Acquisition of RSI Communities - Summary of Unaudited Pro Forma Amounts of RSI Communities Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
South Pacific Financial Corporation
Business Acquisition [Line Items]
Operating revenues	$ 466,889	$ 534,704	$ 1,388,222	$ 1,427,524
Net income available to common stockholders	$ 9,480	$ 26,900	$ 26,627	$ 58,160
Income per share - basic (in USD per share)	$ 0.25	$ 0.71	$ 0.71	$ 1.53
Income per share - diluted (in USD per share)	$ 0.24	$ 0.69	$ 0.68	$ 1.47
RSI Communities
Business Acquisition [Line Items]
Operating revenues		$ 534,704		$ 1,467,959
Net income available to common stockholders		$ 26,558		$ 57,143
Income per share - basic (in USD per share)		$ 0.70		$ 1.51
Income per share - diluted (in USD per share)		$ 0.68		$ 1.44