Deposits - Composition of Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Non-interest-bearing demand deposits	$ 1,290,896	$ 1,279,641
Interest-bearing checking accounts	355,678	338,185
Money market demand accounts	1,104,276	881,387
Other savings	486,131	475,839
Time deposits (below $250,000)	800,759	916,723
Time deposits ($250,000 and above)	201,096	255,802
Total deposits	$ 4,238,836	$ 4,147,577