Regulatory Capital Requirements - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Apr. 18, 2019	Aug. 06, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shelf registration shares after amendment	1,500,000
Maximum stock issuable under stock purchase and dividend reinvestment plan	$ 120,000
The 2015 Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of shares authorized to be repurchased (in shares)				1,200,000
Stock repurchased during period (in shares)		40,016
Average price of stock repurchased (in dollars per share)		$ 38.12
The 2019 Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of shares authorized to be repurchased (in shares)			1,000,000
Stock repurchased during period (in shares)	207,201	82,767
Average price of stock repurchased (in dollars per share)	$ 34.99	$ 36.22
Remaining number of shares authorized to be repurchased (in shares)	710,032
Maximum | The 2015 Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Authorized amount to be repurchased				$ 40,000,000
Maximum | The 2019 Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Authorized amount to be repurchased	$ 34,800,000		$ 45,000,000
Dividend Reinvestment and Share Purchase Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock issued during period, shares	0