Non-interest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Non-interest income	$ 223,032
Revenues out of scope of Topic 606	57,061
Total non-interest income	280,093	$ 345,327	$ 273,194
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	80,840	81,419	83,246
Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	54,685	50,485	46,594
Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	42,503	39,376	39,302
Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	36,567	$ 29,705	$ 27,028
Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	5,410
Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	3,027
Community Banking
Disaggregation of Revenue [Line Items]
Non-interest income	23,467
Revenues out of scope of Topic 606	9,098
Total non-interest income	32,565
Community Banking | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	22,633
Community Banking | Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Community Banking | Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	834
Community Banking | Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Community Banking | Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Community Banking | Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Corporate Banking
Disaggregation of Revenue [Line Items]
Non-interest income	1,932
Revenues out of scope of Topic 606	7,598
Total non-interest income	9,530
Corporate Banking | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	1,932
Corporate Banking | Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Corporate Banking | Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Corporate Banking | Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Corporate Banking | Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Corporate Banking | Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Retail Banking
Disaggregation of Revenue [Line Items]
Non-interest income	97,735
Revenues out of scope of Topic 606	6,656
Total non-interest income	104,391
Retail Banking | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	54,123
Retail Banking | Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Retail Banking | Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	41,669
Retail Banking | Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Retail Banking | Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Retail Banking | Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	1,943
Financial Management Services
Disaggregation of Revenue [Line Items]
Non-interest income	96,662
Revenues out of scope of Topic 606	22,786
Total non-interest income	119,448
Financial Management Services | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	0
Financial Management Services | Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	54,685
Financial Management Services | Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Financial Management Services | Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	36,567
Financial Management Services | Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	5,410
Financial Management Services | Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Other
Disaggregation of Revenue [Line Items]
Non-interest income	3,236
Revenues out of scope of Topic 606	10,923
Total non-interest income	14,159
Other | Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income	2,152
Other | Fiduciary and asset management fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Other | Card fees
Disaggregation of Revenue [Line Items]
Non-interest income	0
Other | Brokerage revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Other | Insurance revenue
Disaggregation of Revenue [Line Items]
Non-interest income	0
Other | Other fees
Disaggregation of Revenue [Line Items]
Non-interest income	$ 1,084