Revenue from Contracts with Customers - Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 38,180	$ 33,526
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	279	316
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,857	8,265
Administrative services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,061	1,024
Card related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,139	1,415
Other deposit related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,858	2,358
Wealth management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	22,986	20,148
Wealth management | Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6,031	6,220
Wealth management | Trust
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,417	3,308
Wealth management | Asset management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 13,538	$ 10,620