Deposits - Summary of Deposits Including Accrued Interest Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amount
Non-interest-bearing accounts	$ 1,377,396	$ 1,151,362
Interest-bearing checking accounts, Amount	2,539,428	2,350,106
Money market deposit accounts	578,147	569,680
Savings accounts	898,174	877,177
Time deposits	935,632	866,244
Total deposits	$ 6,328,777	$ 5,814,569
Weighted Average Cost
Non-interest-bearing accounts	0.00%	0.00%
Interest-bearing checking accounts	0.68%	0.51%
Money market deposit accounts	0.68%	0.66%
Savings accounts	0.13%	0.12%
Time deposits	1.82%	1.50%
Total deposits	0.62%	0.51%