Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Noninterest income	$ 38,164	$ 38,018	$ 63,021	$ 78,572
Noninterest expense	111,003	104,561	220,018	206,171
Noninterest income from contracts with customers within the scope of ASC 606
Disaggregation of Revenue [Line Items]
Noninterest income	5,551	7,119	11,065	14,764
Service charges and fees on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income	2,986	4,462	5,983	8,925
Wealth management revenue
Disaggregation of Revenue [Line Items]
Noninterest income	1,321	1,268	2,621	2,052
Other charges and fees for customer services
Disaggregation of Revenue [Line Items]
Noninterest income	1,244	1,389	2,461	3,787
Noninterest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Noninterest income	32,613	30,899	51,956	63,808
Other
Disaggregation of Revenue [Line Items]
Noninterest expense	$ 810	$ 38	$ 1,536	$ 684