Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 13,453,000	$ 13,383,000
Other sources of noninterest income	28,678,000	61,061,000
Total noninterest income	42,131,000	74,444,000
Contract with customer, asset, net	0		$ 0
Contracts with customers, receivables, net	0		$ 0
Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,872,000	9,880,000
Other sources of noninterest income	3,900,000	34,568,000
Total noninterest income	13,772,000	44,448,000
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,565,000	3,345,000
Other sources of noninterest income	20,979,000	24,093,000
Total noninterest income	24,544,000	27,438,000
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16,000	158,000
Other sources of noninterest income	3,799,000	2,400,000
Total noninterest income	3,815,000	2,558,000
Deposit service charges and related fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,523,000	9,186,000
Deposit service charges and related fee income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,233,000	6,014,000
Deposit service charges and related fee income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,274,000	3,014,000
Deposit service charges and related fee income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16,000	158,000
Card income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,118,000	1,244,000
Card income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	933,000	1,070,000
Card income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	185,000	174,000
Card income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,812,000	2,953,000
Wealth management fees | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,706,000	2,796,000
Wealth management fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	106,000	157,000
Wealth management fees | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0