Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 15,804,000	$ 13,280,000
Other sources of noninterest income	38,245,000	28,851,000
Total noninterest income	54,049,000	42,131,000
Contract with Customer, Asset, Gross, Noncurrent	0		$ 0
Contract with Customer, Liability, Noncurrent	0		$ 0
Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,459,000	9,699,000
Other sources of noninterest income	4,943,000	4,073,000
Total noninterest income	16,402,000	13,772,000
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,339,000	3,565,000
Other sources of noninterest income	28,117,000	20,979,000
Total noninterest income	32,456,000	24,544,000
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,000	16,000
Other sources of noninterest income	5,185,000	3,799,000
Total noninterest income	5,191,000	3,815,000
Deposit service charges and related fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,349,000	8,523,000
Deposit service charges and related fee income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,544,000	5,233,000
Deposit service charges and related fee income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,799,000	3,274,000
Deposit service charges and related fee income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,000	16,000
Card income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,098,000	945,000
Card income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	898,000	760,000
Card income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	200,000	185,000
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	5,357,000	3,812,000
Wealth management fees | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,017,000	3,706,000
Wealth management fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	340,000	106,000
Wealth management fees | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0