Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Noninterest income	$ 24,857	$ 40,554
Noninterest expense	(109,015)	(101,610)
Noninterest income from contracts with customers within the scope of ASC 606
Disaggregation of Revenue [Line Items]
Noninterest income	5,514	7,645
Service charges and fees on deposit accounts
Disaggregation of Revenue [Line Items]
Noninterest income	2,997	4,463
Wealth management revenue
Disaggregation of Revenue [Line Items]
Noninterest income	1,300	784
Other charges and fees for customer services
Disaggregation of Revenue [Line Items]
Noninterest income	1,217	2,398
Noninterest income within the scope of other GAAP topics
Disaggregation of Revenue [Line Items]
Noninterest income	19,343	32,909
Other
Disaggregation of Revenue [Line Items]
Noninterest expense	$ (726)	$ (722)