Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									$ 28,330	$ 26,819
Non-interest income not in scope of ASC 606									13,783	11,357
Total non-interest income	$ 11,948	$ 10,739	$ 10,037	$ 9,389	$ 9,479	$ 10,392	$ 9,501	$ 8,804	42,113	38,176	$ 38,599
Cash rewards									554	438
Debit card income
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									9,701	9,067
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									8,393	8,253
Income from fiduciary services
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									5,901	5,376
Brokerage and insurance commissions
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									2,625	2,615
Other income
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									$ 1,710	$ 1,508