Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									$ 27,736	$ 28,330	$ 26,819
Total non-interest income not in scope of ASC 606									22,754	13,783	11,357
Total non-interest income	$ 14,331	$ 12,696	$ 12,060	$ 11,403	$ 11,948	$ 10,739	$ 10,037	$ 9,389	50,490	42,113	38,176
Cash rewards									603	554	438
Debit card income
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									10,420	9,701	9,067
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									6,697	8,393	8,253
Income from fiduciary services
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									6,115	5,901	5,376
Brokerage and insurance commissions
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									2,832	2,625	2,615
Other income
Disaggregation of Revenue [Line Items]
Non-interest income within the scope of ASC 606									$ 1,672	$ 1,710	$ 1,508