Deposits - Components of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amount
Noninterest demand deposits	$ 1,446,502	$ 1,362,268
Interest bearing demand deposits	1,348,817	1,317,513
Money market accounts	753,684	765,316
Savings accounts	509,095	520,413
Total non-maturity deposits	4,058,098	3,965,510
Certificate of deposit accounts	524,578	466,892
Total deposits	$ 4,582,676	$ 4,432,402
Percent
Noninterest demand deposits (as a percent)	31.60%	30.70%
Interest bearing demand deposits (as a percent)	29.40%	29.70%
Money market accounts (as a percent)	16.40%	17.30%
Savings accounts (as a percent)	11.20%	11.80%
Total non-maturity deposits (as a percent)	88.60%	89.50%
Certificate of deposit accounts (as a percent)	11.40%	10.50%
Total deposits (as a percent)	100.00%	100.00%