	$ 2,786,730

[1] Brokered CDs which are individually $250,000 and under