Acquisition of South Pacific Financial Corporation - Summary of Assets and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 08, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Receivables	$ 12,569		$ 13,502
Goodwill	123,695		123,695
Other assets	35,136		36,971
Total assets	3,019,004		2,929,774
Accounts payable	114,810		128,371
Accrued expenses	102,263		150,155
Total liabilities	$ 1,986,641		$ 1,915,447
South Pacific Financial Corporation
Business Acquisition [Line Items]
Receivables		$ 1,908
Mortgages held for sale		17,597
Derivative portfolio		1,519
Goodwill		4,500
Other assets		1,426
Total assets		26,950
Accounts payable		206
Accrued expenses		3,053
Warehouse facilities		14,791
Total liabilities		18,050
Net assets acquired		$ 8,900